JP2009181621A - Information recording / reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording and reproducing device which checks reliability of a disk regardless of the data recorded areas on the disk. <P>SOLUTION: Data are recorded on an optical disk, and a specific recording layer is selected to verify the recorded data. On this selected recording layer, a physically outermost address out of the addresses of data to be used for reproduction is specified as a reference address for verification. Then, verification is carried out on this area by specifying a predetermined area around the reference address as an area to be verified. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information recording / reproducing apparatus for recording data on an optical disc, and more particularly to a verification process for data recorded on an optical disc.

  In recent years, digital camcorders that shoot digital video are shifting from tapes that use sequential access to recording media that have random access media. One of the randomly accessible recording media is an HDD (Hard Disk Drive). Hereinafter, a digital camcorder having such a recording medium is referred to as an HDD camcorder. Since the HDD has a high capacity, the user can shoot for a long time, but eventually the capacity will be used up. For this reason, the user needs to back up contents to be saved to another recording medium such as an optical disk in order to free up capacity, and then delete the contents.

  As a backup method, there is known a method in which an HDD camcorder is connected to a personal computer or an external optical disk drive by a connection means such as USB (Universal Serial Bus) or IEEE 1394 and stored on an optical disk.

  Current optical disks include CD-R, CD-RW, DVD-RAM, DVD-R (including two layers), DVD-RW, DVD + R (including two layers), DVD + RW, Blu-Ray Disc, HD DVD, etc. Although disks are widely used, it is necessary to perform “verify” on such disks in order to improve the reliability of backup.

The verify reads data recorded on the disk and checks for errors.
If an error is detected by verification, it means that the disc may not be played normally.

  For example, if the content of an HDD camcorder is backed up to a disk in a format that complies with the DVD-Video standard, if MPEG-2 Program Stream in which video and audio digital data is multiplexed cannot be read, Audio interruptions and disturbances may occur. If management information for managing video and audio data cannot be read, there is a possibility that a specific playback unit such as a title or a chapter or all contents cannot be played back.

  For this reason, in order to maintain the reliability of the disk on which the content is backed up, it is preferable to verify all recorded areas, but there is a problem that verification takes time. For example, even if recording is performed at 2 × speed (1 × DVD speed is 1.385 MB / S), if the same amount of time is spent for verification, recording at 1 × speed is actually performed.

  Therefore, as a method of shortening the verify time while maintaining the reliability of the disc, a method of partially verifying the backed up content can be considered. In particular, it is generally known that in an optical disc, defects tend to gather near the outer periphery due to the warp of the disc or fingerprints. Therefore, if the verification is performed targeting the vicinity of the outer periphery, the reliability of the disk can be confirmed efficiently without taking time.

A method for realizing such a method is disclosed in Patent Document 1. In Patent Document 1, the quality of the disc is checked in advance for each manufacturer, and an address table for registering addresses of locations with poor recording quality (for example, near the outer periphery) is prepared in advance, and verification is turned ON / OFF according to this address table. A recording / reproducing apparatus that automatically switches is described.
JP 2006-309866 A

  In the conventional recording / reproducing apparatus, the address to be verified is fixedly determined. Therefore, when data is not recorded in the address range, nothing is verified.

  For this reason, even when a writing operation requiring verification is performed, it cannot be confirmed whether or not data is correctly written on the disk.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording / reproducing apparatus capable of confirming the reliability of a disc regardless of the data area recorded on the disc.

  In order to solve the above-described conventional problems, the information recording / reproducing apparatus of the present invention records data on an optical disc having one or more recording layers, and performs information verification to confirm whether the recording is correct. A reproducing apparatus, a recording unit for recording data on the optical disc, a recording layer selecting unit for selecting a specific recording layer for verifying data recorded by the recording unit, and a recording layer selecting unit. Further, in the specific recording layer, the reference address specifying means for specifying the address physically located at the outer periphery among the addresses of the data used at the time of reproduction as the reference address for verification, and the reference address specifying means specified A verification range specifying means for specifying a predetermined range based on the reference address as a verification range; and Having a verify execution means for executing a verification based on the verification range where phi range specifying means specified, and is obtained by it said.

  Further, the present invention is characterized in that the specific recording layer is a recording layer closest to the surface of the recording surface among the recording layers on which data is recorded.

  Further, the present invention is characterized in that the specific recording layer is a recording layer farthest from the surface of the recording surface among the recording layers on which data is recorded.

