KR100618994B1 - Method for verifying defect management area information of disc and test apparatus for performing the same - Google Patents

Abstract

The present invention discloses a method for verifying whether a defect management area (DMA) information is normally generated / updated during re-initialization with certification while verifying through a disc recording / reproducing apparatus, and a test apparatus for performing the same. do.

The method according to the present invention is a method for verifying a DMA information generation / update function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information, comprising: (a) testing reference information and physical Performing a reinitialization mode while verifying the recording / reproducing apparatus by using a test disk having a defect, and generating test information from the generated defect management information; (b) predicting by test reference information and physical defects; And comparing the standard information with the test information to provide verification results for the test information.

Therefore, when the disc recording / reproducing apparatus is operated in the reinitialization mode with certification, it is possible to easily determine whether the DMA generation / update function is normally performed.

Description

Method for verifying defect management area information of disc and test apparatus for performing the same

1 is a schematic structural diagram of a rewritable disc.

2 is a functional block diagram of a test apparatus according to the present invention.

3 is a diagram illustrating a defect structure of a C-2 test disc type.

4 is a detailed check list for verification of the verifier shown in FIG. 2.

Fig. 5 is a block diagram showing the relationship between the mirror file of the defect management area of the C-2 disc before reinitialization while verifying and the mirror file of the defect management area of the C-2 disc after reinitialization while verifying.

6 is a flowchart illustrating the operation of the verification method according to the present invention.

<Description of the symbols for the main parts of the drawings>

201: C-1 disk 203: DMA mirror file provider

205: reference disk drive 207: C-2 disk

209: Disc drive device for test 215: Verifier

The present invention relates to a device capable of recording / reproducing a disc capable of recording / reproducing. In particular, a device capable of recording / reproducing a disc is referred to as a defect management area (hereinafter, referred to as DMA) of the disc. The present invention relates to a method for verifying whether the system is normally generated / updated and a test apparatus for performing the same.

The above-described recordable / reproducible disc is an optical disc for recording and reproducing information by using a property of light such as a laser. For example, DVD-RAM (Digital Versatile Disc Random Access Memory, hereinafter referred to as DVD-RAM) is an example. have. This DVD-RAM is a rewritable disc. According to the "DVD Specifications for rewritable disc Part1 Physical Specifications version 2.0" standard, the above-described DVD-RAM has four DMAs (DMA1, DMA2, DMA3, DMA4) per side of the disk for managing defects on the disk. Done.

Of these four DMAs, DMA1 and DMA2 are located in the lead-in area adjacent to the inner diameter of the disk as shown in FIG. 1, and DMA3 and DMA4 are located at the outer diameter of the disk. It is located in an adjacent lead-out area. Each DMA is followed by reserved sectors.

Each of these DMAs stores a disc definition structure (weakly referred to as DDS), a primary defect list (weakly referred to as PDL) and a secondary defect list (weakly referred to as SDL). . The above-described DDS includes information on the formatted structure of the disc, such as a disc certification flag, a DDS / PLD update counter, and a starting logical sector number for each zone. The PDL contains information on all defective sectors on the disk found during disk initialization. The SDL contains the sector number and the defective block of the first sector of the defective block (1 error-correction code block) that occurred during disk use. And information about the sector number of the first sector of the spare blocks to be replaced and information about the spare area.

As such, the information stored in the DMA can be read and used immediately, but also includes information that changes according to the location and number of defects present on the disk, and through calculation based on the defect information registered in the DMA. Information obtained is also included. The information obtained through the calculation based on the defect information includes the location information of the start sector number or logical sector number 0 of each region.

Four DMAs per disk exist to prevent erroneous defect management due to errors in the DMA information. In addition, since the DMA information is closely related to the physical sector of data, a removable recording medium such as an optical disc has a problem of compatibility between disc recording / reproducing apparatuses when DMA information is incorrectly recorded and decoded. Will occur.

