JP2004030742A - Optical disk storage medium for storing data related to firmware, optical disk information recording / reproducing device, and storage medium for storing firmware update program - Google Patents

Abstract

An object of the present invention is to make tampering difficult while using a rewritable optical disk recording medium to increase security.
A rewritable optical disk storage medium having a data area including a file management area, an area management area, and a file data area, and storing data related to firmware. At the beginning of the unused portion of the file, firmware identification information, firmware index information, and actual data are stored as firmware-related data.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk information recording / reproducing apparatus for recording / reproducing a video having an optical disk apparatus for recording / reproducing data on / from an optical disk recording medium such as a CD, DVD, MO, etc. The present invention relates to an optical disk information recording / reproducing apparatus capable of easily updating a microcomputer control program (herein, only the control program is referred to as “firmware”).
[0002]
[Prior art]
The CD standardized as a reproduction optical disk recording medium for music has been expanded in terms of the standard thereafter, and has been expanded to include a CD-ROM (for reproduction only), a CD-R (recordable only once), and a CD-RW (recording for a plurality of times). An optical disk recording medium such as a personal computer (hereinafter, referred to as “personal computer”) is used and widely used for an external storage device of a personal computer (hereinafter, referred to as a “personal computer”). In addition, DVD is standardized as the next media of CD, and DVD-VIDEO, DVD-AUDIO, DVD-ROM is used as read-only media, and DVD-R, DVD-RW, DVD-RAM, DVD + RW, etc. are becoming popular as recording media. is there. In particular, DVD-R, DVD-RW, DVD-RAM, and DVD + RW as recording media are expected as media for video recording / reproducing devices for homes using MPEG2 for video signals.
[0003]
A conventional example will be described with reference to FIGS. 6 is a diagram showing a schematic configuration of an optical disk device, FIG. 7 is a diagram showing a schematic configuration of a personal computer incorporating the optical disk device, and FIG. 8 is a schematic configuration of an optical disk information recording / reproducing device incorporating the optical disk device. FIG.
[0004]
FIG. 6 shows a schematic configuration of a conventionally known optical disk device.
[0005]
In FIG. 6, an optical disk device 20 includes a mounting portion 1 on which an optical disk recording medium 21 is mounted and driven to rotate, a spindle motor 2, a servo control circuit 3, a read / write head 4, a reproduction signal processing circuit 5, It comprises an error correction circuit 6, a buffer memory 7, a host interface 8, a recording signal processing circuit 9, an error correction code adding circuit 10, a control microcomputer 11, a flash ROM 12, and a RAM 13. The mounting unit 1 is driven to rotate by a spindle motor 2 controlled by a servo control circuit 3. The read / write head 4 is controlled by the servo control circuit 3 to seek to a desired position.
[0006]
When reading the optical disk information, a read signal is read from the optical disk recording medium 21 of the mounting section 1 using the read / write head 4, and the read signal processing circuit 5 detects digital data. The detected digital data is accumulated in a buffer memory 7 after an error due to noise or the like during reproduction is corrected by an error correction circuit 6. The stored data is sequentially output according to a request from the host interface 8. When writing optical disk information, digital data is sequentially stored in the buffer memory 7 in accordance with a request from the host interface 8. The accumulated digital data is added with an error correction code by an error correction code adding circuit 10, and is input to the recording signal processing circuit 9 in synchronization with the rotation of the mounting section 1. The digital data output from the recording signal processing circuit 9 is converted into a signal for writing, and is recorded from the read / write head 4 on the optical disk recording medium 21 of the mounting section 1.
[0007]
A flash ROM 12, which is an electrically rewritable ROM, and a RAM 13 are connected to the control microcomputer 11, and firmware for controlling the operation of the optical disk device 20 is stored in the flash ROM 12. Digital data necessary for control is read and written by the control microcomputer 11 via the buffer memory 7. When operating the optical disk device 20, the control microcomputer 11 reads out firmware from the flash ROM 12 and sends out control signals to each circuit (indicated by dotted lines in the figure). The program may be read out from the RAM 13 having a high reading speed and then executed.