  Further, the present invention is characterized in that the recording layer selecting means selects a recording layer adjacent to the specific recording layer when the amount of data recorded in the selected specific recording layer is less than a predetermined size. It is what.

  Furthermore, the present invention is characterized in that the specific recording layer is a recording layer in which data used at the time of reproduction is recorded on the outer periphery physically than other recording layers.

  According to the information recording / reproducing apparatus of the present invention, it is possible to provide an information recording / reproducing apparatus capable of confirming the reliability of the disc regardless of the data area recorded on the disc.

  Furthermore, it is possible to perform verification by specifying an area for checking reliability from the data area written on the disk.

  Embodiments of an information recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of information recording / reproducing apparatus 100 according to the first embodiment. In the first embodiment, it is assumed that the information recording / reproducing apparatus 100 is an HDD camcorder and backs up content recorded on the HDD using an external optical disk drive.

  First, each component of the information recording / reproducing apparatus 100 will be described.

  The input / output unit 101 operates as input / output means for performing input / output processing with the outside. It is assumed that a lens, a CCD (Charge Coupled Devices), an AD conversion unit, a DSP (Digital Signal Processor), a microphone, various operation buttons, and the like (not shown) are provided for processing input. The CCD operates as an image sensor that converts light input from a lens into an electrical signal by a photoelectric effect and outputs the electrical signal. The AD conversion unit operates as a conversion unit that converts an analog signal output from the CCD into a digital signal, and a CDS (Correlated Double Sampling) circuit that reduces noise and the amplitude of the signal according to the brightness of the subject. An AGC (Auto Gain Control) circuit that amplifies electrically and an AD conversion circuit are provided. The DSP is a microprocessor specializing in video signal processing, and performs image processing such as color separation, white balance adjustment, and γ correction on the digital signal output from the AD conversion unit, and extracts an RGB signal. Is. Further, the DSP converts the RGB signal into a luminance signal and a color difference signal, and outputs them to a video memory or a frame memory (not shown). The data output to the video memory is supplied to an LCD (Liquid Crystal Display) monitor described later, and the data output to the frame memory is supplied to a compression / decompression unit 102 described later. Various operation buttons operate as user input means. For example, a shooting start button, a determination button, a selection button, a fast forward button, a rewind button, and the like are provided.

  It is assumed that an output monitor is provided with an LCD monitor, a speaker, etc. (not shown). The LCD monitor displays a video being shot and a playback video, and various menus.

  The compression / decompression unit 102 operates as a compression / decompression unit for video / audio data. The encoding method of the video / audio data is not particularly limited. However, if it is close to the format used for backup, the backup becomes easy. For example, when backup is performed on the optical disk 112 in a format conforming to the DVD-Video standard, if the MPEG-2 Program Stream is encoded, the audio / video data is recorded on the optical disk 112 without re-encoding at the time of backup. be able to. In addition, JPEG (Joint Photographic Coding Experts Group) or the like is suitable for taking a still image.

  The HDD 103 is a recording medium on which content that is video / audio data and management information for managing the content are recorded. In this embodiment, the HDD camcorder is described as an example, and the HDD 103 is a single HDD. However, the number and types of recording media are not limited to this, and a plurality of HDDs are used. It may be used, or another type of recording medium such as an optical disk may be used. Also, a plurality of types of recording media may be used in combination, for example, a removable semiconductor memory card and HDD may be used in combination, or a removable optical disk and HDD may be used in combination. It may be a thing.

  The system control unit 104 operates as a control unit that performs overall control of the information recording / reproducing apparatus 100.

  The backup control unit 105 operates as a recording unit that records the content recorded on the HDD 103 onto the optical disc 112.

  The recording layer selection unit 106 operates as a recording layer selection unit that selects a recording layer to be verified during verification processing.

  The reference address specifying unit 107 operates as a reference address specifying unit that specifies a reference address that serves as a reference for performing verification in the verify process.

  The verify range specifying unit 108 operates as a verify range specifying means for specifying a verify range based on the above-described reference address during the verify process.

  The verification execution unit 109 operates as a verification execution unit that performs verification according to the verification range specified by the verification range specification unit 108.

  The drive control unit 110 operates as a drive control unit that issues a command for controlling the optical disc drive 111. It is assumed that the optical disk drive can be controlled by issuing an ATAPI (ATA Packet Interface) command as a command, for example.

  The optical disk drive 111 is an external optical disk drive, and is connected to the information recording / reproducing apparatus 100 via USB.