This includes the recording / playback layer of the disk recorder / player (eg DVD-RAM recorder), the filesystem layer, the host interface layer that connects the host computer and the recorder / player capable of recording and playback, and the physical signal. This is because recording and decoding of DMA information is performed under the physical disk recording / reproducing device layer when the recording is divided into a physical disk recording / reproducing device (or disk driving device) layer and a recording medium layer. .

That is, in the actual file system, only the logical sector number is used to transfer user information to be recorded or reproduced to the disc recording / reproducing apparatus, and the disc recording / reproducing apparatus replaces the logical sector number with a physical sector number to The recording or reproducing process is performed, at which time DMA information is used. Therefore, when DMA information is incorrectly decoded or recorded incorrectly by one disc recording / reproducing apparatus, there is a problem that data cannot be read or written correctly by another disc recording / reproducing apparatus.

Therefore, there is a need for a method capable of confirming whether a disc recording / reproducing apparatus correctly decodes DMA information recorded on a disc, and confirms that the DMA information is correctly generated and updated on the disc.

SUMMARY OF THE INVENTION The present invention has been made in accordance with the above-described demands, and is used to verify whether or not defect management area (DMA) information is normally generated / updated during re-initialization with certification while verifying through a disc recording / reproducing apparatus. The purpose is to provide a method for this.

It is another object of the present invention to test-based defect management in which all kinds of defect information are present in a disc and a primary defect list in which physical defects exist when re-initializing through a disc recording / reproducing apparatus. The present invention provides a method for verifying whether defect management area (DMA) information of a disk created by using a DMA mirror file is normally generated / updated.

Another object of the present invention is to provide a test apparatus for confirming whether defect management area information is normally generated / updated during re-initialization while verifying through a disc recording / reproducing apparatus.

In order to achieve the objects to be achieved by the present invention, a method according to the present invention is directed to a method for verifying DMA information generation / update function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information. (a) performing a re-initialization mode of the recording / reproducing apparatus using the test disc having the test reference information and the physical defect, and then generating test information from the generated defect management information; (b) Comparing the test reference information and the test information and the test information predicted by the physical defects to provide a verification result for the test information.

In order to achieve the objects to be achieved by the present invention, an apparatus according to the present invention is for testing a DMA information generation / update function of a recording / reproducing apparatus capable of recording / reproducing a disc having a defect management area (DMA) information. An apparatus, comprising: a test disk having test reference information and a physical defect; A reference disc drive device for generating test information from a defect management area of the test disc after performing a reinitialization mode while verifying in the recording / reproducing apparatus by using the test disc; It is desirable to include a verifier that verifies the test result by comparing the test information with the predicted reference information based on the test reference information and the physical defect information.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

2 is a functional block diagram of a test apparatus for a disc recording / reproducing apparatus according to the present invention, wherein a C-1 disc 201, a defect management area (abbreviated as DMA) a mirror file is shown. Providing unit 203, reference drive 205, C-2 disc 207, drive to be tested 209, C-2 'disc 211, C-2 'disk DMA mirror file 213 and verifier 215.

The C-1 disc 201 tests a disc drive device capable of recording / reproducing information on a disc that can be recorded again, such as a DVD-RAM (Digital Versatile Disc Random Access Memory). The test disc is designed to exist artificially with physical defects. Therefore, the physical defects present in the C-1 disc 201 are used as information that is known in advance when testing a desired disc drive. In addition, the C-1 disc 201 is subjected to the DVD-RAM condition of the phase change recording method having a capacity of 4.7 GB (Giga Bytes) specified in the "DVD specification for Rewritable disc version 2.0 standard" for a disc which can be rewritten. The disk is configured to satisfy.

As shown in FIG. 1, the DMA mirror file providing unit 203 includes a disk definition structure (hereinafter referred to as DDS), a primary defect list (hereinafter referred to as PDL) and a secondary defect list (hereinafter referred to as SDL). In addition, a DMA mirror file is provided as test reference information that satisfies a condition where a supplementary spare area (hereinafter, referred to as SSA) is not full.