[0008]
A personal computer incorporating the optical disk device 20 described above has been conventionally known. FIG. 7 shows a schematic configuration thereof.
[0009]
7, the personal computer includes an optical disk device 20, a microprocessor 41, a bus control circuit 42, a memory 43, a hard disk device 44, a drive interface 45, a general-purpose bus 46, an input interface 47, and a graphic interface 48. And a network interface 49. The microprocessor 41 is connected to a memory 43 and a general-purpose bus 46 such as a PCI bus via a bus control circuit 42, and various interfaces are connected to the general-purpose bus 46. The interfaces include an input interface 47 to which a keyboard and a mouse are connected, a display interface 48 to which a display monitor is connected, a network interface 49 to which a network is connected, and a drive interface 45 to which the hard disk device 44 and the optical disk device 20 are connected. Etc. Examples of the drive interface 45 include SCSI (Small Computer System Interface), IDE (Integrated Device Electronics), and the like. The optical disk device 20 has a host interface 8 (see FIG. 6) connected to a drive interface 45, and exchanges control information and digital data with a main part of a personal computer via the drive interface 45.
[0010]
When digital data is written to the optical disk recording medium 21 by a personal computer, the digital data stored in the memory 43 or the like is output to the optical disk device 20 via the general-purpose bus 46 and the drive interface 45 in accordance with an instruction from the microprocessor 41. When reading digital data from the optical disk recording medium 21, the digital data is read from the optical disk device 20 via the drive interface 45 and the general-purpose bus 46 and stored in the memory 43 according to the instruction of the microprocessor 41, or the display interface 48. Alternatively, it is output from the network interface 49.
[0011]
By the way, when the optical disk device 20 used in the personal computer has a problem or needs to be improved in performance after shipment, the firmware stored in the flash ROM 12 is changed. The firmware has been changed by executing the update program on an OS (operating system) of a personal computer. The firmware update program has been obtained from the optical disk recording medium 21 such as a CD-ROM via the optical disk device 20 or from the network via the network interface 49 in the hard disk device 44 of the personal computer. . When changing the firmware, the update program stored in the hard disk device 44 is read out, executed by the microprocessor 41, and transmitted to the optical disk device 20 via the drive interface 45 in a communication scheme predetermined with the optical disk device 20. The contents are transferred to the optical disk device 20, and the control microcomputer 11 receives the contents of the firmware via the host interface 8 and the buffer memory 7, and writes and updates the firmware in the flash ROM 12 by itself.
[0012]
An optical disk information recording / reproducing apparatus for recording / reproducing a video incorporating the optical disk apparatus 20 is also conventionally known. FIG. 8 shows a schematic configuration thereof.
[0013]
8, the optical disk information recording / reproducing apparatus includes an optical disk device 20, a host microcomputer 31, a video conversion circuit 32, a memory 33, various interfaces 34 to 36, and a tuner 37. Various interfaces include an input interface 34 to which a remote controller and operation switches are connected, a video output interface 35 to which a television monitor is connected, a video signal from an external video device, or a video from a tuner 37 to which an antenna is connected. And a video input interface 36 to which a signal is input. A video conversion circuit 32 is connected between the optical disc device 20 and the video output interface 35 and the video input interface 36. The host microcomputer 31 controls the operation of the optical disk information recording / reproducing device.
[0014]
When writing video data to the optical disk recording medium 21 with the optical disk information recording / reproducing apparatus, the video data is fetched from the video input interface 36, compressed and converted into MPEG data by the video conversion circuit 32, and transferred to the optical disk device 20. The information is written and recorded on the recording medium 21. When reading video data from the optical disc recording medium 21, the MPEG data read from the optical disc recording medium 21 is transmitted from the optical disc device 20, expanded and converted into video data by the video conversion circuit 32, and transmitted via the video output interface 35. Output to a TV monitor or the like to display the video.