  The optical disc 112 is a disc that can be handled by the optical disc drive 111. For example, a CD-R, a CD-RW, a DVD-RAM, a DVD-R (including two layers), a DVD-RW, a DVD + R (including two layers). DVD + RW, Blu-Ray Disc, HD DVD, and the like.

  The operation and action of the information recording / reproducing apparatus 100 configured as described above will be described in detail below. The information recording / reproducing apparatus 100 according to the first embodiment includes an HDD, a microcomputer, an SDRAM (Synchronous DRAM), a flash ROM, a battery, a finder, a camera shake correction mechanism, a photographing light, etc. in addition to the above-described components. Assume that the camcorder includes the respective components that are generally included.

  First, recording / playback processing of video / audio data, which is a basic function as an HDD camcorder, will be described. The recording process is started when the user presses the shooting button provided in the input / output unit 101. When the shooting button is pressed, the input / output unit 101 notifies the system control unit 104 that the shooting button has been pressed. The system control unit 104 instructs the compression / decompression unit 102 to encode video data when conditions such as the free capacity of the HDD 103 and the number of already recorded contents match the shooting start conditions. If the shooting start condition is not met, the input / output unit 101 is notified to display a menu for notifying the user that shooting cannot be performed. The compression / decompression unit 102 encodes the video from the input / output unit 101 expanded in the frame memory and the audio from the microphone, multiplexes them, and outputs them to the SDRAM. The compression / decompression unit 102 appropriately records the data encoded and output on the SDRAM on the HDD 103.

  The recording process is stopped under conditions such as when the user presses a shooting stop button provided in the input / output unit 101, or when the storage capacity of the HDD 103 approaches a limit. At this time, the system control unit 104 notifies the compression / decompression unit 102 that encoding is stopped, generates management information for managing data recorded in the HDD 103, and records the management information in the HDD 103. The management information is information that summarizes the playback time for each content, aspect ratio, resolution, and the like, which are video attribute information.

  The reproduction process starts when the user presses a reproduction button provided in the input / output unit 101 or selects a content to be reproduced with the selection button. The display of the playback menu such as which content is to be played back to the user is such that the system control unit 104 instructs the input / output unit 101 based on the management information recorded in the HDD 103 to display a list of content. And When starting reproduction, the system control unit 104 instructs the compression / decompression unit 102 to reproduce the corresponding content. The compression / decompression unit 102 reads the corresponding content from the HDD 103 onto the SDRAM, demultiplexes and decodes the content, and outputs the decoded content to the input / output unit 101. For example, if the encoding method is MPEG-2, the decoding timing may be a timing according to a time stamp described in a picture or a frame which is a unit of video or audio. As a result, video and audio are output from the LCD monitor and speakers included in the input / output unit 101.

  The content recorded on the optical disc 112 is reproduced in that the compression / decompression unit 102 reads the content from the optical disc 112 via the drive control unit 110. However, the content format recorded on the HDD 103 and the content format of the optical disc 112 are different. Can be reproduced by the same method (such as the same encoding method).

  Next, a flow of processing for backing up content recorded on the HDD 103 to the optical disc 112 will be described. Hereinafter, in the present embodiment, description will be made assuming that content conforming to the DVD-Video standard is backed up to the optical disc 112 as an example. Accordingly, the maximum number of recording layers of the optical disk 112 is assumed to be two.

  The backup process starts when the user selects content to be backed up by operating a button provided in the input / output unit 101. Note that the menu display on the LCD monitor, such as a candidate list of contents to be backed up, is displayed by the system control unit 104 based on management information recorded in the HDD 103.

  When the content to be backed up is selected, the system control unit 104 notifies the backup control unit 105 to back up the corresponding content. The backup control unit 105 reads the corresponding content from the HDD 103 onto the SDRAM, converts the content into a format conforming to the DVD-Video standard, and notifies the drive control unit 110 to record data. The conversion process here includes, for example, provision of NV_PCK (Navigation pack). NV_PCK is unique to the DVD-Video standard and is a pack that always exists at the beginning of a VOBU (Video Object Unit). When the compression / decompression unit 102 encodes without assigning NV_PCK in advance during the recording process, it needs to be provided. Even if NV_PCK is assigned in advance, since NV_PCK includes jump destination information in VOB (Video Object), it is necessary to recreate NV_PCK depending on the content range selected by the user.

  Upon receiving the recording notification, the drive control unit 110 issues a WRITE command for recording data to the optical disc drive 111. Upon receiving the command, the optical disc drive 111 records content including NV_PCK on the optical disc 112.

