JP2008077780A - Recording apparatus, recording method and recording program, recording / reproducing apparatus, recording / reproducing method, recording / reproducing program, and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to continue data recording even when a recording error occurs due to vibration, impact, drop or the like when recording on a hard disk or the like, and to prevent the recording data from being lost when the recording error occurs. .
When data is being recorded on a hard disk, if the recording process times out due to vibration, impact, drop, etc. and a recording error occurs, the data recording destination is switched from the hard disk to the non-volatile memory, and data recording continues. Is done. Data written to the nonvolatile memory is written back to the hard disk at a predetermined timing, for example, when the hard disk is played back. When the write-back is successful, the written-back data in the nonvolatile memory is deleted.
[Selection] Figure 7

Description

  According to the present invention, when a recording error occurs due to a drop, vibration, impact, or the like on a randomly accessible disk-shaped recording medium such as a hard disk, the recording process can be continued and recording data is not lost due to the recording error. The present invention relates to a recording apparatus, a recording method and a recording program, a recording / reproducing apparatus, a recording / reproducing method, a recording / reproducing program, and an imaging apparatus.

  A hard disk, which is one of random-accessible disk-shaped recording media, has been widely used as a recording medium for computer devices and the like because of its large recording capacity and high access speed. In recent years, with the miniaturization and increase in capacity of hard disks, the demand for recording media such as portable video cameras and audio devices has also increased significantly.

  Generally, in a hard disk, the head is brought close to the disk surface, the disk is rotated at a high speed and the head is moved in the radial direction of the disk to access the address on the disk, and data recording to the disk is performed. Play data recorded on the disc.

  Since hard disks are accessed mechanically, access errors may occur due to dropping, vibration, and shock. In other words, if a predetermined amount of vibration, shock, or acceleration is applied to the hard disk being accessed, the head may become inaccessible due to, for example, the head moving away from the disk surface by a predetermined distance or contacting the head and the disk. The head and / or the disk may be damaged. For example, a sensor for detecting vibration or the like is provided in a hard disk device, and when a predetermined amount or more of vibration is detected, recording / reproduction is stopped and the head is moved to a safe area. Others try to avoid disc damage.

  If an access error occurs during reproduction, data reproduction is interrupted. Therefore, conventionally, when playing back data recorded on the hard disk, if the playback of data from the hard disk is interrupted by pre-reading and buffering a predetermined amount of data to be played back from the hard disk It was done to deal with. For example, in the case of video data, the video data recorded on the hard disk is prefetched from the hard disk up to a predetermined time ahead of the reproduction time and stored in the memory.

Also, access to the hard disk may be interrupted by the seek operation of the head. In Patent Document 1, in order to avoid a reproduction interruption that occurs during a seek operation, a predetermined amount of data is held in a memory by a predetermined amount of data at a location where access by seek is required, and a seek is performed from a disc-shaped recording medium. A technique is described in which data held in this memory is output during a period in which data reproduction is difficult.
JP 2003-125358 A

  Here, consider a case in which temporally continuous stream data such as video data and audio data supplied in substantially real time is recorded on a hard disk. During recording, a recording error may occur if a certain amount of vibration or impact is applied to the hard disk during recording, as in playback. Conventionally, when a recording error occurs during recording, recording has to be stopped, and there has been a problem that there has been no method for restoring data that could not be recorded due to the error.

  In particular, when a hard disk is used as a recording medium for a portable video camera, if the recording stops due to dropping, vibration, impact, etc., the shooting itself will be interrupted at that point until the shooting is resumed. There was a problem of missing a precious photo opportunity between the two.

  In addition, when the shooting is interrupted, data shot at a unique shooting timing is lost, and there is a problem as a function of the video camera.

  During recording, if the disc-shaped recording medium is unrecorded or has a sufficient free space, data can be recorded at consecutive addresses on the medium, and a problem due to seek is unlikely to occur. It is considered a thing.

  Accordingly, an object of the present invention is to continue recording data even when a recording error occurs due to dropping, vibration, impact, etc. when using a disk-shaped recording medium such as a hard disk, and to record data when a recording error occurs. It is an object to provide a recording apparatus, a recording method and a recording program, a recording / reproducing apparatus, a recording / reproducing method, a recording / reproducing program, and an imaging apparatus that can prevent loss of image data.

  In order to solve the above-described problems, a first invention provides a recording apparatus for recording data on a disk-shaped recording medium, a recording unit for writing the requested data to the disk-shaped recording medium, and writing to the disk-shaped recording medium A determination unit that determines whether or not the requested data is normally written; and a control unit that controls writing of data to the disk-shaped recording medium by the recording unit. When it is determined that the requested data cannot be written normally, the requested data is written to a non-volatile storage medium, and management information for the requested data is created and retained. This is a recording apparatus.

  According to a second aspect of the present invention, in a recording method for recording data on a disk-shaped recording medium, a recording step of writing the data requested to be written to the disk-shaped recording medium, and writing of the data requested to be written to the disk-shaped recording medium A determination step for determining whether or not the recording is normally performed, and a control step for controlling the writing of data to the disc-shaped recording medium by the recording step. The control step is a write request according to the determination step. When it is determined that writing of the requested data is not performed normally, the requested data is written to the nonvolatile storage medium, and management information of the requested data is created and maintained. Is a recording method characterized by the above.

  According to a third aspect of the present invention, there is provided a recording program for causing a computer apparatus to execute a recording method for recording data on a disk-shaped recording medium. The recording method includes a recording step of writing data requested to be written to the disk-shaped recording medium; A determination step for determining whether or not the data requested to be written to the disk-shaped recording medium is normally written, and a control step for controlling the data writing to the disk-shaped recording medium in the recording step. The control step writes the write-requested data to the nonvolatile storage medium and the write-requested data when it is determined that the write-requested data is not normally written by the determination step. A recording method for creating and storing management information for a computer A recording program for causing executed.

  According to a fourth aspect of the present invention, there is provided a recording / reproducing apparatus for recording data on a disk-shaped recording medium and reproducing the data from the disk-shaped recording medium, a recording unit for writing the requested data to the disk-shaped recording medium, A reproducing unit that reproduces data written on a recording medium based on a read request, a determination unit that determines whether or not the data requested to be written to the disc-shaped recording medium is normally written, and a disc-like unit by the recording unit A controller that controls the writing of data to the recording medium and the reproduction of data from the disk-shaped recording medium by the reproducing unit, and the control unit normally writes the data requested to be written by the judging unit. If it is determined that the data is not written, the requested write data is written to the non-volatile storage medium and the write request is issued. A recording and reproducing apparatus being characterized in that creates management information of the data so as to retain.

  According to a fifth aspect of the present invention, there is provided a recording / reproducing method for recording data on a disk-shaped recording medium and reproducing the data from the disk-shaped recording medium. A reproduction step for reproducing the data written on the recording medium based on the read request, a determination step for determining whether or not the writing of the requested data to the disk recording medium is performed normally, and a recording step A step of controlling data writing to the disk-shaped recording medium by the step and a step of controlling data reproduction from the disk-shaped recording medium by the step of reproducing, the control step being requested to be written by the step of judging When it is determined that data writing is not performed normally, a write request is issued. And writes to the nonvolatile storage medium data, a recording and reproducing method is characterized in that so as to retain creates management information of the write requested data.

  According to a sixth aspect of the present invention, there is provided a recording / reproducing program for causing a computer apparatus to execute a recording / reproducing method for recording data on a disk-shaped recording medium and reproducing the data from the disk-shaped recording medium. The recording step for writing data to the disk-shaped recording medium, the reproduction step for reproducing the data written on the disk-shaped recording medium based on the read request, and the writing of the requested data to the disk-shaped recording medium are performed normally. A determination step for determining whether or not the recording is performed, and a control step for controlling data writing to the disk-shaped recording medium by the recording step and data reproduction from the disk-shaped recording medium by the reproducing step. In the control step, the data requested to be written by the decision step A recording / reproducing method for writing data requested to be written to a nonvolatile storage medium and creating and maintaining management information for the data requested to be written when it is determined that the writing of the data is not normally performed. A recording / reproducing program executed by a computer device.

  According to a seventh aspect of the present invention, there is provided an imaging apparatus for recording video data obtained by imaging an object by an imaging unit on a disk-shaped recording medium and reproducing the video data from the disk-shaped recording medium. An imaging unit that outputs data, a recording unit that writes video data requested to be written to a disk-shaped recording medium, a reproducing unit that reproduces video data written to the disk-shaped recording medium based on a read request, and a disk-shaped recording medium A determination unit that determines whether or not the video data requested to be written is normally written, writing of video data to the disk-shaped recording medium by the recording unit, and video data from the disk-shaped recording medium by the reproducing unit A control unit for controlling reproduction, and the control unit is configured to store the video data requested to be written by the determination unit. When it is determined that the writing is not normally performed, the write requested data is written to a non-volatile storage medium, and the management information of the requested video data is created and held. It is an imaging device.

  As described above, the present invention determines whether or not the write-requested data is normally written when the write-requested data is written to the disc-shaped recording medium, and the write request is made based on the determination result. When it is determined that the written data is not normally written, the write requested data is written to the nonvolatile storage medium, and the management information of the requested write data is created and held. Even when the data requested to be written to the disk-shaped recording medium is not normally written, the data writing process according to the write request can be continued.

  As described above, the present invention determines whether or not the data requested to be written is normally written when the data requested to be written is written to the disc-shaped recording medium, and the request for writing is made based on the determination result. When it is determined that the written data is not normally written, the write requested data is written to the nonvolatile storage medium, and the management information of the requested write data is created and held. Even when the data requested to be written to the disk-shaped recording medium is not normally written, there is an effect that the data writing process according to the write request can be continued.

  The first embodiment of the present invention will be described below. In the present invention, for example, when a recording error occurs during recording of data on a disk-shaped recording medium such as a hard disk or when there is a possibility of a recording error, the recording data is stored in another recording medium such as a nonvolatile memory. The recorded data is saved. Further, the recording data stored in the other recording medium is written back to the original writing position on the disc-shaped recording medium at a predetermined timing.

  The recording can be continued even if a recording error occurs due to dropping, vibration, impact, etc. during recording of the recording data on the disk-shaped recording medium, or the recording error may occur. Even if a recording error occurs, the recorded data is not lost. In addition, recording data stored in another recording medium such as a non-volatile memory in association with a recording error is written to a predetermined position of the disk-shaped recording medium later, so that no disk error exists. Recorded data can be reproduced.

