JP2008034036A - Information recording medium, information recording and reproducing device, and information recording and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information recording medium in which expansion can be performed for increment of types holding expression form and compatibility of type discrimination information of an existing DVD. <P>SOLUTION: In the information recording medium in which a disk type discrimination code specifying a kind of a disk is recorded in the prescribed area, the disk type discrimination code is provided with a first disk type discrimination code specifying a kind of a disk classified to a first group, a second disk type discrimination code specifying a kind of a disk classified to a second group, and a judgement flag validating either of the first disk type discrimination code and the second disk type discrimination code and invalidating the other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an information recording medium, an information recording / reproducing apparatus, and an information recording / reproducing method, and in particular, an information recording medium such as a DVD, an information recording / reproducing apparatus for reproducing a DVD, etc. Regarding the method.

  Today, optical discs as information recording media are used in various fields. In particular, a DVD (Digital Versatile Disk) has a significantly increased storage capacity compared to a CD (Compact Disk), so that it is used as a recording medium for an information processing apparatus such as a personal computer, and as a recording medium for various video and audio. Widely used.

  Recently, high-density DVDs such as HD DVDs, which have a larger storage capacity than conventional DVDs, have entered the practical stage.

  There are several “types” of conventional DVDs (hereinafter simply referred to as “DVDs”) and HD DVDs.

  As the “type” of the DVD, a read-only DVD-ROM, a write-once type (a user can write once) DVD-R or DVD + R, a rewritable DVD-RW, a DVD + RW, or a DVD- There are RAM and the like.

  Also, as the “type” of HD DVD, there are playback-only HD DVD-ROM, write-once HD DVD-R, HD DVD-RW that can be rewritten a plurality of times, and HD DVD-RAM.

  For DVD and HD DVD, there are standards corresponding to each “type”, and the data format, recording and playback method, etc. are stipulated in this standard, and the contents differ depending on the “type”. Yes. Therefore, in order to properly record or properly reproduce data on a DVD or HD DVD, a data format suitable for each “type”, a recording / reproducing method, and the like are required.

  For this reason, identification information for specifying the “type” is recorded in advance in a predetermined area of the DVD or HD DVD, and this identification information is read by the disk drive device and the “type” of the inserted disc is recorded. The method to identify is taken.

  Non-Patent Document 1 discloses a standard document corresponding to each of the above “types”. For example, “ECMA262” is disclosed as a DVD-ROM standard document, “ECMA359” is disclosed as a DVD-R standard document, and the like. These standards specify identification information for specifying the “type” of the DVD and the recording location on the disc.

  Specifically, a 1-byte (8-bit) identification information recording area called “Disk Category and Version Number” is provided in a specific area called a lead-in area on the disk. In this recording area, 4-bit “disc category” information for specifying “type” is recorded together with “version number” information (4 bits).

The “disc category” information is information for specifying the “type” of the disc such as “ROM”, “−R”, “+ R”, “RAM”, etc., and the “version number” information corresponds to the version number of the standard document. Information.
Ecma International “Index of Ecma Standards”, [online], [searched July 19, 2006], Internet <URL: http://www.ecma-international.org/publications/standards/Stnindex.htm>

  As described above, in the current standard, a 4-bit code is assigned to the “disc category” information for specifying the “type” of the disc. Further, of the 4 bits, the upper 1 bit is assigned exclusively to the “+ R” type disk and the “+ RW” type disk.

  Therefore, in the remaining 3 bits, the other four types of DVD (DVD-ROM, DVD-R, DVD-RW, and DVD-RAM) and the four HD DVD types (HD DVD- ROM, HD DVD-R, HD DVD-RW, and HD DVD-RAM).

  That is, only the “type” of the existing disk has already used up 4 bits of the “disc category” information. Therefore, the current identification information expression form has a problem that when a new “type” disk appears in the future, the “type” cannot be expressed.

  The present invention has been made in view of the above circumstances. Type identification information that can be easily expanded with respect to an increase in new “types” while maintaining compatibility with an expression form of type identification information of an existing DVD. And an information recording / reproducing apparatus for recording / reproducing the information recording medium, and an information recording / reproducing method for recording / reproducing the information recording medium.

  In order to solve the above problems, an information recording medium according to the present invention is an information recording medium in which a disc type identification code for specifying a disc type is recorded in a predetermined area, and the disc type identification code is a first group. A first disc type identification code for identifying the type of disc classified into the second group, a second disc type identification code for identifying the type of disc classified into the second group, and the first disc type identification code. And a determination flag that validates one of the second disk type identification codes and invalidates the other.