  In addition, the backup control unit 105 records the content on the optical disc 112, and also generates and records content management information and file system information.

  In the case of the DVD-Video standard, content management information is VTSI (Video Title Set Information) including content attribute information for each VTS (Video Title Set) and playback unit information such as VOB and Cell, a menu for the entire disc, VMGI (Video Manager Information), which is information about the title and the like, corresponds to this. Since only one video attribute is allowed in one VTS, a new VTS is created each time the aspect ratio or resolution of the content to be backed up changes based on the management information recorded in the HDD 103. In addition, when creating a menu including a thumbnail of content, etc., it is necessary to record an image displaying a thumbnail of the content to be backed up as a VMGM (Video Manager Menu), but this is not described in detail.

  The file system information is management information compliant with the UDF (Universal Disk Format) standard, and includes file and directory entry information, partition information, and the like.

  When all the data has been recorded on the optical disc 112, the backup control unit 105 notifies the drive control unit 110 to perform finalization if the optical disc 112 is a disc that requires finalization. Finalization is a final process for making the optical disc 112 reproducible by other devices. Upon receiving the notification, the drive control unit 110 issues a command for finalization to the optical disc drive 111. The optical disc drive 111 receives the finalize command and finalizes the optical disc 112. When the finalization is completed, the completion of finalization is notified in the order of the drive control unit 110, the backup control unit 105, and the system control unit 104 from the optical disc drive 111. When finalization is completed, the system control unit 104 starts a verification process in order to confirm the reliability of the optical disk 112 that has been subjected to the backup process.

  Here, although it is assumed that the verify process is always performed after finalization, the present invention is not limited to this. For example, when the optical disk 112 is a DVD-RAM, it is known that the verify process may be performed on the optical disk drive 111 side. As described above, when the verification process is performed in advance or when the reliability of the optical disc drive 111 can be confirmed to be extremely high, the process may be terminated here. Further, when the user prohibits the execution of the verification process through menu setting or the like, the process may be terminated here.

  Next, the verify process will be described. FIG. 2 is a diagram showing the flow of verify processing. The verify process is started when the system control unit 104 notifies the recording layer selection unit 106 to start the process.

  When the process is started, the recording layer selection unit 106 initializes S, which is a value that holds the total value of the capacities of the recording layers, to 0 (step S501).

  Next, the drive control unit 110 is inquired about the number of recording layers of the optical disc 112 and the capacity of each recording layer (step S502). The drive control unit 110 issues a command for acquiring the number of recording layers of the optical disc 112 and the capacity of each recording layer to the optical disc drive 111. For example, if the optical disk 112 is a DVD-R dual-layer disk, a READ DISC STRUCTURE command is issued. Upon receiving a response to the command from the optical disc drive 111, the drive control unit 110 analyzes the response and returns the number of recording layers of the optical disc 112 and the capacity of each recording layer to the recording layer selection unit 106.

  Next, the recording layer selection unit 106 acquires the end address (END_ADR) of the content (step S503). This process will be described with reference to FIGS.

  FIG. 3 is a diagram showing an example of a logical volume space when the optical disc 112 is a single layer. It is assumed that the logical volume space starts with LBA (Logical Block Address) = 0 and physically ends with an outermost address (hereinafter referred to as an outermost address). The lead-in area and lead-out area are not shown. Inner physically indicates the inner periphery side of the disc, and Outer physically indicates the outer periphery side. The first Volume and File structure is a section including file system information, followed by VMG (Video Manager) and VTS. In this example, two VTSs are recorded.

  Among these, since the VTSI (for backup) of VTS # 2 is used when reproducing DVD-Video and has the largest address, this final address is END_ADR. In order to obtain END_ADR, the recording layer selection unit 106 reads the information of the VTSI (for backup) file system of VTS # 2 via the drive control unit 110, and obtains the final address. For example, since there is file entry information having a head address and a size for each file in UDF, the final address can be easily obtained.

  In this example, the method of setting the final address of the last recorded VTSI (for backup) to END_ADR is shown, but the present invention is not limited to this. For example, as shown in FIG. 4, when it is determined that non-standard unique information that is not used at the time of reproduction is always recorded last, the start address-1 (LB, Logical Block) of this unique information is set as END_ADR. Also good.

  In addition, END_ADR can be similarly obtained for a dual-layer disc such as a DVD-R.