  First, in order to facilitate understanding, a file system applicable to the first embodiment of the present invention will be schematically described. In the first embodiment of the present invention, FAT (File Allocation Table) is applied as a file system. The FAT is a file system used in Windows (registered trademark) which is one of OS (Operating System) of a computer apparatus, and is called FAT16 or FAT32 depending on the size of an entry.

  FIG. 1 shows an example of the data structure of a hard disk formatted based on the FAT file system. FIG. 1A shows an example formatted with FAT16. The entire hard disk is designated with a sector number by a logical serial number starting from 0 in an LBA (Logical Block Address) mode. A master boot record (MBR) is arranged in the first sector (LBA = 0) of the hard disk.

  In the master boot record, as shown in FIG. 2 as an example, the activation code and the partition information assigned to the hard disk are described. FIG. 3 shows an example of the structure of a partition table in which partition information is described in the master boot record. In the partition table, an access pointer for a partition is described in a CHS (Cylinder / Head / Secter) mode and an LBA mode. The access pointer is described by a start sector and an end sector in the CHS mode, and is described by a start sector and a partition size in the LBA mode.

  Next to the master boot record, a partition is arranged through a predetermined free area. A partition boot record (PBR) is arranged at the head of the partition, and describes a disk parameter, a program code for reading the first file, and the like. Following the partition boot record, FAT is described. Following the FAT, a root directory entry is described. This root directory entry is an area not managed by the FAT. Next to the root directory entry is a data area, and clusters managed by the FAT are arranged.

A cluster is a collection of 2 ⁿ sectors (n is an integer of 0 or more), and is the smallest unit that can manage data in the FAT. As for the size of one sector, 512 bytes is generally used in the case of a hard disk.

  FIG. 4 shows an exemplary structure of a directory entry in FAT16. In FIG. 4, one scale in the horizontal direction indicates 8 bits. In the directory entry, the file name, extension name, and attribute information are described from the top for one file, and further through the reserved area, the file creation time and creation date, the last access date, the first cluster number ( (High-order side), recording time and date, start cluster number (low-order side), and file size are described. This file information is described for the number of files recorded in the partition to which the directory entry belongs.

  In FAT32, a file name of up to 255 characters can be specified by the VFAT (Virtual FAT) file system. In the VFAT system, the directory entry of FAT16 is expanded, and a directory entry for recording a long file name is provided in addition to a directory entry for holding a file name compatible with the FAT16 file system.

  FIG. 1B shows an example formatted with FAT32. In this case, the difference is that the root directory entry is arranged in the data area and the area FSInfo is placed next to the partition boot record in the example formatted with the FAT16 described above. Yes. In the area FSInfo, empty cluster information is described.

  The FAT file system manages the recording area by using a table in which elements (FAT entries) corresponding to all the clusters assigned to the data area in a one-to-one correspondence are arranged in order. FIG. 5 shows an example of FAT by FAT32. In the FAT 32, as illustrated in FIG. 5A, one entry has a size of 32 bits. In FIG. 5A, a FAT entry is associated with each of the cluster numbers indicated by rows and columns, “RSV” indicates a reserved cluster, and “EOF” indicates that the cluster is the end of the file. The numerical value indicated in hexadecimal notation in the FAT entry represents the cluster number of the next cluster linked to the cluster indicated in the FAT entry.

  In the FAT file system, the first cluster number is acquired based on a directory entry described later, and the file is accessed while referring to the FAT entry based on the first cluster number to find the cluster number of the next cluster to be linked.

  In the example of FIG. 5A, the first file has a cluster number “00000007” as the first cluster number, followed by the cluster number “00000008”, and ends with the cluster number “00000009” (see FIG. 5B). In the second file, the first cluster number is the cluster number “0000000A”, followed by the cluster numbers “0000001F”, “00000025”, “00000031”, and the end of the file is the cluster number “00000030” (see FIG. 5C). . The third file has a cluster number “0000001B” as the first cluster number, followed by the cluster numbers “00000011”, “00000012”, “00000013”, “00000014”, and ends with the cluster number “00000003” ( See FIG. 5D). In the fourth file, the first cluster number is the cluster number “0000002C”, the cluster numbers “0000002D”, “0000002E”, “0000002F”, “00000038”, “00000009”, “0000003A”, and so on. The number “0000003B” is the end of the file (see FIG. 5E).

  FIG. 6 shows an example architecture for realizing the above-described file system. The application unit 10, the file system unit 11, and the device driver unit 12 are programs that operate on a host CPU (Central Processing Unit). The recording medium 13 is hardware such as a hard disk or a nonvolatile memory. The file system unit 11 is included in, for example, an OS (Operating System) operating on the host CPU. The application unit 10 is software that operates on the OS. The OS mediates between the application unit 10 and the recording medium 13 via the device driver unit 12.

  Note that the hard disk is generally used as a hard disk drive (HDD) including a hard disk body that is a recording medium itself and a drive device for driving the hard disk.

  The application unit 10 issues an access request to the recording medium 13 at the file level. This access request is passed to the file system unit 11. The file system unit 11 converts the file level access request passed from the application unit 10 into a cluster level access request based on the FAT file system. For example, the file system unit 11 acquires a cluster number to be accessed by referring to the FAT based on a file level access request, and calculates an LBA from the acquired cluster number. This cluster level access request is transferred to the device driver unit 12 and converted into a sector level access request for actually accessing the recording medium 13. The device driver unit 12 passes the sector level access request to the recording medium 13 via a predetermined interface.

  The access response to the access request is performed in the reverse flow. That is, a response to the sector level access request in the recording medium 13 is returned to the vice driver unit 12 as a sector level access response. For example, in the recording medium 13, a sector level response is returned from the recording medium 13 to the device driver unit 12, such as whether data writing to the sector is successful or data reading from the sector is successful. It is.

  The device driver unit 12 converts the sector level access response into a cluster level access response, for example, an LBA unit access response, and passes the response to the file system unit 11. The file system unit 11 obtains a cluster number based on the LBA, and obtains file information corresponding to the obtained cluster number by referring to the FAT. Based on this file information, a file level access response is returned from the file system unit 11 to the application unit 10.

  Next, a first embodiment of the present invention will be described. According to the present invention, data to be written to a disk-shaped recording medium is stored in a rewritable nonvolatile memory such as a flash memory during a period in which writing of data to the disk-shaped recording medium such as a hard disk is difficult due to dropping, vibration, impact, etc. And holds and saves the recorded data. At the time of reproduction, when data is reproduced from an address corresponding to the hard-to-write period of the disk-shaped recording medium, the corresponding data stored in the nonvolatile memory at the time of recording is reproduced.

  Furthermore, the data stored and saved in the nonvolatile memory is tried to be written back to a predetermined address of the disk-shaped recording medium at a predetermined timing. If the data is successfully written back to the disk-shaped recording medium, the data saved in the nonvolatile memory is deleted from the nonvolatile memory. Thereafter, normal reproduction from the disk-shaped recording medium is possible.

  When data to be written to the disk-shaped recording medium is stored in the nonvolatile memory, the address at which the data is written to the nonvolatile memory is made to correspond to the address of the disk-shaped recording medium, so that the disk-shaped recording medium And non-volatile memory can be recorded or played back, and it can appear that only the disk-shaped recording medium is accessed.

This will be described more specifically with reference to FIG. FIG. 7A shows an example data structure of a hard disk formatted by FAT32, and FIG. 7B shows an example address space of a nonvolatile memory. Even in the nonvolatile memory, one sector is set to 512 bytes in accordance with the hard disk, and data is managed in a cluster unit in which 2 ⁿ sectors are collected.

  In the hard disk, data is written in units of sectors, and when writing to a sector fails, control is performed so that writing to the sector is performed again. If rewriting to the same sector is repeated for a predetermined time or more and writing is not successful, the writing process results in a timeout error and a recording error occurs.

  For example, as illustrated in FIG. 7A, it is assumed that the writing process times out due to a drop, vibration, shock, or the like when data is to be written in the range indicated by the address LBA = X1 to the address LBA = X2. In this case, the data to be written in the range indicated by the address LBA = X1 to LBA = X2 is written in the range of the address LBA = Y1 to the address LBA = Y2 of the nonvolatile memory (FIG. 7B), and the data to be written to the hard disk is written. Save to non-volatile memory.

  At this time, the host system is notified that data has been written in the range of hard disk address LBA = X1 to address LBA = X2. As a result, the next writing to the hard disk is performed from the address LBA = X3, which is the next address after the data is saved in the nonvolatile memory.

  At a predetermined timing, an attempt is made to write back the data written and saved in the nonvolatile memory back to the hard disk. That is, data writing is attempted to an address on the hard disk to be written when data is not saved in the nonvolatile memory to the hard disk. In the example of FIG. 7, data that is requested to be written in the range of address LBA = X1 to address LBA = X2 in the hard disk and saved in the range of address LBA = Y1 to address LBA = Y2 of the non-volatile memory is the address of the hard disk. It is written in the section from LBA = X1 to address LBA = X2. When the data written in the nonvolatile memory is successfully written back to the hard disk, the data in the nonvolatile memory is deleted.

  As another example, the writing process at the time of writing back the data in the range from the address LBA = Y3 to the address LBA = Y4 in the nonvolatile memory to the address LBA = X4 from the address LBA = X3 corresponding to the hard disk failed. In this case, the data on the nonvolatile memory is not deleted. In this case, when accessing data between the address LBA = X3 and the address LBA = X4 in the hard disk, the corresponding address in the nonvolatile memory is accessed.

  Next, the first embodiment of the present invention will be described in more detail. FIG. 8 shows in more detail the configuration of an example of a FAT file system that can be applied to the first embodiment of the present invention. In FIG. 8, the same reference numerals are given to the portions common to FIG. 6 described above, and detailed description thereof is omitted. That is, the application unit 10, the file system unit 11, and the device driver unit 12 in FIG. 8 correspond to the description of FIG.

  The file system unit 11 includes a recording control unit 20 and a recording medium control unit 21, and the recording control unit 20 includes a FAT control unit 22, a cluster control unit 23, and a directory entry control unit 24. The recording medium control unit 21 has a position calculation unit 25.

  Here, two recording media 13A and 13B are used, and the device driver unit 12 has device drivers 12A and 12B corresponding to the recording media 13A and 13B, respectively. As an example, the recording medium 13A is a hard disk, and the recording medium 13B is a non-volatile memory.

  As described above, the hard disk is used as a hard disk drive including a hard disk body that is a recording medium itself and a drive device for driving the hard disk. Similarly, the non-volatile memory includes a non-volatile memory main body as a recording or storage medium itself, and a drive circuit that electrically drives the non-volatile memory.