[0015]
[Problems to be solved by the invention]
Since a dedicated machine such as the optical disk information recording / reproducing apparatus described above does not have a general-purpose program execution environment like a personal computer, it cannot execute the update program. Therefore, a non-rewritable dedicated optical disk recording medium 21 on which new firmware is recorded is sent to the user from the manufacturer of the dedicated machine, and the firmware is updated on the user side. Examples thereof include JP-A-11-3219 and JP-A-2001-229028. However, once the firmware-dedicated optical disk recording medium 21 is used, it becomes unnecessary thereafter. Therefore, every time the firmware is updated, the unnecessary optical disk recording medium 21 is increased, which is problematic in terms of resource saving. In order to solve this, it is conceivable to use a rewritable optical disk recording medium 21 such as a CD-RW or a DVD-RW. However, if the firmware data is recorded as a file on the rewritable optical disk recording medium 21 in accordance with a well-known file system, it can be accessed by a third party including a user, and may be tampered with. There is.
[0016]
The present invention has been made to solve the above-described problem, and has as its object to make tampering difficult while using a rewritable optical disk recording medium 21 to increase security.
[0017]
[Means for Solving the Problems]
To achieve the above objectives,
The invention according to claim 1 is
A rewritable optical disk storage medium having a data area including a file management area, an area management area, and a file data area and storing data related to firmware,
After initialization in advance, at the beginning of the file unused portion of the file data area, firmware identification information, firmware index information and actual data are stored as data relating to firmware,
The invention according to claim 2 is
The optical disc recording medium according to claim 1,
In the area management area indicating the free status of the file data area, the used state is stored in a place corresponding to the part storing the data related to the firmware,
The invention according to claim 3 is:
In the optical disk recording medium according to claim 1 or claim 2,
It is characterized by storing a manufacturer name, a model name, and a version number as firmware index information,
The invention according to claim 4 provides:
An optical disc information recording / reproducing device having an optical disc device, a host microcomputer, a memory, a video conversion circuit, and various interfaces,
The host microcomputer reads the actual data of the file existing at the head of the file unused portion of the file data area of the optical disk recording medium read by the optical disk device, and if the firmware identification information is present and the target firmware is present, The firmware is updated by writing actual data of the firmware to the optical disk device,
The invention according to claim 5 is:
An optical disk information recording / reproducing apparatus according to claim 4,
The host microcomputer writes actual data of the firmware to the optical disk device, and then initializes the optical disk device using the updated firmware,
The invention according to claim 6 is:
An optical disk information recording / reproducing apparatus according to claim 4,
After the host microcomputer writes the actual data of the firmware to the optical disk device, the used state of the area corresponding to the part storing the data related to the firmware in the area management area is rewritten to the unused state,
The invention according to claim 7 is:
In the optical disk information recording / reproducing apparatus according to claim 4,
An optical disc device having electrically rewritable nonvolatile memory means, and writing actual data of firmware to the memory means;
The invention according to claim 8 is:
A storage medium storing a computer program,
A step in which the computer program reads file system management information of the optical disk recording medium, a step of reading actual data of a file existing at the head of a file unused portion of a file data area of the optical disk recording medium, and a step of determining whether firmware identification information is present. Determining whether there is information about the target firmware in the firmware index information; and writing the actual data of the firmware to the optical disk device when the target firmware is present, and A firmware update program comprising an update step;
The invention according to claim 9 is:
A storage medium storing the computer program according to claim 8,
The computer program is a firmware update program having a step of initializing an optical disk device using the updated firmware after the step of updating the firmware,
The invention according to claim 10 is
A storage medium storing the computer program according to claim 8,
The computer program is a firmware update program having a step of rewriting a used state of a place corresponding to a portion of the area management area corresponding to the firmware data after the step of updating the firmware to an unused state. And
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the optical disk recording medium 21 and the optical disk information recording / reproducing apparatus of the present invention will be described with reference to FIGS.