  FIG. 5 is a diagram showing an example of a logical volume space when the optical disk 112 has two layers. The recording method between the first layer (L0) and the second layer (L1) in the figure is opposite, and addresses are logically continuous between L0 and L1 on the outer peripheral side. In this example, it is assumed that VTS # 3 is recorded across the first to second layers. In this case, the final address of VTSI (for backup) of VTS # 3 which is the last recorded VTS is END_ADR.

  Here, END_ADR has been described as being acquired from information on the file system of the optical disc 112, but an address corresponding to END_ADR may be held in SDRAM or the like in advance in the recording process described above.

  Next, in step S504 to step S506, the number of layers of data recorded on the optical disc 112 is determined. First, the capacity of the first layer obtained in step S502 is added to S (step S504). Then, S is compared with END_ADR + 1 (LB) (step S505). If END_ADR + 1 (LB) is greater than or equal to S, the second and subsequent layers are also recorded, so the process returns to step S504, and the capacity of the next recording layer (for example, L1) is added to S. If END_ADR + 1 is less than S, only the current recording layer has been recorded, so the number (N) of recording layers (hereinafter referred to as recorded layers) in which data is recorded is determined here. (Step S506).

  Next, a recorded layer to be verified is selected (step S507). In the present embodiment, it is assumed that all the recorded layers obtained in steps S504 to S506 are selected as the recording layers to be verified. For example, when N = 1, only L0 is selected, and when N = 2, L0 and L1 are selected.

  When the selection of the recording layer to be verified is completed, the recording layer selection unit 106 notifies the reference recording unit 107 of the selected recording layer. The reference address specifying unit 107 that has received the notification creates a verification reference table in a loop from step S508 to step S509. The verification reference table is a table that is a basis of a verification range table described later, and has at least a verification reference address. This loop starts from L0 and is repeated by the number of recorded layers selected in step S507.

First, it is determined whether or not it is the last recorded layer (step S508). If it is not the last recorded layer, the outermost peripheral address of the current recorded layer is added to the verification reference table as a verification reference address (step S509). .
The outermost peripheral address of the current recorded layer can be obtained from the capacity of each recording layer acquired in step S502. For example, if it is L0, it can be obtained from the capacity of the first layer minus 1 (LB), and if it is L1, it corresponds to the capacity of the first layer.

  If it is the last recorded layer, END_ADR is added to the verification reference table as a verification reference address (step S510). However, in the case of a disc having two or more recording layers, addresses start from the outer peripheral side in the case of odd-numbered recording layers such as L1, L3, L4, L5, L7. Therefore, when the last recorded layer is an odd-numbered recording layer, the outermost peripheral address is added to the verification reference table as a verification reference address. Further, when the outermost peripheral address is added to the verification reference address in steps S509 and S510, there is an unrecorded area, padding area (all 0s, etc.), unique information, etc. that are not used at the time of reproduction near the outermost peripheral address. In this case, an address that avoids this is set as the verify reference address. For example, in the example shown in FIG. 5, when VTS # 3 is not recorded continuously with VTS # 2, but VTS # 3 is recorded from the outermost peripheral address of L1, the final address of L0 from the last address of VTS # 2 is recorded. The area of the peripheral address needs to be filled with the padding area. Since such a padding area is not used at the time of reproduction, there is not much meaning to verify. Therefore, in this case, an address obtained by the size of the outermost peripheral address-Padding area of the verification reference address of L0 is set as the verification reference address. As a result, the verify reference address is set at the end of VTS # 2 while avoiding the padding area.

  6 and 7 show an example of the verification reference table created in steps S508 to S509. FIG. 5 is a diagram showing an example of the verification reference table created when the first layer of the dual-layer disc is recorded. In this case, END_ADR is set as a verification reference address in L0. FIG. 7 is a diagram showing an example of a verification reference table created when the second layer of the same dual-layer disc is recorded. In this case, respective outermost peripheral addresses are set in L0 and L1. As described above, it is important that the verification reference address of L0 differs depending on the amount of data recorded on the same disk.

  When the verification reference table is created in this way, the reference address specifying unit 107 notifies the verification range specifying unit 108 of the verification reference table.

  Upon receiving the notification, the verification range specifying unit 108 creates a verification range table based on the verification reference table (step S511). The verify range table is a table including at least a verify start address and a verify end address, and the verify range is specified thereby.