  The device drivers 12A and 12B are connected to the recording media 13A and 13B via predetermined interfaces, respectively. In this example in which the recording medium 13A is a hard disk, the device driver 12A is connected to the recording medium 13A using, for example, ATA (AT Attachment) as an interface. When the recording media 13A and 13B are connected, the device driver unit 12 acquires information on the respective recording media by the corresponding device drivers 12A and 12B, and mounts the recording media 13A and the recording media 13B in the system.

  For example, when the recording medium 13A that is a hard disk is connected, information necessary for accessing the recording medium 13A is acquired from the recording medium 13A, and the recording medium 13A is mounted in the system. As an example, the MBR is read from the recording medium 13A by the device driver 12A, and the partition information is acquired based on the partition table. Then, FAT and directory entry are read from the partition. In this way, the information on the recording medium 13A is acquired and held in the file system unit 11 as drive information 26, whereby the recording medium 13 is mounted on the system. The drive information 26 is stored and held in a RAM 30 as a work memory of the CPU, for example.

  Similarly, when the recording medium 13B, which is a nonvolatile memory, is connected, information necessary for accessing the recording medium 13B is acquired from the recording medium 13B by the device driver 12B and held in the file system unit 11 as drive information 27 As a result, the recording medium 13B is mounted on the system.

  An example of the operation of the file system unit 11 will be schematically described. When a write request for writing a file to, for example, the recording medium 13A is passed from the application unit 10 to the file system unit 11, the directory entry control unit 24 creates directory entry information of the file to be written based on the write request. At this time, the directory entry control unit 24 requests the FAT control unit 22 for information on a free cluster in which a file can be written. The directory entry control unit 24 passes the leading cluster number at the time of file writing to the cluster control unit 23 based on the free cluster information. The leading cluster number is transferred from the cluster control unit 23 to the position calculation unit 25, and the position calculation unit 25 converts the transferred cluster number into an LBA and passes it to the device driver 12A.

  The recording data transferred from the application unit 10 to the file system unit 11 is first written in the cluster indicated by the head cluster number. Thereafter, the cluster control unit 23 designates the cluster number of the cluster that exchanges data with the position control unit 25 and writes data, and the designated cluster number is converted into LBA by the position calculation unit 25, and the recorded data is stored in the LBA. And the cluster number of the cluster in which the data is written is transferred to the FAT control unit 22 and registered in the FAT.

  Thus, the file unit access request to the recording medium 13 by the application unit 10 is converted into a cluster unit access request by the recording control unit 20 in the file system unit 11 and further converted into LBA by the recording medium control unit 21. The Based on the LBA, the device driver unit 12 generates a command by an interface using a predetermined protocol such as ATA, and supplies the command to the recording medium 13. As a result, the recording medium 13 is accessed in units of sectors.

  For example, when writing data, the device driver unit 12 generates a write command using a predetermined interface, and passes the write command and recording data to the recording medium 13. In this way, recording data is written to the recording medium 13 in units of sectors.

  Actually, a predetermined area of the RAM 30 is secured as a buffer memory, and recording data is temporarily stored in the buffer memory. As an example, the file system unit 11 determines a cluster number for writing record data by referring to the buffer memory, for example, based on a write request from the application unit 10. The device driver unit 12 reads the recording data from the buffer memory and passes it to the recording medium 13 together with the write command.

  FIG. 9 is a flowchart showing an example of recording processing according to the first embodiment of the present invention. Hereinafter, the recording medium 13A in FIG. 8 is referred to as a hard disk, and is described as the hard disk 13A. Further, the recording medium 13B in FIG. 8 is a rewritable nonvolatile memory such as a flash memory, and is called a nonvolatile memory 13B. Assume that the hard disk 13A and the nonvolatile memory 13B are previously mounted in the system. The non-volatile memory 13B can be accessed in advance by the device driver 12B in units of sectors in the same manner as the hard disk 13A, and the file system unit 11 associates and manages LBAs to the sectors. . Note that the size of one sector in the nonvolatile memory 13B is the same as the size of one sector in the hard disk 13A.

  Each process according to this flowchart is executed by the file system unit 11 based on, for example, control of the OS of the system. More specifically, it is executed by the position calculation unit 25 of the file system unit 11. For example, when a file write request is issued by the application unit 10, recording data is stored in the buffer memory in a predetermined manner, and in step S10, a timeout value corresponding to the writing process is set. As the timeout value, for example, several seconds to several tens of seconds are set. The timeout value may be set in advance prior to the recording process.

  In step S11, the recording data for N sectors stored in the buffer is written from the sector indicated by the sector number X of the hard disk 13A.

  For example, the recording data writing process to the hard disk 13A is performed as follows. In response to a file recording request from the application unit 10 to the hard disk 13A, the file system unit 11 creates or acquires file information by referring to the directory entry and writes recording data by referring to the FAT as described above. The cluster number is acquired and the position calculation unit 25 calculates the LBA. The LBA is passed to the device driver 12A, and a write command is generated. The device driver 12A controls the buffer memory to read the recording data in units of sectors, and issues a request to the hard disk 13A to write the recording data sequentially from the sector of the designated sector number.

  In the next step S12, it is determined whether or not the writing to the hard disk 13A is successful. That is, an access response indicating the write result in step S11 is returned from the hard disk 13A to the position calculation unit 25 of the file system unit 11 via the device driver 12A. If it is determined that the writing has succeeded, the process proceeds to step S13, and the fact that the writing has been successful is notified from the file system unit 11 to, for example, the application unit 10 or the OS, and recording processing for N sectors. Is terminated.

  On the other hand, if it is determined in step S12 that writing of N sectors to the hard disk 13A has not been successful, the process proceeds to step S14. In step S14, it is determined whether or not the reason for determining that the writing has failed is a timeout error for the timeout value set in step S10. For example, the reason for the writing failure is notified from the hard disk by a command based on the interface.

  If it is determined in step S14 that the reason why the writing has failed is not a timeout error, the process proceeds to step S20, and the fact that the writing has failed is transferred from the file system unit 11 to a higher level, for example, the application unit 10 or the OS. The recording process for N sectors is completed.

  On the other hand, if it is determined in step S14 that the reason for the write failure is a timeout error, the process proceeds to step S15, and the free capacity of the nonvolatile memory 13B is confirmed. The free capacity of the nonvolatile memory 13B can be acquired based on save information (see FIG. 10B) described later. At this point, the recording data for N sectors stored in the buffer is held in the buffer.

  In the next step S16, the recording data for N sectors determined to have failed to be written in step S12 based on the free capacity information of the nonvolatile memory 13B acquired in step S15 is saved in the nonvolatile memory 13B. It is determined whether or not it is possible. That is, if the non-volatile memory 13B has a free space of N sectors or more, it can be determined that the recording data can be saved. If there is not enough free space in the nonvolatile memory 13B to write data for N sectors, the processing is shifted to step S20 as the writing has failed, and the writing failure is notified to the upper level.

  On the other hand, if it is determined in step S16 that the non-volatile memory 13B has free space of N sectors or more, the process proceeds to step S17, assuming that the recording data for N sectors can be saved. In step S17, the recording data for N sectors held in the buffer is written into the nonvolatile memory 13B for N sectors from the sector indicated by the predetermined sector number Y.

  For example, the file system unit 11 designates the address for writing the recording data for N sectors in the nonvolatile memory 13B to the device driver 12B by LBA, and the recording data for N sectors for which writing to the hard disk 13A has failed. Is read from the buffer and passed to the device driver 12B. The device driver 12B sequentially writes the recording data for N sectors from the sector indicated by the sector number obtained by converting the address given by the LBA into the nonvolatile memory 13B.

  At this time, the position calculation unit 25 designates the address of the nonvolatile memory 13B by LBA on the device driver unit 12 side, and writes the cluster number designated by the cluster control unit 23 on the recording control unit 20 side. Notify as is done. Thus, by controlling the address information in the position calculation unit 25, that is, the recording medium control unit 21, the recording data is written in the nonvolatile memory 13B, and the recording data is recorded in the hard disk 13A as if it is recorded in the upper level. Can show to the side. Thereby, even if it is determined in step S12 that writing has not succeeded due to dropping, vibration, impact, or the like, recording can be continued.

  In step S18, it is determined whether or not the writing of recording data for N sectors to the nonvolatile memory 13B has succeeded. For example, based on a response from the nonvolatile memory 13B to a write request for each sector from the device driver 12B to the nonvolatile memory 13B, it is possible to determine whether the writing is successful. If it is determined that the writing has failed, the process proceeds to step S20 to notify the upper level that writing of the data requested to be written has failed.

  On the other hand, if it is determined in step S18 that the recording data for N sectors has been successfully written to the nonvolatile memory 13B, the process proceeds to step S19. In step S19, information for saving the recording data for N sectors to the nonvolatile memory 13B is created by writing the recording data for N sectors for which writing to the hard disk 13A has failed to the nonvolatile memory 13B. When the save information is created, the process proceeds to step S13, and the host system is notified that the requested data has been successfully written.

  The above-described series of processing from step S10 to step S20 is repeated for each access request unit of the position calculation unit 25. In the above example, when the writing for N sectors is completed, the process is returned to step S10 or step S11, and the recording data for the next N sectors is recorded by the same process. At this time, the value of N indicating the number of sectors may be different for each repetition.

  FIG. 10 shows an example of save information created in step S19. The save information includes the address information (save source information) of the sector that should be originally written to the hard disk 13A of the recording data that has been written to the nonvolatile memory 13B from the hard disk 13A, as illustrated in FIG. A table including entries associated with address information (save destination information) of the sector saved and written in the volatile memory 13B, and the used capacity and / or free capacity of the nonvolatile memory 13B illustrated in FIG. 10B It consists of information indicating.

  Note that the information indicating the used capacity and / or free capacity of the nonvolatile memory 13B in FIG. 10B is acquired based on the capacity in which the data saved from the hard disk 13A is written in the nonvolatile memory 13B, for example. As an example, when the non-volatile memory 13B is used only for writing data saved from the hard disk 13A, the used capacity of the non-volatile memory 13B is in a state where no recorded data is saved from the hard disk 13A. Becomes 0.

  In the save source information, the address information of the hard disk 13A determined to have been unsuccessfully written in step S12 described above is indicated as the start LBA, and the number of sectors in which the write was saved from the hard disk 13A to the nonvolatile memory 13B is indicated. , Shown as sector count. Similarly, for the save destination information, the address at which writing to the nonvolatile memory 13B is started in step S17 described above is indicated as the start LBA, and the number of sectors written to the nonvolatile memory 13B is indicated as the sector count. It is. If all the recorded data of N sectors for which writing has been attempted to the hard disk 13A in step S12 is saved in the nonvolatile memory 13B, the sector counts of the save source information and the save destination information match. become.