[0019]
Before that, the normal optical disk recording medium 21, its data configuration, the data configuration immediately after the file format, and the data configuration at the time of file storage will be described with reference to FIGS. FIG. 9 is a diagram showing a normal optical disk recording medium 21, FIG. 10 is a diagram showing the normal data structure, FIG. 11 is a diagram showing the normal data structure immediately after the file format, and FIG. FIG. 4 is a diagram showing a normal data configuration when storing a file.
[0020]
As shown in FIG. 9, the recording area of the ordinary optical disk recording medium 21 is divided into a lead-in area, a data area, and a lead-out area in order from the inner periphery, as shown in FIG. Then, from the inner circumference, a block address number is assigned to each block having a determined data size. In the lead-in area, disk compatibility information required for disk compatibility and drive control is recorded. The start position of the data area and the start position of the lead-out area are recorded in the lead-in area. FIG. 10 shows a normal data configuration in which the inner circumference to the outer circumference of the optical disk recording medium 21 are represented in the order of block address numbers. When using the optical disk recording medium 21 in an optical disk information recording / reproducing apparatus, it is necessary to perform initialization so that a file can be recorded in advance. As a format for recording a file, a file system such as UDF (Universal Disc Format) is used. When the file format of the optical disk recording medium 21 is initialized, the normal data structure is as shown in FIG. That is, as a data area, a file management area in which the name, date and time, size, etc. relating to a file or directory are written, an area management area in which the usage status (empty information) of the data area is written, and actual data of the file are actually stored. A file data area is formed. At least one bit is allocated to the area management area corresponding to all block address numbers, and a used / unused flag is written. Immediately after the initialization, the portion used as the management area is flagged as in use. FIG. 12 shows a normal data configuration of the optical disk recording medium 21 when a normal file is recorded. FIG. 12 shows a state where two files are stored. When the file is created, information is created in the file management area, the actual data of the file is recorded in the file data area, and the information is used in the area corresponding to the file data area in which the actual data is stored in the area management area. A flag indicating the state is set. The file management information and the area management information recorded in the file management area and the area management area are called file system management information.
[0021]
As described above, the normal optical disc recording medium 21 reads the file management information and the area management information, which are the file system management information written in the data area, and reads the actual data of the file accurately based on the management information. Like that.
[0022]
On the other hand, according to the present invention, the file management information is not written in the file management area, and the firmware identification information, the firmware index information, and the actual data are provided at the head of the unused portion of the file data area after the format initialization. The firmware data is written, and the actual data of the firmware is accurately read using the identification information and index information in the firmware data as substantial file management information. In short, according to the present invention, the actual file management information is not written in the file management area as usual, but is added to the actual data of the firmware in the file data area where the actual data of the file is written. is there. (Each configuration of "firmware data" and "firmware index information" will be described later with reference to FIGS. 3 and 4.)
Next, an embodiment of the optical disk recording medium 21 and the optical disk information recording / reproducing apparatus of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a data structure when firmware is stored in an optical disk recording medium 21 according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a data structure when firmware is stored in an optical disk recording medium 21 according to a second embodiment of the present invention. FIG. 3 is a diagram showing a data structure of the firmware according to the embodiment of the present invention. FIG. 4 is a diagram showing a data structure of the firmware index information of the embodiment of the present invention. FIG. 14 is a diagram showing a flowchart of an operation for updating firmware in the optical disc information recording / reproducing apparatus according to the third embodiment of the present invention.
[0023]
In the first embodiment of the present invention, as shown in FIG. 1, firmware data including firmware identification information, firmware index information, and actual data is stored in a file in a file data area of the optical disk recording medium 21 after the format is initialized. It is recorded at the beginning of the unused part. No information is created in the file management area.