  The creation of the verification range table will be specifically described with reference to FIGS. FIG. 8 is an example of a verification range table created based on the verification reference table shown in FIG. The verification start address of P1, which is the verification range for L0, can be obtained by subtracting VERIFY_SIZE, which will be described later, from END_ADR, which is the verification reference address set in the verification reference table. The reason why VERIFY_SIZE is subtracted is because the address starts from the inner periphery. Further, when END_ADR-VERIFY_SIZE + 1 (LB) is a negative value, it means that no data equal to or higher than VERIFY_SIZE is recorded. In this case, 0 is set. The verify end address matches END_ADR.

  VERIFY_SIZE is a value indicating how much each recording layer is to be verified, and the larger the value, the wider the verification is performed, so that the reliability of the disc is improved. However, since VERIFY_SIZE and the time required for verification are in a proportional relationship, it is necessary to set an appropriate value. For example, when verifying 10% of the capacity of each recording layer, VERIFY_SIZE can be obtained by the capacity of each recording layer ÷ 10. When it is desired to complete the verify process within a certain time, VERIFY_SIZE can be obtained by time divided by transfer rate. The parameters for determining VERIFY_SIZE, such as the ratio and time, may be set to optimum values for each device characteristic (whether reliability is important or time is important). Further, by allowing the user to set such parameters via a menu, the verification process can be performed with a balance desired by the user.

  FIG. 9 is an example of a verification range table created based on the verification reference table shown in FIG. The verify start address of P1, which is the verify range for L0, can be obtained by subtracting VERIFY_SIZE from the L0 outermost peripheral address, which is the verify reference address set in the verify reference table. The verify end address matches the outermost peripheral address of L0. The verification start address of P2, which is the verification range for L1, matches the L1 outermost peripheral address set in the verification reference table. This is because the odd-numbered recording layer starts addressing from the outer periphery. The verify end address can be obtained by adding VERIFY_SIZE-1 (LB) to the L1 outermost peripheral address. However, if END_ADR is smaller than L1 outermost peripheral address + VERIFY_SIZE-1 (LB), it means that no data equal to or higher than VERIFY_SIZE is recorded in L1, and in this case, END_ADR is set.

  When the verification range table is created in this way, the verification range specifying unit 108 notifies the verification execution unit 109 of the verification range table.

  When the verification execution table 109 is notified of the verification range table, the verification execution unit 109 executes verification (step S512). The verification execution unit 109 extracts the verification ranges one by one from the notified verification range table, and notifies the drive control unit 110 to read the area from the verification start address to the verification end address from the optical disc 112. Upon receiving the notification, the drive control unit 110 issues a READ command for reading the area to the optical disc drive 111. If the optical disk drive 111 fails to read the optical disk 112 and returns a read error to the drive control unit 110, the verify execution unit 109 regards the recording on the optical disk 112 as abnormal and notifies the system control unit 104 of the abnormality. . Upon receiving the notification, the system control unit 104 notifies the input / output unit 101 to display a message on the LCD monitor for notifying that the backup process to the optical disc 112 is not normally performed. As a result, the user can know that the backup could not be performed normally.

  Note that although the verify execution unit 109 immediately notifies the system control unit 104 of an abnormality when there is a read error, the verification execution unit 109 is not necessarily limited to this. For example, when there is a read error, retry may be performed, or a predetermined number of read errors may be allowed. However, in this case, the reliability of the optical disk 112 is reduced as compared with the case where an error is notified immediately.

  The verification process performed by the verification execution unit 109 has been described as a so-called read verification in which data is read from the optical disc 112 and an error is confirmed. However, the verification processing is not limited to this. For example, what is called compare verify that compares the read data with the data recorded in the HDD 103 may be further performed.

  As described above, in the present embodiment, a recorded reference layer on which data is recorded is selected, a verification reference is obtained on the outermost side among data used at the time of reproduction, and verification is performed based on the verification reference address. Since the verification is performed by obtaining the range, the reliability of the disc can be confirmed by physically verifying the data on the outer peripheral side in each recording layer regardless of the recorded data area.

  In addition, since an address that avoids an area that is not used during reproduction is set as the verification reference address, only data that is used during reproduction can be verified.