  In the example of FIG. 10, one entry of save information includes an entry number having a data length of 2 bytes, a start LBA having a data length of bytes, a sector count having a data length of 4 bytes, and a save source information. The previous information consists of a start LBA having a data length of bytes and a sector count having a data length of 4 bytes, and has a data length of 26 bytes. That is, the capacity of save information consumed for one save recording process is at most 26 bytes.

  The save information shown in FIG. 10A and the information related to the free capacity of the nonvolatile memory 13B shown in FIG. 10B are each held in a rewritable nonvolatile memory. The non-volatile memory that holds the save information and the free space information may be used also as the non-volatile memory 13B for writing the recording data saved from the hard disk 13A, or a memory may be prepared separately. Hereinafter, the memory holding the save information and the free capacity information is referred to as save information holding memory.

  The process of writing the recording data stored in the buffer to the hard disk 13A in step S11 described above is performed according to the control of the cache memory included in the hard disk 13A itself and the hard disk drive including the drive device for driving the hard disk 13A. As illustrated in FIG. 11, three types of processing can be considered.

  That is, generally, a drive hard disk has a cache memory inside, temporarily stores data input / output to / from the hard disk drive in the cache memory, writes data to the cache memory, and reads data from the cache memory. By controlling the timing at a predetermined time, access to the hard disk in the hard disk drive can be apparently uniformized. Further, by using the data stored in the cache memory, it is possible to cope with sector write errors and sector read errors in the hard disk to some extent. The cache memory is controlled by a command from the interface of the hard disk drive such as ATA.

  FIG. 11A shows an example in which the hard disk drive does not have a cache memory or does not control the cache memory. That is, when sector writing is started, the recording data stored in the buffer is simply written for N sectors from the sector indicated by the sector number X of the hard disk 13A (step S100).

  FIG. 11B and FIG. 11C are examples when the cache memory is controlled in the hard disk drive. In the example of FIG. 11B, the recording data stored in the buffer is written for N sectors from the sector indicated by the sector number X of the hard disk 13A (step S101), and is stored in the cache memory in the hard disk drive in the next step S102. Is written to the hard disk 13A in a predetermined manner.

  In the example of FIG. 11C, when sector writing is started, first, the use of the cache memory in the hard disk drive is turned off (step S103), and the recording data input to the hard disk drive is not stored in the cache memory. The recording data input to the hard disk drive is written for N sectors from the sector indicated by the sector number X of the hard disk 13A (step S104). When writing of recording data for N sectors is completed, use of the cache memory in the hard disk drive is turned on (step S105).

  In any of the cases shown in FIG. 11A, FIG. 11B, and FIG. 11C, there is a possibility that the writing process to the hard disk 13A causes a timeout error due to dropping, vibration, impact, or the like. The method for dealing with the timeout error is common to these three cases.

  FIG. 12 shows an example file layout when moving image data files “M2U00001.MPG”, “M2U00002.MPG”, and “M2U00003.MPG” are written to the hard disk 13A. In the example of FIG. 12, a directory entry is written in the cluster indicated by cluster number 3, and information on files “M2U00001.MPG”, “M2U00002.MPG”, and “M2U00003.MPG” is written in the directory entry. .

  For example, the file “M2U00001.MPG” is written in the range from the cluster number 4 to the cluster number X with the top cluster number being the cluster number 4 based on the directory entry information.

  In the next file “M2U00002.MPG”, the first cluster number is set to the cluster number X + 1 based on the directory entry information, and data is sequentially written from the cluster of the cluster number X + 1. In the example of FIG. 12, the cluster indicated by the cluster number X + N and the cluster number X + N + 1 in the file “M2U00002.MPG” is not written due to a time-out error due to dropping, vibration, or impact.

  When a time-out error occurs when writing to the hard disk 13A, the recording destination of the recording data is switched from the hard disk 13A to the nonvolatile memory 13B according to the flowchart of FIG. 10, and the cluster indicated by the cluster number X + N and cluster number X + N + 1 of the hard disk 13A is changed. Recording data to be recorded is saved in the nonvolatile memory 13B. The position calculation unit 25 designates the LBA for the non-volatile memory 13B in the device driver unit 12, and notifies the upper level, for example, the recording control unit 20 that the data is written in the hard disk 13A.

As a result, in the hard disk 13A, data is not recorded in the range from LBA = x ₁ which is the head address of the cluster number X + N to LBA = x ₂ which is the tail address of the cluster number X + N + 1.

  Thereafter, in this example, data is normally written to the hard disk 13A from the next cluster to the terminal cluster (cluster number Y) of the file “M2U00002.MPG”.

  In the first embodiment, the data saved in the nonvolatile memory 13B is written back to the hard disk 13A at a predetermined timing. As a timing to write back the data saved in the nonvolatile memory 13B to the hard disk 13A, for example, (1) the time of reading the data recorded on the hard disk 13A can be considered. Also, (2) writing back at the time of starting or ending the system can be considered. Further, it is conceivable to perform write back when mounting or unmounting the hard disk 13A system.

  For example, when a device equipped with the hard disk 13A is connected to a computer device such as a personal computer with a predetermined interface, the hard disk 13A is mounted on the computer device, so that the hard disk 13A is recognized as an external storage device of the computer device. You can Further, when the system is turned on or turned off, the mounting process and the unmounting process for the system of the hard disk 13A are performed. At the time of this mounting or at the time of unmounting for releasing the mount, writing back to the hard disk 13A is performed. USB (Universal Serial Bus) and IEEE 1394 (Institute Electrical and Electronics Engineers 1394) are conceivable as an interface for connecting a device equipped with the hard disk 13A and a computer device.

  FIGS. 13 and 14 are flowcharts showing an example of the process (1) of writing back the recording data written in the nonvolatile memory 13B to the hard disk 13A when reading data from the hard disk 13A. In FIG. 13 and FIG. 14, the symbols “A” and “B” indicate that the processing shifts to the corresponding symbols.

  Prior to execution of the flowchart, for example, the file name to be read from the hard disk 13A is passed from the application unit 10 to the file system unit 11. The file system unit 11 searches the entry of the file name passed with reference to the directory entry in the recording control unit 20, and acquires the head sector number of the file. The file system unit 11 further refers to the FAT in the recording control unit 20, sequentially acquires the cluster number of the cluster following the cluster of the head cluster number, and generates an access request for reading. As an example, an access request is generated so as to continuously access clusters with consecutive cluster numbers.

  In step S30, the recording medium control unit 21 refers to the save information illustrated in FIG. 10 and checks the LBA requested to be accessed. As a result of the check, in the next step S31, (A) all the LBA data in the range requested to be accessed is saved in the nonvolatile memory 13B, or (B) all the LBA data in the range is not saved. Processing is branched depending on whether the data is written in 13A or (C) part of LBA data in the range is saved in the nonvolatile memory 13B.

  If it is determined in step S31 that all the LBA data in the range requested for access in (A) is saved in the nonvolatile memory 13B, the process proceeds to step S32. In step S32, an access request is made to the nonvolatile memory 13B based on the save information, and data is read from the nonvolatile memory 13B. In the next step S33, an attempt is made to write back the data read from the nonvolatile memory 13B to the hard disk 13A in response to the access request in step S32.

As an example, referring to FIG. 12 described above, when the hard disk 13A is requested to read the cluster having the cluster number X + N and the cluster number X + N + 1, LBA = the leading address of the cluster number X + N of the hard disk 13A based on the save information It can be seen that all data corresponding to the range of LBA = x ₂ which is the end address of cluster number X + N + ₁ from x ₁ is saved in the nonvolatile memory 13B. Based on the save destination information of the save information, the recording medium control unit 21 accesses the device driver 12B so as to access the address on the nonvolatile memory 13B corresponding to the LBA requested to be read from the hard disk 13A. A request is issued (step S32). In response to this request, the device driver 12B reads data from the nonvolatile memory 13B. The read data is transferred to the recording medium control unit 21, and the address information of the nonvolatile memory 13B is converted into the address information of the hard disk 13A and transferred to the upper level.

In step S33, the recording medium control unit 21, the device driver 12A, the data read from the nonvolatile memory 13B in step S32, the address LBA = x ₁ hard disk 13A on the basis of the evacuation source information save information requesting to write to LBA = x _2. In response to this request, the device driver 12A attempts to write data to the hard disk 13A.

  In step S34, it is determined whether or not the writing to the hard disk 13A in step S33 is successful. If it is determined that the writing is successful, the process proceeds to step S35, and the save information is changed in accordance with the amount of the writing that is successful. For example, the corresponding entry in the save information in FIG. 10A is deleted, and the information indicating the used capacity and / or free capacity of the nonvolatile memory 13B in FIG. 10B is changed.

  When the write back of the data written in the nonvolatile memory 13B to the hard disk 13A is successful, the save information is rewritten in this way, and the information regarding the data that has been written back is deleted. Further, the data corresponding to the successful write back on the nonvolatile memory 13B is deleted.

  On the other hand, if it is determined in step S34 that writing to the hard disk 13A has failed due to, for example, a time-out error or other causes, a series of write-back processing is terminated and the save information is retained. In this case, the data requested to be read from the upper level is read from the nonvolatile memory 13B.

  If it is determined in step S31 that all the LBA data in the range in (B) has not been saved and has been written to the hard disk 13A, the process proceeds to step S36. In this case, the hard disk 13A is accessed for reading using the address instructed from the host as it is. Referring to FIG. 12 described above, for example, when a request is made to access the cluster indicated by cluster number 3 and cluster number 4, the data of these clusters are not saved in the nonvolatile memory 13B based on the save information. I understand that. The recording medium control unit 21 calculates the LBA from the cluster number requested to be read from the host and passes it to the device driver 12A.

  If it is determined in step S31 that (C) part of LBA data in the range has been saved in the nonvolatile memory 13B, the process proceeds to step S37 (see FIG. 14). In step S37, the access order of the hard disk 13A and the nonvolatile memory 13B is calculated based on the save information.

For example, with reference to FIG. 12, consider a case in which it is requested to read a range from cluster number X + N-1 to cluster number X + N + 2 from the top. Based on the save information, non-volatility of data in the range from LBA = x ₁ to LBA = x ₂ corresponding to the cluster number X + N to the cluster number X + N + 1 in the requested range from the cluster number X + N−1 to the cluster number X + N + 2. It can be seen that saving to the memory 13B is performed.