[0024]
In the second embodiment of the present invention, as shown in FIG. 2, the firmware data including the firmware identification information, the firmware index information, and the actual data is stored in the file data area of the optical disk recording medium 21 after the initialization of the format. In addition to recording the unused portion at the head, a flag indicating the use state is set at a location in the area management area corresponding to the file data area storing the firmware. No information is created in the file management area.
[0025]
FIG. 3 shows an example of the configuration of firmware data according to the present invention. FIG. 3 shows an example in which a plurality of firmware are recorded. The firmware data includes firmware identification information, firmware index information, and actual data of each firmware. The firmware identification information includes a keyword indicating that firmware data is stored, the size of the firmware data, and the like. FIG. 4 shows an example of the data configuration of the firmware index information. The firmware index information includes, for example, a maker name, a model name, a firmware version number, a storage location of the firmware, and the like.
[0026]
The operation of updating the firmware in the optical disc information recording / reproducing apparatus according to the third embodiment of the present invention will be described with reference to the flowchart of FIG.
[0027]
In the optical disk information recording / reproducing apparatus, the control microcomputer 11 of the optical disk device 20 starts operation when the optical disk recording medium 21 is inserted, and controls the drive recorded in the lead-in area of the optical disk recording medium 21 in step S1. Read necessary disk control information. Subsequently, in step S2, the host microcomputer 31 determines the name, date and time, size, and the like of the files and directories recorded in the file management area, and the usage status (free information) of the data area recorded in the area management area. The file system management information is read, and by using this information, the actual data (including “firmware data”) of the file written at the beginning of the unused portion of the file data area in step S3 is read and stored in the memory 33. . Subsequently, the host microcomputer 31 determines whether or not the firmware identification information is present in the file data area in step S4. If it is determined that there is no firmware identification information, the process proceeds to step S5 to perform a normal recording / reproducing process. If it is determined that there is firmware identification information, the firmware index information is read in step S6, and it is determined in step S7 whether the corresponding maker name and model name are present. If there is no corresponding name, the process proceeds to step S8 to rewrite the area management information corresponding to the file data area in which the firmware is stored to an unused state, and proceeds to step S5 to perform a normal recording / reproducing process. If there is a corresponding name, it is determined in step S9 whether the version number in the firmware index information is newer than the current version. If the firmware version number is older than or equal to the current version, the process proceeds to step S8 to rewrite the area management information corresponding to the file data area storing the firmware to an unused state, and then proceeds to step S5 to perform normal recording and reproduction. Perform processing. If the firmware version number is newer than the current version, the target firmware is read in step S10, and the actual data of the firmware is transferred to the optical disk device 20 by a predetermined communication method with the optical disk device 20. Next, in step S11, the control microcomputer 11 receives actual firmware data from the host microcomputer 31 via the host interface 8 and the buffer memory, and writes and updates the firmware in the flash ROM 12. Finally, in step S12, the area management information corresponding to the file data area in which the firmware of the optical disk recording medium 21 is stored is rewritten to an unused state, and the optical disk device 20 is initialized using the program updated in step S13. End the operation.
[0028]
【The invention's effect】
As described above, according to the present invention, the actual file management information is not written in the file management area as usual, but is written together with the actual data of the firmware in the file data area in which the actual data of the file is written. However, there is an effect that it is difficult for a third party to falsify the file management information while using the rewritable optical disk recording medium 21 and the security can be increased without knowing where the file management information is located.
[Brief description of the drawings]
FIG. 1 is a diagram showing a data structure when firmware is stored in an optical disc recording medium 21 according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a data configuration when firmware is stored in an optical disc recording medium 21 according to a second embodiment of the present invention.
FIG. 3 is a diagram showing a data configuration of firmware according to the embodiment of the present invention.
FIG. 4 is a diagram showing a data configuration of firmware index information according to the embodiment of the present invention.
FIG. 5 is a flowchart showing an operation of updating firmware in an optical disc information recording / reproducing apparatus according to a third embodiment of the present invention.
FIG. 6 is a diagram showing a schematic configuration of a conventional example of an optical disk device.