In particular, it provides a test reference DMA mirror file configured to have all kinds of defects in the PDL. That is, a P-list consisting of information on defective sectors defined by the disc manufacturer in the PDL, a G1-list consisting of information on defective sectors found during the disc's certification processing period, and without certification. It provides a test reference DMA mirror file containing all G2-lists consisting of information about defective sectors moved from the SDL.

In addition, in order to enhance the test effect, when re-initialization is performed in the disk drive device 209 to be tested, a test reference DMA mirror file including defect information at a special location is provided so as to satisfy a condition where error is most likely to occur. . In other words, as illustrated in FIG. 3, a test reference DMA mirror file including defect information configured to concentrate error sectors around a physical sector where a first logical sector should be located is provided. DVD Specifications for rewritable disc Part1 Physical Specifications version 2.0 "Specification meets all cases of the algorithm.

In addition, the first sector and the last sector of each zone are treated as errors, and the remaining sectors are generated by setting a defective sector so that the sum of the available sectors of each zone is not 16 multiples. Provide a test criteria DMA mirror file configured to: The above-described mirror file is a file having the same contents as the actual file but physically existing at a location different from where the actual file can be located.

The reference disc drive unit 205 is a modified test disc drive unit for testing a device capable of recording / reproducing information on a disc. When the C-1 disk 201 is installed and the test reference DMA mirror file is provided from the DMA mirror file providing unit 203, the reference disk drive unit 205 replaces the provided test reference DMA mirror file with the C-1 disk 201. And C-2 disc 207 recorded on the back panel. At this time, the DMA mirror file recorded on the C-1 disk 201 is recorded regardless of the physical defects present in the C-1 disk 201. Accordingly, the C-2 disc 207 is a disc in which the above-described test reference DMA mirror file information is recorded while there is a physical defect existing in the C-1 disk 201. The C-2 disk 207 is a disk configured to satisfy the condition of a DVD-RAM of a phase change recording method having a capacity of 4.7 GB (Giga Bytes) like the C-1 disk 201.

In addition, the reference disk drive 205 is a DMA recorded on the installed C-2 'disk 211 when a C-2' disk 211 that has been verified and re-initialized with certification, which will be described later, is installed. The information is read directly, and the DMA mirror file 213 of the read C-2 'disk is output as test information. In this case, the test information may be some information existing in the C-2 'disk DMA mirror file 213.

The disc drive device 209 to be tested is a disc recording / reproducing device capable of recording / reproducing information on a disc which can be recorded again. When the C-2 disk 207 configured as described above is installed, the test target disk drive 209 performs a process of re-initialization with certification. As a result, the DMA information carried on the C-2 disc 207 is generated / updated. That is, when the C-2 disk 207 is verified and reinitialized by the test target disk drive 209, the reference DMA information contained in the C-2 disk 207 is present in the C-1 disk 201. It is created / updated with DMA information considering physical defects.

Therefore, when the C-2 disk 207 is installed, the test target disk drive 209 generates the C-2 'disk 211 in which the DMA information generated / updated as described above is recorded. The generated C-2 'disk 211 is installed in the reference disk drive unit 205 so that the DMA mirror file recorded on the C-2' disk 211 can be output as test information as described above. The test information output from the reference disk drive 205 is provided to the verifier 215. The providing method may be implemented to be directly provided by the reference disk drive 205.

The verifier 215 uses the C-2 'by using the reference information predicted to be obtained when the disk to be tested 209 decrypts / updates normally when re-initializing the C-2 disk 207. The disk DMA mirror file 213 is verified. The predicted reference information is set in the verifier 215 in consideration of the test reference DMA mirror file provided from the DMA mirror file providing unit 203 and the physical defect information present in the C-1 disc 201 provided beforehand, or FIG. 4. The DMA information table as shown in FIG. Can be provided and used in advance.