  In this example, in step S37, based on the save information, the cluster indicated by the cluster number X + N−1 is first read from the hard disk 13A, and the clusters from the cluster number X + N to the cluster number X + N + 1 are stored in the nonvolatile memory 13B. Read data from the corresponding address. Next, the access order of the hard disk 13A and the nonvolatile memory 13B is determined so that the cluster indicated by the cluster number X + N + 2 is read from the hard disk 13A.

  When making an access request to the hard disk 13A (step S38), the process proceeds to step S39, where an access request to the hard disk 13A is made, and data is read from the hard disk 13A. Then, the process proceeds to step S40, and it is determined whether or not data has been read from all addresses requested to be read. If it is determined that the data has not been read from all the requested addresses, the process returns to step S38, and the next access order address is accessed.

  When data is read from the non-volatile memory 13B (step S38), read access to the non-volatile memory 13B is performed based on the save information (step S41) in the same manner as in the above-described steps S32 to S35. Then, the read data is written back to the hard disk 13A (step S42). If it is determined that the write-back to the hard disk 13A is successful (step S43), the corresponding entry in the save information and the corresponding data in the nonvolatile memory 13B are deleted (step S44). Then, the process proceeds to step S40.

  Next, an example of processing (2) and (3) in which writing back is performed when the hard disk 13A is mounted and unmounted will be described with reference to the flowcharts of FIGS. FIG. 15 shows an example of processing when data written in the nonvolatile memory 13B is written back to the hard disk 13A when the hard disk 13A is mounted on the system. For example, the hard disk 13A is mounted when the apparatus is turned on and the system is activated. In addition, when a device using the hard disk 13A is connected to a computer device through a predetermined interface and the hard disk 13A is used as an external storage device of the computer device, the hard disk 13A can be used again after the interface is disconnected. In this case, the hard disk 13A is mounted.

  For example, when the apparatus is turned on or the interface is disconnected, first, predetermined processing other than processing related to the hard disk 13A is performed (step S50), and then the hard disk 13A is mounted on the system (step S51). In addition, when the interface is disconnected after the device using the hard disk 13A is connected to the computer device with a predetermined interface and the hard disk 13A is used as the external storage device of the computer device, the computer device side in advance It is assumed that the hard disk 13A is unmounted according to a predetermined procedure.

  When the hard disk 13A is mounted on the system, the save information holding memory is referred to, and data written in the nonvolatile memory 13B is written back to the hard disk 13A based on the save information (step S52). Details of the processing in step S52 will be described later. When the data is written back to the hard disk 13A, another predetermined process is performed in step S53.

  FIG. 16 shows an example of processing in the case where data written to the nonvolatile memory 13B is written back to the hard disk 13A when the hard disk 13A is unmounted from the system. For example, the hard disk 13A is unmounted when the apparatus is turned off and the system is stopped. Further, in order to use a device using the hard disk 13A as an external storage device of the computer device, when the device using the hard disk 13A is connected to the computer device through a predetermined interface, the hard disk in the device using the hard disk 13A is used. 13A is unmounted.

  For example, when the apparatus is turned off or connected to the computer apparatus through a predetermined interface, first, unrecorded recording data stored in the hard disk 13A is stored in the buffer memory or the cache memory of the hard disk 13A. 13A is written in a predetermined manner (step S60), and the open file is closed (step S61). Then, the save information holding memory is referred to, and the process of writing back the data written in the nonvolatile memory 13B to the hard disk 13A based on the save information is performed (step S62). When the data is written back to the hard disk 13A, the hard disk 13A is unmounted from the system (step S63), and other predetermined processing is performed.

  FIG. 17 shows an example of processing for writing back the data in the nonvolatile memory 13B to the hard disk 13A in step S52 in FIG. 15 and step S62 in FIG. First, in step S70, information on the used capacity and / or free capacity of the nonvolatile memory 13B held in the save information holding memory is acquired (see FIG. 10B). Then, in the next step S71, it is determined whether or not the recording data saved from the hard disk 13A is written in the nonvolatile memory 13B based on the acquired used capacity and / or free capacity information.

  For example, when the nonvolatile memory 13B is used only for writing the recording data saved from the hard disk 13A, it is checked whether or not the usage amount of the nonvolatile memory 13B is zero.

  If it is determined that the recording data saved from the hard disk 13A has not been written to the nonvolatile memory 13B, the data is not written back from the nonvolatile memory 13B to the hard disk 13A, and the process according to the flowchart of FIG. Is terminated. The processing is directly transferred to the processing in step S53 in FIG. 15 and step S63 in FIG.

  On the other hand, if it is determined in step S71 that the recording data saved from the hard disk 13A has been written in the non-volatile memory 13B, the process proceeds to step S72, and the hard disk 13A of the data written in the non-volatile memory 13B. Is written back. That is, in the same manner as the processing of step S32 to step S35 described with reference to the flowchart of FIG. 13, based on the save information, read access is made to the nonvolatile memory 13B, and the read data is written to the hard disk 13A. Return processing is performed (step S72). If it is determined that the write-back to the hard disk 13A is successful, the corresponding entry in the save information and the corresponding data in the nonvolatile memory 13B are deleted (step S73), and the processing according to the flowchart of FIG.

  Next, a second embodiment of the present invention will be described. The second embodiment of the present invention is an example in which the first embodiment of the present invention described above is applied to a portable video camera device. FIG. 18 shows an exemplary configuration of a portable video camera apparatus 100 according to the second embodiment of the present invention.

  The video camera apparatus 100 receives light from a subject with an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) image sensor, and converts the received light into an electrical signal by photoelectric conversion. Predetermined processing is performed to obtain digital video data, and this digital video data is recorded on a disk-shaped recording medium such as a hard disk.

  If a time-out error occurs due to dropping, vibration, or shock when recording digital video data on a disk-shaped recording medium, the recording data is written into the nonvolatile memory of the video camera device 100 and the recording data is saved to the nonvolatile memory. I will let you. The recording data saved in the nonvolatile memory is written back to the disk-shaped recording medium when the digital video data is reproduced from the disk-shaped recording medium or when the video camera device 100 is turned off.

  The video camera apparatus 100 can be connected to an external device via a predetermined interface by wired communication or wireless communication. When the connected external device is a computer device such as a personal computer, a disk-shaped recording medium on which digital video data is recorded can be mounted on the connection destination device and used as an external recording medium of the connection destination device. Has been. When the video camera device 100 is mounted and unmounted on the connection destination device, the recording data saved in the nonvolatile memory is written back to the disk-shaped recording medium.

  In FIG. 18, a CPU (Central Processing Unit) 120 controls the entire video camera apparatus 100 using a RAM 121 as a work memory based on program data stored in advance in a ROM 123. The CPU 120 reads program data from the ROM 123 and develops it on the RAM 121 to execute the program. By this program, the application unit 10, the file system unit 11, and the device driver unit 12 described with reference to FIGS. 6 and 8 are realized. In FIG. 18, the CPU 120 and each part constituting the video camera device 100 are shown to be directly connected. However, this is not limited to this example, and each part is connected to a bus via the bus. It is also possible to exchange commands and data.

  The optical lens unit 110 includes a lens system for guiding light from a subject to an image sensor included in the photoelectric conversion unit 111, an aperture adjustment mechanism, a focus adjustment mechanism, a zoom mechanism, a shutter mechanism, and the like, and collects light from the subject. Then, the light is incident on the photoelectric conversion unit 111. The aperture adjustment mechanism, focus adjustment mechanism, zoom mechanism, and shutter mechanism are controlled by the camera function unit 115 based on the control of the CPU 120. The photoelectric conversion unit 111 has an imaging element such as a CCD or a CMOS image sensor, converts light incident through the optical lens unit 110 into an electrical signal by photoelectric conversion, and performs predetermined signal processing as an imaging signal. Output.

  The image signal processing unit 112 is, for example, an imaging signal processing unit that converts an imaging signal output from the photoelectric conversion unit 111 into a digital signal, and a predetermined signal for the digital signal obtained by converting the imaging signal by the imaging signal processing unit. A video signal processing unit that performs processing and converts into baseband digital video data, and a compression encoding unit that compresses and encodes baseband digital video data obtained by the video signal processing unit by a predetermined method.

  The imaging signal processing unit, for example, samples only a signal having image information by a CDS (Correlated Double Sampling) circuit with respect to the imaging signal output from the photoelectric conversion unit 111, removes noise, and performs AGC (Auto Gain Control). ) Adjust the gain with the circuit. And it converts into a digital signal by A / D conversion. In addition, the imaging signal processing unit sends information on the imaging signal output from the photoelectric conversion unit 111 to the CPU 120. The CPU 120 generates a control signal for controlling the optical lens unit 110 based on this information, and controls the focus adjustment mechanism, the aperture adjustment mechanism, and the like.

  The video signal processing unit performs predetermined signal processing on the digital signal obtained by the imaging signal processing unit. For example, the video signal processing unit performs detection type signal processing on the digital signal, and extracts components of each color of R (red), G (green), and B (blue). Then, processing such as γ correction and white balance correction is performed based on each extracted color component, and finally, it is output as one baseband digital video data.

  The compression encoding unit compresses and encodes the baseband digital video data output from the video signal processing unit in accordance with, for example, MPEG2 (Moving Pictures Experts Group 2) system. The present invention is not limited to this example. H.264 | AV, ie, ITU-T (International Telecommunication Union-Telecommunication Standardization Sector) recommendation H.264. It is also conceivable to use a compression encoding method conforming to H.264 or ISO (International Organization for Standarization) / IEC (International Electrotechnical Commission) International Standard 14496-10 (MPEG-4 Part 10) Advanced Video Coding.

  The display unit 114 can perform display based on digital video data supplied from the image signal processing unit 112 using, for example, an LCD (Liquid Crystal Display) as a display element. The display unit 114 is used as a monitor of a captured image during shooting, and can display a playback image during playback.

  The image input / output unit 113 outputs the digital video data output from the image signal processing unit 112 to the outside. Digital video data supplied from outside can also be supplied to the image signal processing unit 112. Further, the image input / output unit 113 includes an A / D conversion unit and a D / A conversion unit, and the digital video data output from the image signal processing unit 112 is converted into an analog video signal for output or supplied from the outside. The analog video signal thus converted may be converted into digital video data and supplied to the image signal processing unit 112.