(Embodiment 2)
In the first embodiment, it has been described that content conforming to the DVD-Video standard is backed up on an optical disc. Therefore, the maximum number of recording layers of the disc is two layers defined by DVD-R and DVD + R. In this embodiment, a case where a recorded layer closest to the surface of the recording surface is selected in a multi-layer disc will be described. A multi-layer recordable disc such as four layers or six layers is realized by Blu-Ray Disc. It is known to be possible. It is also possible that a disk having a further multilayer structure will appear due to future technological development. FIG. 10 shows an example in which a verification range is set for an 8-layer disc. In this example, it is assumed that data is recorded in all areas of the disc, and a verify range is set on the outer peripheral side of each recorded layer. As described above, if the verify range is set for all the recorded layers of the 8-layer disc and the verify is executed, it takes about eight times as long as verifying only one layer. If the verification is completed in the same time as when only one layer is verified, VERIFY_SIZE needs to be reduced to about 1/8.

  However, if VERIFY_SIZE is simply reduced, the distance verified from the outermost circumference to the inner circumference of the disc is reduced, so that the reliability against the degradation factor of the recording quality such as scratches and dirt on the recording surface of the disc is increased. descend.

  In this embodiment, an information recording / reproducing apparatus that selects and verifies a recorded layer closest to the surface of the recording surface of the disc will be described. It is known that a recording layer close to the surface is more susceptible to recording quality degradation factors such as disc scratches and dirt than a distant recording layer. Therefore, if a recorded layer close to the surface is selected and verified against scratches and dirt, the reliability is not greatly reduced even if the recorded layer farther than this is not verified.

  To select and verify only the recording layer close to the surface can be realized by selecting only the recorded layer closest to the surface in step S507 shown in FIG.

  Note that which recording layer is close to the surface differs depending on the type of the disc. For example, in the case of DVD-R, DVD + R, HD DVD, etc., L0 is the recording layer closest to the surface, so L0 may be selected. In the case of a Blu-Ray Disc, L0 is the recording layer farthest from the surface. For example, if data is recorded up to the fourth layer on a four-layer disc, L3 may be selected.

  As described above, in this embodiment, by selecting and verifying the recorded layer closest to the surface of the recording surface of the disc, even if the disc has a multi-layer structure, the time is maintained while maintaining the reliability of the verification. It can be shortened.

(Embodiment 3)
In the second embodiment, the case where the recorded layer closest to the surface of the recording surface of the disk is selected in the multilayered disk has been described. In this embodiment, the recording farthest from the surface of the recording surface of the disk is performed. A case of selecting a completed layer will be described.

  Data recording on the recording layer far from the surface is performed by passing laser light through the recording layer in front. Therefore, with respect to the influence of the previous recording layer, if the recorded layer far from the surface is selected and verified, the reliability will not be greatly reduced even if the recorded layer closer to this is not verified. .

  To select and verify only the recording layer far from the surface can be realized by selecting only the recorded layer far from the surface in step S507 shown in FIG. As described above, which recording layer is close to the surface.

  Although the present embodiment has been described on the assumption that only the recorded layer farthest from the surface of the recording surface of the disc is selected, the present invention is not limited to this. For example, as shown in the second embodiment, the most surface It is effective in terms of reliability if a recording layer close to is selected and verified.

  As described above, in the present embodiment, by selecting a recorded layer farthest from the surface of the recording surface of the disc and performing verification, even if the disc has a multi-layer structure, time is maintained while maintaining the reliability of verification. It can be shortened.

(Embodiment 4)
In the second embodiment and the third embodiment, the case where the recorded layer closest to or far from the surface of the recording surface of the disk is selected in the multilayer structure disk has been described. In the present embodiment, these layers are selected. A case where a recorded layer adjacent to the recorded layer is selected will be described.

  FIG. 11 is a diagram showing a case where data smaller than VERIFY_SIZE is recorded on the outer peripheral side of L6. Even if only the recorded layer close to the surface is selected and verified by the method shown in the second embodiment on the disk on which recording is performed as shown in this figure, the amount of data to be verified is small. In terms of reliability, it is insufficient. Such a problem similarly occurs even when only the recorded layer far from the surface is selected and verified by the method shown in the third embodiment.

  Therefore, if the amount of data recorded on the recorded layer near or far from the surface is less than VERIFY_SIZE, the recording layer adjacent to this is selected instead and verified. Verifying only the adjacent recording layer can be realized by selecting only the recording layer adjacent to the recording layer close to or far from the surface in step S507 shown in FIG. For example, in the example of FIG. 11, L6 is selected because L7 is the recording layer closest to the surface. As a result, the vicinity P1 of the outer periphery of L6 which is the adjacent recording layer is verified.

  As described above, in the present embodiment, when selecting a recorded layer closest to or far from the surface of the recording surface of the disc, an adjacent recorded layer is selected when the amount of recorded data is small. Therefore, the verification range does not change depending on the amount of recorded data, and the verification reliability can be maintained.