  In order to solve the above-described problem, an information recording / reproducing apparatus according to the present invention is based on a disc type determination unit that determines the type of an inserted information recording medium, and the type determined by the disc type determination unit. A disc type identification code recorded in a predetermined area of the information recording medium in the information recording / reproducing apparatus comprising: an information reproducing / recording unit that reproduces the information recording medium or records the information on the information recording medium; A first disk type identification code for identifying the type of the disk classified into the second group, a second disk type identification code for identifying the type of the disk classified into the second group, and the first disk type A determination flag for validating one of the identification code and the second disc type identification code and invalidating the other, and The disc type determination unit determines the type of the information recording medium based on a code that is valid by the determination flag among the first disc type identification code and the second disc type identification code. It is characterized by that.

  In order to solve the above-mentioned problem, the information recording / reproducing method according to the present invention determines the type of the inserted information recording medium, and based on the type determined by the disc type determining unit, the information recording medium In the information recording / reproducing method, the disc type identification code recorded in a predetermined area of the information recording medium specifies the type of the disc classified into the first group. 1 disc type identification code, a second disc type identification code for identifying the type of disc classified into the second group, and any of the first disc type identification code and the second disc type identification code A determination flag for validating one of them and invalidating the other, and the first disk type identification code and the second data Of disk type identification code, it determines the type of the information recording medium based on who code of the determination flag is valid, characterized in that.

  According to the information recording medium, the information recording / reproducing apparatus, and the information recording / reproducing method according to the present invention, while maintaining compatibility with the expression form of the type identification information of the existing DVD, the new “type” is increased. But it can be easily expanded.

  Embodiments of an information recording medium, an information recording / reproducing apparatus, and an information recording / reproducing method according to the present invention will be described with reference to the accompanying drawings.

(1) Information Recording Medium FIG. 1 is a diagram illustrating a configuration example of the information recording medium 100 according to the present embodiment. The information recording medium 100 is, for example, a conventional DVD or a high density recording type HD DVD.

  Most of the area of the information recording medium 100 is occupied by a “data area”, in which various information data, audio / image data, and the like are recorded. On the inner periphery and outer periphery of the “data area” of the conventional DVD, areas called “lead-in area” and “lead-out area” are provided.

  On the other hand, HD DVD has an area called “system lead-in area” on the inner periphery side of the disc, and a “lead-in area” equivalent to that of a conventional DVD is provided inside. Similarly, there is an area called “system lead-out area” on the outer peripheral side of the disc, and a “lead-out area” equivalent to that of a conventional DVD is provided in the area.

  Identification information for specifying the type of discs (conventional DVD and HD DVD) is recorded in the “lead-in area” of these areas.

  FIG. 2 is a diagram illustrating a data structure example of a “lead-in area”. As shown in FIG. 2A, the “lead-in area” has an area called “Control Data Zone”, in which an area for recording 2048-byte “Physical format information” is provided. (See FIG. 2 (b)).

  In “Physical format information”, various information and parameters necessary for reproducing or recording on the disc are recorded. In this “Physical format information”, identification information called “Disk Category and Version Number” for identifying the type of the disk is included as 1-byte (8-bit) data.

  Although the types of information and parameters included in "Physical format information" vary depending on the type of disk, this "Disk Category and Version Number" is common to all disks. .

  FIG. 2B and FIG. 3 are diagrams showing bit allocation of “Disk Category and Version Number” that has been conventionally used.

  The upper 4 bits of “Disk Category and Version Number” represent the disk type (disk category), and the lower 4 bits represent the version number of the standard that defines the detailed specifications of each type.

  The 16 types of disk identification information can be expressed by the upper 4 bits of the “Disk Category and Version Number”. Among these, the 8 types with the most significant bit (b7) “1” are “+ R”. ”And“ + RW ”type disks have already been assigned or reserved. For this reason, it is necessary to identify other types of discs by using a code “0 ***” in which the most significant bit (b7) is “0”.

  At present, a total of 8 types of 4 types as conventional DVDs and 4 types as HD DVDs have already been standardized. Specifically, as the upper 4 bits representing the four types of conventional DVD, DVD-ROM is “0000”, DVD-R is “0010”, DVD-RW is “0011”, Also, “0110” is assigned to the DVD-RAM and standardized.

  Similarly, bit assignments represented by “0 ***” other than the above have already been standardized as four types of HD DVDs: HD DVD-ROM, HD DVD-R, HD DVD-RW, and HD DVD-RAM. Yes.

  As described above, the eight types that can be expressed by the code “0 ***” are all assigned to the already standardized type disks.