4A is a check list that may be included in the verifier 215 for DMA verification, including an error condition of DMA, a DDS / PDL and SDL update counter, and DMA contents. ) Items, etc.

The DMA error status item checks whether an error exists in the DMA existing in the lead-in area and the lead-out area, respectively. The errors are not corrected in the four DMA1, DMA2, DMA3, and DMA4. If an uncorrected error is found in any one of the DMAs, the verification result may indicate that the disk drive under test 209 fails to create / update the DMA of the C-2 disk 207. So that it is output. The output method can be implemented in the form of displaying the failure so that the user can recognize. If the DMA creation / update fails in this way, the user must retry the test from the beginning using a new test disc.

DDS / PDL and SDL update counter items are tested while re-initializing, DDS / PDL update counter values in four DDS1, DDS2, DDS3 and DDS4 and DDS / PDL update counters in four SDL1, SDL2, SDL3 and SDL4. It is checked whether the "M + k" value representing the value has a value by which "M" is "previous value" and "k" is "2". This is because the DDS / PDL update counter value is incremented by 1 each time the DDS / PDL is updated or rewritten. Then, it is checked whether all eight DDS / PDL update counter values present in DMA1, DMA2, DMA3, and DMA4 are the same.

In addition, the value by which "N + k" value which shows the SDL revision counter value in four places SDL1, SDL2, SDL3, SDL4 is "N" is "previous value" and "k" is "2" Check if it has This is because the SDL update counter value is also incremented by 1 each time the SDL is updated or rewritten. Then, it is checked whether four SDL update counter values are the same.

Also, it is checked whether the DMA contents of the four places (DMA1, DMA2, DMA3, DMA4) are all the same.

FIG. 4B is a check list that may be included in the verifier 215 to verify the DDS structure, and includes a DDS identifier, a Disc Certification flag, a DDS / PDL update counter, and a number of groups ( Number of Groups, Number of zones, Location of Primary spare area, Location of first logical sector number (Location of LSN0), Location of starting logical sector number of each zone (Start LSN for each zone).

That is, it is checked whether the DDS identifier is "0A0Ah", and it is checked whether the value of the bit position b7 indicating whether it is in-progress among 1-byte disk verification flags is "0b". At this time, if the value of the bit position b7 is "0b", the formatting is completed, and if "1b", the formatting is in progress, and if "1b", the verifier 215 recognizes that the formatting has failed. Further, it is checked whether all of the reserved bit positions b6 to b2 are "0b" among the disk verification flags, checks whether the value of the bit position b1 indicating the user verification flag is "1b", and indicates the bit position indicating the disk manufacturer verification flag. Check if the value of b0 is "1b".                     

To check the DDS / PDL update counter, it is checked whether the value of M representing the DDS / PDL update counter is the "previous value" and the value of k representing the increment of the counter is "2". It checks whether it is "0001h" and "0023h" which indicates whether there are 35 regions.

Also, it is checked whether the first sector number of the initial free space is "031000h" and the sector number of the last sector is "0341FFh", and the position of the first logical sector number LSN0 is determined by the number of defects registered in the PDL. Check if it is decided. Then, it is checked whether the starting logical sector number of each region, that is, each starting logical sector number of the second region (Zone 1) to the 35th region (Zone 34) is determined by the number of defects registered in the PDL. Here, the defect registered in the PDL takes into account both the physical defect existing on the C-1 disk 201 and the defect registered in the PDL of the reference DMA mirror file provided by the DMA mirror file providing unit 203. .

Also, it is checked whether all remaining spare areas (byte positions 396 to 2047) of the DDS structure are "00h".

Check items for checking the PDL structure include a PDL identifier, a number of entries in the PDL, an Integrity of PDL entry, and an unused area as shown in FIG. 4C. Un-used area).