  The audio input / output unit 116 has audio input / output means such as a microphone and a speaker, and converts external audio into an audio signal or converts an audio signal into audio. The audio input / output unit 116 also includes an audio signal input / output unit. The audio processing unit 117 A / D converts the analog audio signal supplied from the audio input / output unit 116 into digital audio data, performs predetermined audio signal processing such as noise removal and sound quality correction, and baseband digital audio data Output as. The baseband digital audio data may be compressed and encoded by a predetermined method. The audio signal processing unit 117 performs predetermined audio signal processing such as sound quality correction and volume adjustment on the supplied digital audio data, D / A converts it to an analog audio signal, performs amplification processing, etc. This is supplied to the input / output unit 116.

  The operation input unit 124 is provided with a predetermined operation element for the user to operate the operation of the video camera apparatus 100, and this control signal for outputting a control signal corresponding to the operation on the operation element is supplied to the CPU 120. . The CPU 120 controls the operation of each unit of the video camera device 100 by processing a program based on a control signal supplied from the depth input unit 124 in response to a user operation. Further, a simple display unit may be provided in the operation input unit 124 to perform a predetermined display regarding the operation of the video camera device 100.

  The drive unit 126 controls the recording medium based on a command from the CPU 120. For example, digital video data captured by the image sensor of the photoelectric conversion unit 111 and compressed and encoded by the image signal processing unit 112 is recorded on a recording medium based on a command from the CPU 120.

  The recording medium applicable to the drive unit 126 is not particularly limited as long as it is a randomly accessible recording medium, but a magnetic disk such as a hard disk, a recordable type DVD (Digital Versatile Disc) or CD (Compact). Disc), Blu-ray Disc (registered trademark) optical disc, magneto-optical disc-like recording medium, and semiconductor memory are suitable.

  Here, a rewritable nonvolatile memory such as a flash memory is used as the semiconductor memory, and the digital video data compressed and encoded by the image signal processing unit 112 is recorded on another recording medium, for example, a disk-shaped recording medium such as a hard disk. Thus, according to the present invention, recording data can be saved in response to a recording error of the disk-shaped recording medium.

  In the example of FIG. 18, the drive unit 126 is shown to be common to various recording media, but in reality, a drive unit is provided for each recording medium. Further, it is not necessary to support all the recording media shown in FIG. 18, and the video camera apparatus 100 includes, for example, the above-described semiconductor memory as a nonvolatile memory, a hard disk, a recordable optical disk, and a magneto-optical disk. It is sufficient to correspond to at least one of them.

  The communication unit 125 communicates with an external device by wire and / or wireless using a predetermined protocol based on the control of the CPU 120. The wired and / or wireless communication interface is not particularly limited as long as digital communication is possible, but as the wired communication, a LAN (Local Area Network) by USB, IEEE 1394, Ethernet (registered trademark), or the like can be considered. . In addition, IEEE802.11a / b / g, Bluetooth, etc. can be considered as wireless communication. Further, by connecting an external device having a host function such as a personal computer with an interface such as USB or IEEE1394 and the video camera device 100, a recording medium connected to the drive unit 126 of the video camera device 100 can be connected to an external device. Can be mounted on equipment.

  The sensor 127 detects acceleration applied to the video camera device 100. The detection result of the sensor 127 is transferred to the CPU 120. The power supply unit 130 is formed of a battery, for example, and supplies power to each unit of the video camera device 100. ON / OFF of power supply by the power supply unit 130 is controlled by the CPU 120 in accordance with, for example, a predetermined operation on the operation input unit 124.

  An example of the operation of the video camera apparatus 100 according to the second embodiment will be schematically described. In the following, it is assumed that the stream data is recorded using a hard disk of a hard disk drive built in the video camera apparatus 100 as a recording medium. In addition, a non-volatile memory such as a flash memory is connected to the drive unit 126 as another recording medium. In this case, it is preferable that the flash memory is built in the video camera device 100 in advance.

  First, when the power of the video camera device 100 is turned on, as described with reference to the flowchart of FIG. 15, predetermined processing is performed in each part of the video camera device 100 as the power is turned on (step S50). For example, the program data is read from the ROM 123 by the CPU 120, the file system unit 11 and the device driver unit 12 are formed by the program, and the application unit 10 is activated. In addition, each unit of the video camera device 100 is initialized. Then, a recording medium (in this example, a hard disk and a flash memory) connected to the drive unit 126 is mounted on the system by the CPU 120 (step S51), and the save information is read into the CPU 120. The save information is stored, for example, in a predetermined area of the flash memory. Based on the save information, if there is save data in the flash memory, the CPU 120 writes the save data back to the hard disk (step S53). Thereafter, further necessary processing is performed (step S54).

  At the time of recording, light from the subject enters the photoelectric conversion unit 111 via the optical lens unit 110, is converted into an electrical signal by the imaging element, and is output as an imaging signal by predetermined signal processing. The imaging signal is supplied to the image signal processing unit 112, converted into a digital signal by the imaging signal processing unit in the image signal processing unit 112, and this digital signal is subjected to predetermined signal processing by the video signal processing unit and is digitally converted into a baseband digital signal. Video data. The baseband digital video data is supplied to the display unit 114, displayed on the display element, and supplied to the image input / output unit 113.

  Further, the image signal processing unit 112 compresses and encodes baseband digital video data based on the imaging signal by a predetermined method to obtain compressed digital video data.

  In addition, sound is collected by a microphone included in the sound input unit 116 to be an analog sound signal, and the analog sound signal is converted to baseband digital audio data by the sound signal processing unit 117.

  The CPU 120, for example, in response to a user's recording start operation on the operation input unit 124, the compressed digital video data supplied from the image signal processing unit 112 and the baseband digital audio data supplied from the audio signal processing unit 117. Are multiplexed into predetermined stream data and supplied to the drive unit 126. Then, the CPU 120 instructs the drive unit 126 to record the stream data on a recording medium. Here, the stream data is stored in a file and recorded on a hard disk.

  The CPU 120 refers to the directory entry and FAT on the hard disk in the recording control unit 20 of the file system unit 11 (see FIG. 8) executed by the program, and starts the cluster number for recording the file storing the stream data. Further, the cluster number of the cluster in which the recording data is continuously recorded from the cluster of the head cluster number is acquired. The recording medium control unit 21 of the file system unit 11 converts the cluster number acquired by the recording control unit 20 into the LBA of the hard disk. The LBA is passed to the device driver corresponding to the hard disk of the device driver unit 12 executed by the CPU 120 according to the program. The device driver generates a command for writing the recording data to the hard disk based on the LBA and the recording data, and writes the recording data to the hard disk based on this command, for example, in units of sectors.

  While the stream data is recorded on the hard disk, the CPU 120 monitors the output signal of the sensor 127. The CPU 120 applies a drop, vibration, or shock to the video camera device 100 such that the acceleration detected by the sensor 127 is equal to or greater than a predetermined value and a recording error may occur when the stream data is recorded on the hard disk. It is determined that When the sensor 127 detects an acceleration greater than or equal to a predetermined value, the CPU 120 saves the stream data recording destination from the hard disk to the flash memory.

  In this case, since a recording error can be avoided in advance, out of the processing described with reference to the flowchart of FIG. 9, the evacuation information creation in step S19 and the writing success in step S13 from the processing for checking the free space in the nonvolatile memory in step S15. Processing up to notification is performed.

  For example, if the CPU 120 determines that an acceleration greater than or equal to a predetermined value has been applied to the video camera device 100 based on the detection result of the sensor 127, the free space in the flash memory that is the save destination of the recording data to be written to the hard disk is step S15 in FIG. The capacity is confirmed, and if it can be saved, the recording data stored in the buffer memory for writing to the hard disk is written to the flash memory (step S17). If the writing is successful, save information is created and the stored save information is updated (step S19). The save information can be written in the nonvolatile memory by connecting a nonvolatile memory such as a flash memory separately to the drive unit 126, for example. However, the present invention is not limited to this, and a predetermined area of the flash memory as a save destination of the recording data can be secured for writing save information. If the recording data has been successfully written to the flash memory, it is notified to the host (step S13).

  Based on the detection result from the sensor 127, the CPU 120 continues to save and store the recording data in the flash memory while the video camera apparatus 100 is being accelerated by a predetermined value or more. When the acceleration detected by the sensor 127 falls below a predetermined value, the saving of the recording data to the flash memory is terminated, and the recording destination of the recording data is switched from the flash memory to the hard disk.

  At the time of reproducing the stream data recorded on the hard disk, as described with reference to FIG. 13, the recording data saved in the flash memory is attempted to be written back to the hard disk. For example, the CPU 120 reads the save information in response to the user's reproduction start operation on the operation input unit 124. As described with reference to the flowcharts of FIGS. 13 and 14, the recording medium control unit 21 of the file system unit 11 reads the data requested to be read based on the save information and the LBA requested for read access. It is determined whether a part or all of the data has been saved in the flash memory (step S30).

  Thereafter, if all of the data requested to be read is saved in the flash memory, the processing in steps S32 to S35 is performed, the data is read from the flash memory, and the data read based on the save information is stored in the hard disk. The process of writing back to is performed. If the data requested to be read is not saved in the flash memory, the data is read from the hard disk by the process of step S36. If a part of the data requested to be read has been saved in the flash memory, the processes in steps S37 to S44 (see FIG. 14) are performed, and the access order between the hard disk and the flash memory is calculated based on the saved information. Then, based on the calculated access order and save information, the data is read from the hard disk and the flash memory, and the data read from the flash memory is written back to the hard disk.

  When another device such as a computer device having a host function is connected to the communication unit 125, a recording medium connected to the drive unit 126 of the video camera device 100 can be mounted on the other device. Accordingly, for example, stream data recorded on a hard disk connected to the drive unit 126 is directly transmitted to the other device, or data is transmitted from the other device to the video camera device 100. Can send and write to hard disk. It is also possible to control the video camera device 100 from the other device.

  When another device having a host function is connected to the communication unit 125 using, for example, USB as an interface, a predetermined protocol is used between the communication unit 125 and the communication interface of the other device using a USB protocol. Communication takes place and communication is established. At the same time, as described with reference to the flowchart of FIG. 16, the CPU 120 writes, for example, unrecorded data stored in the buffer memory to the hard disk (step S60), and the file system unit 11 opens the open file. Are closed (step S61). Further, the save information is read by the CPU 120, and the recording data saved in the flash memory based on the save information is written back to the hard disk in a predetermined manner. Then, the hard disk and flash memory connected to the drive unit 126 are unmounted from the system of the video camera apparatus 100 (step S63), and then further necessary processing is performed (step S64). At this time, for example, a hard disk mounting process is performed by another connected device.