  On the other hand, the version number of the lower 4 bits of “Disk Category and Version Number” is also updated with the version update of the standard even if the disk is the same type. The most significant bit (b3) of the bits is unused and is “0”.

  Recently, even if the version is updated, the version number of the lower 4 bits of “Disk Category and Version Number” is fixed, and the actual version number is recorded in another area of “Physical format information”. It is stipulated.

  The point of the present invention is that, while maintaining compatibility with a code (first disk type identification code) that identifies the type of a disk that has already been standardized (disks classified into the first group), it will be newly added in the future. The point is to provide a disc type identification code that also includes a code (second disc type identification code) that identifies the type of the disc that appears (discs classified into the second group).

  FIG. 4 is a diagram showing an example of the disc type identification code according to the first embodiment of the present invention. In the first embodiment, the disk type identification code is shared with the conventional “Disk Category and Version Number” code.

  That is, the existing “Disk Category and Version Number” bit assignment is used as the disk type identification code, and the upper 4 bits are assigned the code identifying the current disk type (first disk type identification code) as it is. In this embodiment, the determination flag (b3) and the second disc type identification code (b2 to b0) are assigned to the lower 4 bits.

  As described above, “b3” of the existing type “Disk Category and Version Number” is unused and “0” is assigned. Therefore, when “b3” is “0”, the disk drive device is determined to be an existing type disk, and when “b3” is “1”, it is determined to be a new type disk. Can be made. Thus, unused “b3” can be used as a “judgment flag” between an existing type and a new type.

  When “b3” is “1”, a new disk type code (second disk type identification code) expressed by 3 bits of “b2”, “b1”, and “b0” is further read Specific types can be identified.

  When “b3” is “0”, this means that the disk type identification code has the same content as the conventional “Disk Category and Version Number”. Therefore, in this case, the upper 4 bits are read to identify the specific type, and the version number is read from the lower 4 bits.

  According to the disk type identification code according to the present embodiment, when the determination flag “b3” is “0”, the existing type can be identified by the same process as the conventional “Disk Category and Version Number”, and compatible. Sex is secured. On the other hand, when the determination flag “b3” is “1”, it can be extended to the identification of a new disk type, and the identification information is converted into the lower 3 bits (“b2”, “b1”, “ b0 "), the processing is simplified.

  FIG. 5 is a diagram illustrating an example of a disc type identification code according to the second embodiment. The difference from the first embodiment is that the upper 4 bits are set to “0000” when the determination flag “b3” is “1”.

  As described above, “0000” is assigned as the type identification code of the existing DVD-ROM (read only). For this reason, if “1” of the determination flag “b3” indicating a new type is erroneously read as “0” and the upper 4 bits are read, it is recognized as a DVD-ROM (read only), It is not recognized as a recordable DVD (DVD-R, DVD-RW, etc.). As a result, it is possible to prevent the disk from being destroyed by irradiating a strong laser for recording.

  FIG. 6 is a diagram illustrating an example of a disc type identification code according to the third embodiment. The disk type identification code according to the third embodiment includes a conventional “Disk Category and Version Number” code, a determination flag using “b3” as a part thereof, and other “Physical format information” And a code for a new disc type (second disc type identification code) using the above-mentioned area.

  “Physical format information” has a total of 2048 bytes, and there may be an area that can be used as a spare. In this case, this spare area can be allocated to the recording area of the second disc type identification code. In the third embodiment, when the determination flag of “Disk Category and Version Number” is “1”, it is necessary to read the second disk type identification code in another area. Since a wider area can be used as compared with the second embodiment, a large number of identification codes can be secured.

  FIG. 7 is a diagram illustrating an example of a disc type identification code according to the fourth embodiment. In the fourth embodiment, not only the second disk type identification code but also a determination flag is provided in the spare area of “Physical format information”.

  As described above, “b3” of “Disk Category and Version Number” is not currently used, but if this bit is used for some reason and cannot be used as a determination flag as a result, this embodiment is effective. It is.

(2) Information Recording / Reproducing Device and Information Recording / Reproducing Method FIG. 8 is a diagram illustrating a configuration example of the information recording / reproducing device 1 that reproduces the information recording medium 100 described above or records data on the information recording medium 100.

  An information recording / reproducing apparatus 1 includes a motor 2 that rotationally drives an information recording medium 100, a pickup 3 that reads or writes recorded information from the information recording medium 100, an RF amplifier 4 that amplifies the read reproduction signal to a predetermined level, and a reproduction signal. The reproduction unit 51 for demodulating the data and extracting the reproduction data, the interface 6 for outputting the reproduction data to the host computer 200, the overall control of the information recording / reproducing apparatus 1, the control unit 7 having the disc type determination unit 70, the host computer Is provided with a recording unit 50 or the like for converting recording data output from the recording data into a predetermined recording signal. The reproducing unit 51 and the recording unit 50 constitute the information reproducing / recording unit 5.