(Embodiment 5)
In the second embodiment and the third embodiment, the case where the recorded layer closest to or far from the surface of the recording surface of the disk is selected has been described, but in the present embodiment, the outer peripheral side compared to the other recording layers. A case where a recorded layer in which data is recorded is selected will be described.

  FIG. 12 is a diagram showing a case where padding areas are scattered around the outer periphery of each recording layer. As shown in the figure, if padding areas are scattered near the outer periphery, the method of selecting and verifying L0 that is closest to or farthest from the surface has a sufficient effect on the influence of the warp of the disk, fingerprints, etc. Not.

  Therefore, in this embodiment, a method for selecting and verifying a recording layer in which data is recorded to the outermost periphery will be described. In order to select and verify only the recorded layer in which data is recorded to the outermost circumference, it is realized by selecting only the recorded layer in which data is recorded to the outermost circumference in step S507 shown in FIG. can do. Which recorded layer has data recorded to the outermost periphery can be obtained in the same manner as the method (steps S508 to S510) for obtaining the verification reference table shown in FIG.

  In this embodiment, only the recorded layer in which data is recorded to the outermost periphery is selected and verified. However, the present invention is not limited to this, and for example, Embodiment 2 or Embodiment 3 is used. As shown in the above, it is effective in terms of reliability if a recorded layer closest to or farthest from the surface is further selected and verified.

  As described above, in the present embodiment, the recording layer in which data is recorded to the outermost periphery is selected and verified, so that it is not used at the outer periphery side of each recording layer in a multi-layer disc. Even when data is scattered, the time can be shortened while maintaining the reliability of verification.

  An information recording / reproducing apparatus according to the present invention has a function of ensuring the reliability of a disc regardless of the data area recorded on the disc, and an optical disc such as a digital camcorder that copies its contents to an external optical disc drive. This is useful in an apparatus for recording data.

FIG. 2 is a block diagram showing the configuration of the information recording / reproducing apparatus 100 according to the first embodiment. Diagram showing the flow of verification processing Diagram showing an example of logical volume space The figure which shows the example where original information is recorded last Diagram showing logical volume space in case of 2 layers The figure which shows the example of the verification reference | standard table in case the 1st layer of a 2 layer disc is recorded The figure which shows the example of the verification reference | standard table in case the 2nd layer of a 2 layer disc is recorded. The figure which shows the example of the verification range table at the time of recording to the 1st layer of a 2 layer disc The figure which shows the example of the verification range table at the time of recording on the 2nd layer of a 2 layer disc Figure showing an example of setting the verification range on an 8-layer disc The figure which shows the case where small data are recorded with respect to VERIFY_SIZE The figure which shows the case where a padding area | region is scattered.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Information recording / reproducing apparatus 101 Input / output part 102 Compression / decompression part 103 HDD
DESCRIPTION OF SYMBOLS 104 System control part 105 Backup control part 106 Recording layer selection part 107 Reference address specific | specification part 108 Verify range specific part 109 Verification execution part 110 Drive control part 111 Optical disk drive 112 Optical disk

Claims (5)

An information recording / reproducing apparatus for recording data on an optical disc having one or more recording layers and performing verification in order to confirm whether the recording is correct,
Recording means for recording data on the optical disc;
A recording layer selecting means for selecting a specific recording layer for verifying data recorded by the recording means;
In the specific recording layer selected by the recording layer selecting means, reference address specifying means for specifying an address physically located at the outer periphery as the reference address for verification among the addresses of data used at the time of reproduction;
Verify range specifying means for specifying a predetermined range based on the reference address specified by the reference address specifying means as a verify range;
A verification execution means for executing verification based on the verification range specified by the verification range specifying means;
An information recording / reproducing apparatus comprising:   2. The information recording / reproducing apparatus according to claim 1, wherein the specific recording layer is a recording layer closest to a surface of a recording surface among recording layers on which data is recorded.   2. The information recording / reproducing apparatus according to claim 1, wherein the specific recording layer is a recording layer farthest from the surface of the recording surface among the recording layers on which data is recorded.   The recording layer selection unit selects a recording layer adjacent to the specific recording layer when the data amount recorded in the selected specific recording layer is less than a predetermined size. The information recording / reproducing apparatus according to claim 3. 2. The information recording / reproducing apparatus according to claim 1, wherein the specific recording layer is a recording layer in which data used at the time of reproduction is recorded physically on the outer periphery of another recording layer.

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