  Even when the video camera device 100 is turned off, as described with reference to the flowchart of FIG. 16, unrecorded data stored in the buffer memory is written to the hard disk, and all open files are closed and saved. Based on the information, the process of writing back the recording data saved in the flash memory to the hard disk is performed. Then, the hard disk or flash memory connected to the drive unit 126 is unmounted, and other necessary processes such as initialization of each unit are performed.

  In the above description, the example in which the present invention is applied to the video camera device 100 configured to record the video data based on the imaging signal captured by the imaging device on the hard disk has been described. However, the present invention is not limited to this example. For example, a recording medium for recording video data can be applied to other types of recording media as long as random access is possible and a recording error occurs due to dropping, vibration, or impact on the apparatus. .

  For example, a recordable optical disc such as a recordable DVD or Blu-ray Disc can be used as the recording medium. Even in this case, it is determined that there is a possibility of causing a recording error due to dropping, vibration, or shock based on the detection result of the sensor, or a time-out error has occurred when writing the recording data, as in the above-described processing. At this time, the recording data is saved in the flash memory and the recording is continued. Note that these recordable optical discs are generally detachable from the video camera apparatus 100. Therefore, even when the recording medium is ejected, a process of writing back the recording data saved in the flash memory to the recording medium is performed.

  In the above description, the save destination of the recording data has been described as being the non-volatile memory 13B, but this is not limited to this example. That is, other types of recording media can be applied as long as the storage destination of the recording data is a recording medium that does not lose the stored contents even when the apparatus is turned off. For example, an empty area of the hard disk 13A itself can be used as a save destination for recording data. In this case, for example, a free area between the MBR and the PBR in the data structure of the hard disk shown in FIGS. 1A and 1B can be considered as a recording data save destination.

  Furthermore, in the above description, it has been described that the acceleration is detected by the sensor 127 to determine whether there is a drop, vibration, or impact, but this is not limited to this example. For example, the sensor 127 may be a temperature sensor that detects the temperature inside the video camera apparatus 100. When the inside of the video camera device 100 reaches a predetermined temperature or more, it is considered that the possibility of a recording error occurring in the hard disk 13A increases, and the recording data written to the hard disk 13A can be saved to the nonvolatile memory 13B. Of course, both the acceleration sensor and the temperature sensor are provided, and when either one of the detection result of the acceleration sensor and the detection result of the temperature sensor exceeds a predetermined value, the recording data written in the hard disk 13A is saved in the nonvolatile memory 13B. It may be.

  Furthermore, the present invention can also be applied to a computer apparatus 200 having a general configuration as shown in FIG. In FIG. 19, a CPU 210, a RAM 211 and a ROM 212, and an input / output interface 220 are connected to a bus 201. The CPU 210 starts up the system using the RAM 211 as a work memory based on a program stored in advance in the ROM 212, reads program data recorded in advance in a hard disk 224 </ b> B, which will be described later, and develops the program in the RAM 211. Each part of the computer apparatus 200 is controlled based on the data.

  The input / output interface 220 functions as a device controller for each input / output device to be connected, and is actually provided according to the type of the input / output device.

  As a device of the input unit 221 that receives data input, for example, a pointing device such as a keyboard 221A and a mouse 221B, an image input device such as a scanner 221C, and a voice input device such as a microphone 221D are conceivable. Of course, a video camera using a CCD or CMOS image sensor as an imaging device can also be used as an input device. The scanner 221C transmits image data to the computer apparatus 200 using a USB interface 223A or an IEEE 1394 interface 223B described later as a connection interface. Further, when the microphone 221D is used as an input device, A / D conversion means for converting an analog audio signal output from the microphone into digital audio data is required.

  As a device of the output unit 222 that outputs data, a display 222A, a speaker 222B, a printer device 222C, and a plotter device 222D can be considered. The display 222A is actually connected to the computer device 200 via a video signal processing unit (not shown) that converts the display control signal generated by the CPU 210 into a video signal. When the speaker 222B is used as an output device, D / A conversion means for converting digital audio data supplied via the bus 201 into an analog audio signal is required. Further, the printer device 222C and the plotter device 222D perform printing based on an image signal supplied via the bus 201 using a USB interface 223A, an IEEE 1394 interface 223B, which will be described later, and other interfaces as connection interfaces.

  As a device of the communication unit 223 that performs data communication with the outside, a USB interface 223A that controls communication by USB, an IEEE 1394 interface 223B that controls communication by IEEE 1394, a Bluetooth interface 223C that controls wireless communication by Bluetooth, and so-called wireless LAN are used. A controlling IEEE 802.11a / b / g interface 223D is conceivable. Each interface communicates with a connected device using a predetermined protocol.

  As a device of the recording unit 224 for recording data, an optical disc 224A such as a recordable DVD or Blu-ray Disc, a magnetic disc 224B such as a hard disk, a magneto-optical disc 224C such as an MO (Magneto-Optical Disc), a rewritable and non-volatile device. A semiconductor memory 224D such as a flash memory that is a volatile memory is conceivable. The optical disk 224A and the magneto-optical disk 224C are used by being loaded into a corresponding drive (not shown). The hard disk is used as a hard disk drive (HDD) including a hard disk body that is a recording medium itself and a drive device for driving the hard disk.

  In the computer device 200 having such a configuration, for example, when a time-out error occurs when data is recorded on the hard disk (magnetic disk 224B), the optical disk 224A, or the magneto-optical disk 224C, FIG. The recording data can be saved in the semiconductor memory 224D, which is a non-volatile memory, by the procedure already described.

  Furthermore, apparatuses to which the present invention can be applied are not limited to the video camera apparatus 100 and the computer apparatus 200 described above. That is, the present invention can be applied to other types of apparatuses as long as the apparatus uses a recording medium that can be randomly accessed such as a hard disk and that may cause a recording error due to dropping, vibration, impact, or the like. be able to. For example, the present invention can be applied to a recorder that records an audio signal on a hard disk, an optical disk, or a magneto-optical disk.

  Also, in recent years, in addition to the original telephone function, a hard disk is built in, and music data received by radio waves, or music data etc. can be transferred from the computer device by connecting to a computer device or the like with a predetermined interface by wire. Mobile phone terminals that can be used are showing signs of widespread use. The present invention can also be applied to such a mobile phone terminal with a built-in hard disk.

  Furthermore, in the above description, the present invention has been described as applied to a file system based on FAT, but this is an example and the present invention is not limited to this example. That is, the present invention can be applied to other file systems as long as the file system performs address management in a predetermined unit for a randomly accessible recording medium.

It is a basic diagram which shows the example of the data structure of the hard disk formatted based on the FAT file system. It is a basic diagram which shows the structure of an example of a master boot record. It is a basic diagram which shows the structure of an example of a partition table. It is a basic diagram which shows the structure of an example of the directory entry in FAT16. It is a basic diagram which shows the example of FAT by FAT32. It is a basic diagram which shows an example architecture for implement | achieving a file system. It is a basic diagram for demonstrating embodiment of this invention. It is a block diagram which shows in more detail the structure of an example of the file system by FAT applicable to the 1st Embodiment of this invention. It is a flowchart which shows an example recording process by the 1st Embodiment of this invention. It is a basic diagram which shows an example of evacuation information. It is a flowchart for demonstrating the process which writes the recording data stored in the buffer to a hard disk. FIG. 4 is a schematic diagram illustrating an example file layout when moving image data files “M2U00001.MPG”, “M2U00002.MPG”, and “M2U00003.MPG” are written to a hard disk. 6 is a flowchart illustrating an example of processing for writing back recorded data written in a nonvolatile memory to a hard disk when data is read from the hard disk. 6 is a flowchart illustrating an example of processing for writing back recorded data written in a nonvolatile memory to a hard disk when data is read from the hard disk. 10 is a flowchart for explaining an example of processing for performing write back when a hard disk is mounted and unmounted. 10 is a flowchart for explaining an example of processing for performing write back when a hard disk is mounted and unmounted. 10 is a flowchart for explaining an example of processing for performing write back when a hard disk is mounted and unmounted. It is a block diagram which shows the structure of an example of the portable video camera apparatus 1 by the 2nd Embodiment of this invention. It is a block diagram which shows the structure of an example of a general computer apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Application part 11 File system part 12 Device driver part 13 Recording medium 13A Hard disk 13B Non-volatile memory 20 Recording control part 21 Recording medium control part 22 Directory entry control part 23 Cluster control part 24 FAT control part 25 Position calculation part 30 Work memory 100 Video camera device 110 Optical lens unit 111 Photoelectric conversion unit 112 Image signal processing unit 114 Display unit 116 Audio input / output unit 117 Audio processing unit 120 CPU
121 RAM
123 ROM
124 Operation input unit 125 Communication unit 126 Drive unit 127 Sensor

Claims (50)