FIG. 7 is a diagram showing a schematic configuration of a conventional example of a personal computer.
FIG. 8 is a diagram showing a schematic configuration of a conventional example of an optical disk information recording / reproducing apparatus.
FIG. 9 is a diagram showing a normal optical disk recording medium 21.
FIG. 10 is a diagram showing a normal data configuration of an optical disk recording medium 21.
FIG. 11 is a diagram showing a normal data configuration immediately after a file format of an optical disc recording medium 21;
FIG. 12 is a diagram showing a normal data structure when a file is stored in the optical disc recording medium 21.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 mounting section 2 spindle motor 3 servo control circuit 4 read / write head 5 reproduction signal processing circuit 6 error correction circuit 7 buffer memory 8 host interface 9 recording signal processing circuit 10 error correction code adding circuit 11 control microcomputer 12 flash ROM
13 RAM
Reference Signs List 20 optical disk device 21 optical disk recording medium 31 host microcomputer 32 video conversion circuit 33 memory 34 input interface 35 video output interface 36 video input interface 37 tuner 41 microprocessor 42 bus control circuit 43 memory 44 hard disk device 45 drive interface 46 general-purpose bus 47 input interface 48 Graphic interface 49 Network interface

Claims (10)

A rewritable optical disk storage medium having a data area including a file management area, an area management area, and a file data area and storing data related to firmware,
An optical disk recording medium characterized by storing firmware identification information, firmware index information, and actual data as firmware-related data at the beginning of a file unused portion of a file data area after initializing in advance. The optical disc recording medium according to claim 1,
An optical disc recording medium characterized in that a used state is stored in a location corresponding to a portion in which data relating to firmware is stored in an area management area indicating an empty state of a file data area. In the optical disk recording medium according to claim 1 or claim 2,
An optical disc recording medium storing a maker name, a model name, and a version number as firmware index information. An optical disc information recording / reproducing device having an optical disc device, a host microcomputer, a memory, a video conversion circuit, and various interfaces,
The host microcomputer reads the actual data of the file existing at the beginning of the file unused portion of the file data area of the optical disk recording medium read by the optical disk device, and if the firmware identification information is present and the target firmware is present, An optical disk information recording / reproducing apparatus characterized in that actual data of firmware is written to an optical disk device to update the firmware. An optical disk information recording / reproducing apparatus according to claim 4,
An optical disk information recording / reproducing apparatus characterized in that a host microcomputer writes actual data of firmware to an optical disk apparatus, and then initializes the optical disk apparatus using the updated firmware. An optical disk information recording / reproducing apparatus according to claim 4,
Optical disc information recording characterized in that after the host microcomputer writes actual firmware data to the optical disc device, the used state of the area corresponding to the portion of the area management area that stores the firmware data is rewritten to the unused state. Playback device. In the optical disk information recording / reproducing apparatus according to claim 4,
An optical disk information recording / reproducing apparatus characterized in that an optical disk device has electrically rewritable nonvolatile memory means, and writes actual data of firmware into the memory means. A storage medium storing a computer program,
A step in which the computer program reads file system management information of the optical disk recording medium, a step of reading actual data of a file existing at the head of a file unused portion of a file data area of the optical disk recording medium, and a step of determining whether firmware identification information is present. Determining whether there is information about the target firmware in the firmware index information, and writing the actual data of the firmware to the optical disk device when the target firmware is present, and A storage medium storing a computer program, which is a firmware update program including a step of performing an update. A storage medium storing the computer program according to claim 8,
A storage medium storing a computer program, wherein the computer program is a firmware update program having a step of initializing an optical disk device using the updated firmware after the step of updating the firmware. A storage medium storing the computer program according to claim 8,
The computer program is a firmware update program having a step of rewriting a used state of a place corresponding to a portion of the area management area where data relating to firmware is stored to an unused state after the step of updating the firmware. Storage medium storing a computer program to be used.

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