That is, it is checked whether the PDL identifier is "0001h", and the number of items in the PDL is a physical defect of the C-1 disk 201 and a defect included in the PDL of the reference DMA mirror file provided from the DMA mirror file provider 203. Indicative of the number, the configuration state of each PDL item checks the item type and defective sector number. Here, the PDL item type checks whether the PDL item type has "00b" indicating a known P-list existing in the C-2 disc 207 and "10b" indicating G1_list which is a defect sector generated during user verification. The sector number checks whether the sector number is written in ascending order from high order.

When checking the item type of the PDL, not checking for G2_list means that the C-2 disk 207 of the C-2 disk 207 is shown as shown in FIG. The P_list 511 in the old PDL 510 present in the DMA remains intact, while the G1-list 513 and G2-list 515 are disposed and subjected to the testing of the C-2 disk 207. The defect found by this is because the C-2 'disk 211 having the new PDL 530 registered in the G1-list 533 is generated. At this time, the G1-list 533 should include all the information on the defective sector of the C-1 disk 201. This is to determine whether the disc drive device 209 under test normally verifies a defective sector intentionally created on the C-1 disc 201.

Then, it is checked whether an unused PDL area is "FFh".

As shown in FIG. 4D, check items for checking the SDL structure include an SDL identifier, an SDL update counter, a start sector number of SSAs of secondary free space, and a logical sector. Total number of logical sectors, DDS / PDL update counters, Spare area full flag, Number of entries in SDL, Integrity of SDL entries , Unused SDL area, and so on.

That is, to check whether the SDL identifier is "0002h", and to verify the SDL update counter item, whether the N value representing the SDL update counter is "previous value" and the value of k representing the increment value of the counter is "2". Check it. To verify the DDS / PDL update counter item, it is checked whether the M value representing the DDS / PDL update counter is the "previous value" and the k value representing the increment value of the counter is "2".

In addition, the free space pool flag checks whether or not the secondary free space is full, and checks whether the number of items in the SDL is set to " 0 " indicating that there is no general. In addition, since information should not exist in the byte position indicating the configuration state of the SDL item and the free space state, it is checked whether it is set to "00h" and "FFh" indicating unused free space. This is because the old SDL 520 existing in the C-2 disk 207 is arranged as shown in FIG. 5 when re-initialization is normally performed by the test target disk drive 209.

However, if the defect found by the test of the C-2 disk 207 overflows the area allocated to the G1_list 533, the exceeded defect is the new SDL 540 of the C-2 'disk 211. Is registered). Therefore, under the condition that an overflow occurs in G1_list 533 for the found defect, it should be checked whether defect information having an entry type of G1_list exists in the configuration state of the SDL item.

The verifier 215 compares the reference information set as shown in FIG. 4 with the information present in the C-2 'disk DMA mirror file 213 and checks the C-2 disk upon re-initialization while the disk drive device 209 is tested. It is verified whether or not the DMA of (207) is normally generated / updated. The verified result is output as a test result for the verified and re-initialized mode of the test target disk drive 209. The output method may be implemented to be displayed in a form that can be recognized by the user. To this end, the device according to the present invention can be implemented to further include a separate display means. Accordingly, the user may determine whether the DMA of the installed disk is normally decoded and whether the defect information generated in the DMA is normally generated / updated when the disk drive device 209 under test performs the reinitialization mode.

6 is an operational flow diagram of a verification method according to the present invention, in which the DMA mirror file having the same conditions as in FIG. 2 described above is provided in the C-1 disc 201 having the same conditions as in FIG. To record the C-2 disc 207. Then, in step 602, the C-2 disk 207 is installed in the disk drive device 209 to be tested to perform the process of re-initializing the C-2 disk 207.