  FIG. 9 is a flowchart showing an example of an information recording / reproducing method of the information recording / reproducing apparatus 1 configured as described above.

  When the information recording medium 100 is set in the information recording / reproducing apparatus 1, first, the first disc type identification code, the determination flag, and the second disc type identification code are read (step ST1, step ST2).

  For example, in the disc type identification code shown in FIG. 4, the upper 4 bits (b7 to b4) are read as the first disc type identification code, “b3” is read as the determination flag, and the lower 3 bits (b2 to b0). Is read as the second disc type identification code.

  Next, the disk type determination unit 70 of the control unit 7 determines the determination flag. If the determination flag is “1” (YES in step ST3), the second disk type identification representing the new disk type is determined. It is determined that the code is valid (step ST4). Thereafter, based on the disc type specified by the read second disc type identification code, the set information recording medium 100 is reproduced or recorded (step ST5).

  On the other hand, if the determination flag is “0” (NO in step ST3), it is determined that the second disk type identification code is invalid (step ST6), and is specified by the read first disk type identification code. The set information recording medium 100 is reproduced or recorded based on the disc type (existing disc type) (step ST7).

  As described above, according to the present embodiment, the compatibility with the expression form of the type identification information of the existing DVD can be maintained, and the expansion can be easily performed for a new type increase.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, the constituent elements over different embodiments may be appropriately combined.

The figure which shows the structural example of the information recording medium which concerns on one Embodiment of this invention. The figure which shows the data structure example and recording location of the disc type identification code recorded on an information recording medium. The figure which shows the data structure of the conventional disc type identification code, and the content of bit assignment. FIG. 3 is a diagram showing an example of a data structure of a disc type identification code in the information recording medium according to the first embodiment of the present invention. The figure which shows the data structure example of the disc type identification code in the information recording medium which concerns on the 2nd Embodiment of this invention. The figure which shows the data structure example of the disc type identification code in the information recording medium which concerns on the 3rd Embodiment of this invention. The figure which shows the data structure example of the disc type identification code in the information recording medium which concerns on the 3rd Embodiment of this invention. The figure which shows the structural example of the information recording / reproducing apparatus which concerns on one Embodiment of this invention. The flowchart which shows the process example of the information recording / reproducing method which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information recording / reproducing apparatus 3 Pickup 4 RF amplifier 5 Information reproduction | regeneration recording part 6 Interface 7 Control part 70 Disc kind determination part 100 Information recording medium

Claims (21)