In a recording apparatus for recording data on a disk-shaped recording medium,
A recording unit for writing the requested data to the disk-shaped recording medium;
A determination unit that determines whether or not the writing of the data requested to be written to the disk-shaped recording medium is normally performed;
A control unit that controls writing of data to the disk-shaped recording medium by the recording unit;
The control unit
When the determination unit determines that the writing of the data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium, and the management of the data requested to be written is performed. A recording apparatus characterized in that information is created and held. The recording apparatus according to claim 1,
The control unit
A recording apparatus, wherein the write-requested data written to the storage medium is written to the disc-shaped recording medium based on the management information at a predetermined timing. The recording apparatus according to claim 2,
The recording apparatus according to claim 1, wherein the predetermined timing is when the disc-shaped recording medium is unmounted. The recording apparatus according to claim 3,
The recording apparatus according to claim 1, wherein the predetermined timing is a power-off process of the apparatus. The recording apparatus according to claim 3,
A communication unit capable of communicating with a device having a host function;
The recording apparatus according to claim 1, wherein the predetermined timing is a connection process for connecting to the device having the host function via the communication unit. The recording apparatus according to claim 2,
The recording apparatus according to claim 1, wherein the predetermined timing is when the disc-shaped recording medium is mounted. The recording apparatus according to claim 6, wherein
The recording apparatus according to claim 1, wherein the predetermined timing is a power-on process of the apparatus. The recording apparatus according to claim 6, wherein
A communication unit capable of communicating with a device having a host function;
The recording apparatus according to claim 1, wherein the predetermined timing is a timing at which a device having the host function connected via the communication unit releases the connection. The recording apparatus according to claim 2,
The control unit
When the write-requested data written to the storage medium is written to the disc-shaped recording medium, the write-requested data is deleted from the storage medium and the corresponding information in the management information is deleted. A recording apparatus. The recording apparatus according to claim 1,
The judgment part
A recording apparatus, wherein if a recording error occurs when data is written to the disk-shaped recording medium by the recording unit, it is determined that the data requested to be written is not normally written. The recording apparatus according to claim 10.
The recording apparatus, wherein the recording error is a recording processing timeout. The recording apparatus according to claim 1,
A sensor unit for detecting acceleration, vibration, and / or impact applied to the disk-shaped recording medium;
The judgment part
A recording apparatus, wherein when the acceleration, vibration, and / or impact is detected by the sensor unit, it is determined that the writing of the data requested to be written is not normally performed. The recording apparatus according to claim 1,
The above management information
At least address information indicating an address on the disk-shaped recording medium based on the write request is associated with address information indicating an address on the storage medium when the data requested to be written is written to the storage medium. A recording apparatus. The recording apparatus according to claim 1,
The recording apparatus, wherein the storage medium is a flash memory. In a recording method for recording data on a disc-shaped recording medium,
A recording step of writing the requested data to the disc-shaped recording medium;
A step of determining whether or not writing of the data requested to be written to the disc-shaped recording medium is normally performed;
A control step of controlling writing of data to the disc-shaped recording medium by the recording step,
The above control steps are:
When it is determined in the determination step that the writing of the data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium, and the data requested to be written A recording method characterized in that management information is created and held. In a recording program for causing a computer device to execute a recording method for recording data on a disk-shaped recording medium,
The above recording method is
A recording step of writing the requested data to the disc-shaped recording medium;
A step of determining whether or not writing of the data requested to be written to the disc-shaped recording medium is normally performed;
A control step of controlling writing of data to the disc-shaped recording medium by the recording step,
The above control steps are:
When it is determined in the determination step that the writing of the data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium, and the data requested to be written A recording program for causing a computer apparatus to execute a recording method for creating and holding management information. In a recording / reproducing apparatus for recording data on a disk-shaped recording medium and reproducing data from the disk-shaped recording medium,
A recording unit for writing the requested data to the disk-shaped recording medium;
A playback unit for playing back data written on a disk-shaped recording medium based on a read request;
A determination unit that determines whether or not the writing of the data requested to be written to the disk-shaped recording medium is normally performed;
A controller that controls writing of data to the disc-shaped recording medium by the recording unit and reproduction of data from the disc-shaped recording medium by the reproducing unit;
The control unit
When the determination unit determines that the writing of the data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium, and the management of the data requested to be written is performed. A recording / reproducing apparatus characterized in that information is created and held. The recording / reproducing apparatus according to claim 17,
The control unit
A recording / reproducing apparatus, wherein the write-requested data written to the storage medium is written to the disc-shaped recording medium based on the management information at a predetermined timing. The recording / reproducing apparatus according to claim 18,
The recording / reproducing apparatus, wherein the predetermined timing is when the data written in the disc-shaped recording medium is reproduced by the reproducing unit. The recording / reproducing apparatus according to claim 18,
The recording / reproducing apparatus, wherein the predetermined timing is when the disc-shaped recording medium is unmounted. The recording / reproducing apparatus according to claim 20,
The recording / reproducing apparatus, wherein the predetermined timing is a power-off process of the apparatus. The recording / reproducing apparatus according to claim 20,
A communication unit capable of communicating with a device having a host function;
The recording / reproducing apparatus according to claim 1, wherein the predetermined timing is a connection process for connecting to the device having the host function via the communication unit. The recording / reproducing apparatus according to claim 18,
The recording / reproducing apparatus, wherein the predetermined timing is when the disc-shaped recording medium is mounted. The recording / reproducing apparatus according to claim 23,
The recording / reproducing apparatus, wherein the predetermined timing is a power-on process of the apparatus. The recording / reproducing apparatus according to claim 23,
A communication unit capable of communicating with a device having a host function;
The recording / reproducing apparatus, wherein the predetermined timing is a timing at which a device having the host function connected via the communication unit releases the connection. The recording / reproducing apparatus according to claim 18,
The control unit
When the write-requested data written to the storage medium is written to the disc-shaped recording medium, the write-requested data is deleted from the storage medium and the corresponding information in the management information is deleted. A recording / reproducing apparatus. The recording / reproducing apparatus according to claim 26,
The control unit
When data is reproduced based on a read request from the disk-shaped recording medium by the reproduction unit,
If the data included in the data range indicated in the read request is written to the storage medium based on the management information, the read of the storage medium is performed when reproducing the data from the disc-shaped recording medium. A recording / reproducing apparatus, wherein the data corresponding to the data included in the data range indicated in the request is read from the storage medium. The recording / reproducing apparatus according to claim 17,
The judgment part
A recording / reproducing apparatus, wherein if a recording error occurs during the writing of data to the disk-shaped recording medium by the recording unit, it is determined that the writing of the requested data is not performed normally. The recording / reproducing apparatus according to claim 28,
The recording / reproducing apparatus according to claim 1, wherein the recording error is a recording processing timeout. The recording / reproducing apparatus according to claim 17,
A sensor unit for detecting acceleration, vibration, and / or impact applied to the disk-shaped recording medium;
The judgment part
A recording / reproducing apparatus, wherein when the acceleration, vibration, and / or impact is detected by the sensor unit, it is determined that the writing of the data requested to be written is not normally performed. The recording / reproducing apparatus according to claim 17,
The above management information
At least address information indicating an address on the disk-shaped recording medium based on the write request is associated with address information indicating an address on the storage medium when the data requested to be written is written to the storage medium. And a recording / reproducing apparatus. The recording / reproducing apparatus according to claim 17,
The recording / reproducing apparatus, wherein the storage medium is a flash memory. In a recording / reproducing method for recording data on a disk-shaped recording medium and reproducing data from the disk-shaped recording medium,
A recording step of writing the requested data to the disc-shaped recording medium;
A reproduction step of reproducing data written on the disk-shaped recording medium based on a read request;
A step of determining whether or not writing of the data requested to be written to the disc-shaped recording medium is normally performed;
A control step for controlling the writing of data to the disc-shaped recording medium by the recording step and the reproduction of the data from the disc-shaped recording medium by the reproducing step;
The above control steps are:
When it is determined in the determination step that the writing of the data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium, and the data requested to be written A recording / reproducing method characterized in that management information is created and held. In a recording / reproducing program for causing a computer apparatus to execute a recording / reproducing method for recording data on a disc-shaped recording medium and reproducing the data from the disc-shaped recording medium,
The above recording / reproducing method is:
A recording step of writing the requested data to the disc-shaped recording medium;
A reproduction step of reproducing data written on the disk-shaped recording medium based on a read request;
A step of determining whether or not writing of the data requested to be written to the disc-shaped recording medium is normally performed;
A control step for controlling the writing of data to the disc-shaped recording medium by the recording step and the reproduction of the data from the disc-shaped recording medium by the reproducing step;
The above control steps are:
When it is determined in the determination step that the writing of the data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium, and the data requested to be written A recording / reproducing program for causing a computer apparatus to execute a recording / reproducing method for creating and holding management information. In an imaging apparatus for recording video data obtained by imaging a subject with an imaging unit on a disk-shaped recording medium and reproducing the video data from the disk-shaped recording medium,
An imaging unit for imaging a subject and outputting video data;
A recording unit for writing the requested video data to a disc-shaped recording medium;
A playback unit for playing back video data written on a disk-shaped recording medium based on a read request;
A determination unit for determining whether or not the writing of the video data requested to be written to the disc-shaped recording medium is normally performed;
A controller for controlling the writing of video data to the disc-shaped recording medium by the recording unit and the reproduction of video data from the disc-shaped recording medium by the reproducing unit;
The control unit
When the determination unit determines that the writing of the video data requested to be written is not normally performed, the data requested to be written is written to a nonvolatile storage medium and the video data requested to be written An imaging apparatus characterized in that the management information is created and held. The imaging device according to claim 35,
The control unit
An image pickup apparatus, wherein the video data requested to be written written to the storage medium is written to the disc-shaped recording medium based on the management information at a predetermined timing. The imaging device according to claim 36,
The imaging apparatus according to claim 1, wherein the predetermined timing is when the video data written on the disc-shaped recording medium is reproduced by the reproducing unit. The imaging device according to claim 36,
The imaging apparatus according to claim 1, wherein the predetermined timing is when the disc-shaped recording medium is unmounted. 40. The imaging device according to claim 38.
The imaging apparatus according to claim 1, wherein the predetermined timing is a power-off process of the apparatus. 40. The imaging device according to claim 38.
A communication unit capable of communicating with a device having a host function;
The imaging apparatus according to claim 1, wherein the predetermined timing is a connection process for connecting to a device having the host function via the communication unit. The imaging device according to claim 36,
The imaging apparatus according to claim 1, wherein the predetermined timing is when the disc-shaped recording medium is mounted. The imaging apparatus according to claim 41,
The imaging apparatus according to claim 1, wherein the predetermined timing is a power-on process of the apparatus. The imaging apparatus according to claim 41,
A communication unit capable of communicating with a device having a host function;
The imaging apparatus according to claim 1, wherein the predetermined timing is a timing at which the device having the host function connected via the communication unit releases the connection. The imaging device according to claim 36,
The control unit
When the video data requested to be written written to the storage medium is written to the disc-shaped recording medium, the video data requested to be written is deleted from the storage medium and the corresponding information of the management information is deleted. An imaging apparatus characterized by: 45. The imaging device according to claim 44, wherein
The control unit
When video data is played back based on a read request from the disc-shaped recording medium by the playback unit,
If the video data included in the video data range indicated in the read request is written to the storage medium based on the management information, the storage medium can be used when reproducing the video data from the disc-shaped recording medium. An image pickup apparatus, wherein the video data corresponding to the video data included in the video data range indicated in the read request is read from the storage medium. The imaging device according to claim 35,
The judgment part
An image pickup apparatus, wherein if a recording error occurs when video data is written to the disk-shaped recording medium by the recording unit, it is determined that the video data requested to be written is not normally written. The imaging device according to claim 46,
The imaging apparatus, wherein the recording error is a timeout of recording processing. The imaging device according to claim 35,
A sensor unit for detecting acceleration, vibration, and / or impact applied to the disk-shaped recording medium;
The judgment part
An imaging apparatus, wherein when the acceleration, vibration, and / or impact is detected by the sensor unit, it is determined that the writing of the video data requested to be written is not normally performed. The imaging device according to claim 35,
The above management information
At least address information indicating an address on the disk-shaped recording medium based on the write request is associated with address information indicating an address on the storage medium when the video data requested to be written is written to the storage medium. An imaging device characterized in that the imaging device is provided. The imaging device according to claim 35,
An image pickup apparatus, wherein the storage medium is a flash memory.

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