Then, the DMA mirror file recorded on the C-2 'disk 211 reinitialized in step 603 is read out, and the DMA mirror file 213 read out in step 604 is verified. Verification is performed using the same predicted reference information (or expected values) as made in the verifier 215 of FIG. 2 described above. When the verification is completed, the verification result is output in step 605 so that the user can evaluate the DMA generation / update function for the disk drive 209 to be tested.

As described above, the present invention uses a C-1 disk having a physically fixed defect and a C-2 generated using a test-based DMA mirror file including all kinds of defects such as P_list, G1_list and G2_list in the PDL. After re-initialization with certification of the disk drive under test, verify the test information based on the obtained C-2 'disk DMA mirror file to verify the DMA of the disk drive to be tested. By obtaining the test results for the decryption / recording function, it is easy to test the DMA creation / update function of the disk drive that can record / reproduce information on the disk, and it is most likely to cause errors when re-initialization is performed. "DVD Specifications for rewritable disc Part1 Physical Specifications version 2.0" If you have satisfied all of the algorithms presented in the document it can perform the validation and testing.

In addition, users can directly create C-2 discs containing P_list, G1_list, and G2_list in the PDL by using the standard DMA mirror file, so that the manufacturer can make and provide test discs for C-2 discs separately. Can be prevented.

Claims (47)

A method for verifying the DMA information generation / update function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information, the method comprising: (a) performing a re-initialization mode of the recording / reproducing apparatus using a test disc having test reference information and a physical defect, and then generating test information from the generated defect management information; (b) comparing the test information with the test information and the test information predicted by the physical defect and providing a verification result of the test information. The test disk of claim 1, wherein the test disk includes defect information at a position capable of satisfying a condition that is likely to cause an error when the reinitialization mode of step (a) is performed. The test disk is configured to treat the first sector and the last sector of each zone as an error and not add 16 times the sum of the available sectors in each region, And the test reference information of step (a) comprises one of a mirror file type and a defect management area mirror file type. delete delete delete The method of claim 1, wherein the test criteria information comprises a defect management area mirror file (DMA mirror file) configured to have all kinds of defects in a primary defect list (PDL), The predicted reference information of the step (b) is. In the case where the recording / reproducing apparatus verifies the test disc and the reinitialization mode is normally performed, the recording / reproducing apparatus is set to information that can be obtained based on the information of the defect management area mirror file and the physical defect information. Verification method. delete delete 7. The verification according to claim 6, wherein the verification in step (b) checks whether the P-list is preserved and whether there are intentionally defective sectors present in the test disk in the G1 list. And checking whether there is no entry in the secondary defect list (SDL). delete delete delete delete delete delete delete delete delete delete delete delete The method of claim 1, wherein the method is (c) recording the test reference information on the disk having the physical defect irrespective of the physical defect to generate the test disk. The verification method as claimed in claim 1, wherein the test information of the step (a) is read directly from a defect management area of the re-initialized disk. The method of claim 1, wherein the method is and (c) displaying the verification result as a test result of the DMA generation / update function of the recording / reproducing apparatus. An apparatus for testing the DMA information generation / update function of a recording / reproducing apparatus capable of recording / reproducing a disc having defect management area (DMA) information, the apparatus comprising: A test disk having test reference information and physical defects; A reference disc drive device for generating test information from a defect management area of the test disc after performing a reinitialization mode while validating in the recording / reproducing apparatus using the test disc; And a verifier for comparing the test information and the test information predicted based on the test reference information and the physical defect information to verify the test result. delete 26. The apparatus of claim 25, wherein the reference disk drive device further comprises a function of writing the test reference information on the disk having the physical defect irrespective of the physical defect to generate the test disk. Testing device. 26. The test disk according to claim 25, wherein the test disk has defect information at a position that can satisfy a condition that is likely to cause an error when the re-initialization is performed in the recording / reproducing apparatus. And the test disc is configured to treat the first sector and the last sector of each zone as an error and not add 16 times the sum of the available sectors of each zone. delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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