In an information recording medium in which a disc type identification code for identifying a disc type is recorded in a predetermined area,
The disc type identification code is
A first disc type identification code that identifies the type of disc classified into the first group;
A second disc type identification code that identifies the type of disc classified into the second group;
A determination flag for validating one of the first disc type identification code and the second disc type identification code and invalidating the other;
Configured with
An information recording medium characterized by the above. The disc type identification code is
Upper 4 bits representing the first disc type identification code;
A 1-byte code composed of the lower 4 bits,
The determination flag and the second disc type identification code are expressed using the lower 4 bits.
The information recording medium according to claim 1. The most significant bit of the lower 4 bits is the determination flag. When this determination flag is “1”, the first disk type identification code is invalidated, while the second disk type identification code is changed. Valid,
The information recording medium according to claim 2. If the determination flag indicates that the first disc type identification code is invalid and the second disc type identification code is valid, all four bits of the first disc type identification code are added. Set to “0”,
The information recording medium according to claim 2, wherein the information recording medium is a recording medium. The disc type identification code is
A 1-byte code composed of upper 4 bits and lower 4 bits representing the first disc type identification code;
The second disk type identification code provided in a different area from the area in which the 1-byte code is provided; and
The determination flag is provided in the lower 4 bits of the 1-byte code.
The information recording medium according to claim 1. The disc type identification code is
A 1-byte code composed of upper 4 bits and lower 4 bits representing the first disc type identification code;
The second disc type identification code provided in a different area from the area in which the 1-byte code is provided;
The determination flag provided in an area different from an area in which the 1-byte code and the second disc type identification code are provided;
The information recording medium according to claim 1, comprising: The types of discs classified in the first group are DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD + RW, DVD-RAM, HD DVD-ROM, HD DVD-R, HD DVD-RW, and Any type of HD DVD-RAM, and the types of discs classified in the second group are other types.
The information recording medium according to claim 1. A disc type determining unit for determining the type of the inserted information recording medium;
An information reproducing / recording unit for reproducing or recording the information recording medium on the information recording medium based on the type determined by the disc type determining unit;
In an information recording / reproducing apparatus comprising:
The disc type identification code recorded in a predetermined area of the information recording medium is
A first disc type identification code that identifies the type of disc classified into the first group;
A second disc type identification code that identifies the type of disc classified into the second group;
A determination flag for validating one of the first disc type identification code and the second disc type identification code and invalidating the other;
Configured with
The disc type determination unit
A type of the information recording medium is determined based on a code that is valid by the determination flag among the first disc type identification code and the second disc type identification code;
An information recording / reproducing apparatus. The disc type identification code is
Upper 4 bits representing the first disc type identification code;
A 1-byte code composed of the lower 4 bits,
The determination flag and the second disc type identification code are expressed using the lower 4 bits.
The information recording / reproducing apparatus according to claim 8. The most significant bit of the lower 4 bits is the determination flag. When this determination flag is “1”, the first disk type identification code is invalidated, while the second disk type identification code is changed. Valid,
The information recording / reproducing apparatus according to claim 9. If the determination flag indicates that the first disc type identification code is invalid and the second disc type identification code is valid, all four bits of the first disc type identification code are added. Set to “0”,
The information recording / reproducing apparatus according to claim 9 or 10, The disc type identification code is
A 1-byte code composed of upper 4 bits and lower 4 bits representing the first disc type identification code;
The second disk type identification code provided in a different area from the area in which the 1-byte code is provided; and
The determination flag is provided in the lower 4 bits of the 1-byte code.
The information recording / reproducing apparatus according to claim 8. The disc type identification code is
A 1-byte code composed of upper 4 bits and lower 4 bits representing the first disc type identification code;
The second disc type identification code provided in a different area from the area in which the 1-byte code is provided;
The determination flag provided in an area different from an area in which the 1-byte code and the second disc type identification code are provided;
The information recording / reproducing apparatus according to claim 8, comprising: The types of discs classified in the first group are DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD + RW, DVD-RAM, HD DVD-ROM, HD DVD-R, HD DVD-RW, and Any type of HD DVD-RAM, and the types of discs classified in the second group are other types.
The information recording / reproducing apparatus according to claim 8. Determine the type of information recording medium inserted,
Based on the type determined by the disc type determination unit, the information recording medium is reproduced or recorded on the information recording medium,
In an information recording / reproducing method comprising:
The disc type identification code recorded in a predetermined area of the information recording medium is
A first disc type identification code that identifies the type of disc classified into the first group;
A second disc type identification code that identifies the type of disc classified into the second group;
A determination flag for validating one of the first disc type identification code and the second disc type identification code and invalidating the other;
Configured with
A type of the information recording medium is determined based on a code that is valid by the determination flag among the first disc type identification code and the second disc type identification code;
An information recording / reproducing method. The disc type identification code is
Upper 4 bits representing the first disc type identification code;
A 1-byte code composed of the lower 4 bits,
The determination flag and the second disc type identification code are expressed using the lower 4 bits.
The information recording / reproducing method according to claim 15. The most significant bit of the lower 4 bits is the determination flag. When this determination flag is “1”, the first disk type identification code is invalidated, while the second disk type identification code is changed. Valid,
The information recording / reproducing method according to claim 16. If the determination flag indicates that the first disc type identification code is invalid and the second disc type identification code is valid, all four bits of the first disc type identification code are added. Set to “0”,
The information recording / reproducing method according to claim 16 or 17, characterized in that: The disc type identification code is
A 1-byte code composed of upper 4 bits and lower 4 bits representing the first disc type identification code;
The second disk type identification code provided in a different area from the area in which the 1-byte code is provided; and
The determination flag is provided in the lower 4 bits of the 1-byte code.
The information recording / reproducing method according to claim 15. The disc type identification code is
A 1-byte code composed of upper 4 bits and lower 4 bits representing the first disc type identification code;
The second disc type identification code provided in a different area from the area in which the 1-byte code is provided;
The determination flag provided in an area different from an area in which the 1-byte code and the second disc type identification code are provided;
The information recording / reproducing method according to claim 15, comprising: The types of discs classified in the first group are DVD-ROM, DVD-R, DVD + R, DVD-RW, DVD + RW, DVD-RAM, HD DVD-ROM, HD DVD-R, HD DVD-RW, and Any type of HD DVD-RAM, and the types of discs classified in the second group are other types.
The information recording / reproducing method according to claim 15.

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