JP4734215B2 - Recording method and optical disk recording apparatus - Google Patents

Description

  The present invention relates to an optical disk recording method and apparatus, and more particularly to a recording method and apparatus for recording digital data on a write-once optical disk.

  As an example of an apparatus for recording and reproducing digital data on a recording medium, there is a DVD-RAM recording / reproducing apparatus (optical disk recording / reproducing apparatus) defined by the international standard ECMA-272 or the like.

  This DVD-RAM optical disc recording / reproducing apparatus is an optical disc recording / reproducing apparatus that is first recorded in a disc management information area (DMA) arranged in the lead-in and lead-out when a disc is inserted or powered on. The disc management information data is read to check whether the DVD-RAM has been physically formatted. If it is not physically formatted, it waits until there is a physical format instruction from the host device.

  When the DVD-RAM has been physically formatted, the DVD-RAM optical disc recording / playback apparatus performs a recording preparation process such as a calibration process and logical consistency verification, and then waits for an instruction from the host apparatus. When the DVD-RAM optical disc recording / reproducing apparatus receives some “command” from the host device, it examines the meaning, and if it is a recording processing command, performs recording processing of user data, and if it is a reproducing processing command Performs a reproduction process of converting the recorded data on the DVD-RAM into user data again and outputting it. In the case of an instruction such as disk ejection, corresponding processing is performed.

  In a normal DVD-RAM recording / reproducing apparatus, in the process of recording user data, the recording data is actually reproduced from the DVD-RAM and the recording quality is confirmed in order to determine whether or not the recording can be normally performed after the recording. As a result, the reliability of the optical disk is improved by performing a replacement process in which user data is arranged in the spare area instead of the user area as necessary.

  The correspondence information between the user area and the spare area address indicating the result of the replacement process is standardized in ECMA-272 so as to be recorded in the DMA as a defect list (DL).

  BD-R, which is a next-generation optical disk that realizes a large capacity using a blue laser that has recently appeared, has a write-once characteristic like DVD-R, and uses random recording and alternation processing like DVD-RAM. Defect management technology is realized. Therefore, management of recorded / unrecorded areas of the user area on the disc is performed by a space bit map (SBM). Japanese Patent Application Laid-Open No. 2004-228561 describes that “when data to be recorded in an area requested to be overwritten (A-B area) is recorded in another area in the data area, the continuity of the user area is maintained after the replacement recording. In addition, the replacement recording is performed from the area (ab area) immediately before the spare area located on the outer peripheral side, and after the replacement recording, the recordable position at the end of the user area is changed. However, after the alternative recording, the last LSN information is newly given, so that the user, the host, etc. can access the LSN. Since the recording command is issued on the basis of this, the alternative recorded area is removed from the LSN, and the continuity of the user area is maintained as a whole, so that the operation of the recording / reproducing unit when recording in the disc is convenient. There is described about the lead. "Technology.

Japanese Patent Application No. 2005-502378 (0027) "Standard ECMA-272: 120mm DVD Rewritable Disc (DVD-RAM)" ECMA 1999 (pp. 43-55)

  The replacement destination assignment method at the time of logical overwriting of a write-once optical disk described in Patent Document 1 is an effective technique for logical overwriting processing for a wide range of user areas with continuous addresses. However, data recorded by using this logical overwriting technology is management information of several bytes to several tens of K bytes used by a file system or application. Further, the management information is often recorded collectively on the inner peripheral side of the optical disc from the viewpoint of shortening the setup time during reproduction and reliability in consideration of the influence of fingerprints. It is desirable to assign a replacement destination to the outer peripheral side described in Patent Document 1 in terms of generating seek processing across the inner and outer periphery of the disc when acquiring management information during setup, and ensuring the reliability of recorded data. It is not an arrangement. In addition, the main purpose of write-once optical disc logical overwriting is not to provide the host with a recording environment similar to that of rewritable optical discs such as DVD-RAM, but to minimize the update of management information that occurs when files are added, deleted, or edited. If it is considered that the write-once optical disk can be used efficiently by giving it to the host, and that the host is given a playback environment similar to that of the rewritable optical disk, the host can record information on the recorded and unrecorded areas on the optical disk during recording. Since it is only necessary to perform data recording while sharing with a write-once optical disk recording device, there is no need to deliberately leave the user area used as the replacement destination outside the logical space.

  The object of the present invention is solved by the following (1) and (2).

(1) In a digital data recording method for a write-once optical disc capable of random recording,
When a recording command to an arbitrary address in the user area on the write-once optical disk is received from the host device, and the address position designated for recording is determined to be recorded from the management information for managing the recorded area of the user area, recording is performed. A recording method in which recording is performed by converting a recording destination for an instruction into an unrecorded area adjacent to a recorded area including an address designated for recording.

(2) In a write-once optical disk recording device,
When a recording command to an arbitrary address in the user area on the write-once optical disk is received from the host device, and the address position designated for recording is determined to be recorded from the management information for managing the recorded area of the user area, recording is performed. A recording apparatus that performs recording by converting a recording destination for an instruction into an unrecorded area adjacent to a recorded area including a recording-designated address.

  The technique of the present invention can improve the reliability of recording on an optical disk.

  Hereinafter, embodiments of a recording method according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments.

  First, the format of recording data and the basic structure of the drive used in the description of the present invention will be described with reference to FIGS.

  FIG. 4 shows an example of the configuration of the optical disk drive. As shown in FIG. 4, the optical disc drive includes an optical head 402 equipped with a laser diode and a photodetector, a recording / reproduction signal processing circuit 403 that performs encoding processing for recording and decoding processing for reproduction, A control microcomputer 404 for managing the operation of the circuit, a servo circuit 405, an interface circuit 406 with a host including a RAM for temporarily storing data in the process of encoding or decoding, and a host and a cable. Input / output terminal 407.

  At the time of reproduction, data recorded on the optical disc 401 is read from the optical head 402 and decoded in the recording / reproduction signal processing circuit 403. This decoding processing includes demodulation processing, error correction processing, and descrambling processing. User data obtained after the decoding process is stored in the RAM in the interface circuit 406 and then output to an external personal computer, a host such as an MPEG board, or the like via the input / output terminal 407. The control microcomputer 404 receives a command from the host or the like, accesses the designated target position on the optical disc 401 while performing rotation control of the optical disc 401, focus control and tracking control of the optical head 403 using the servo circuit 405, and drives Perform overall playback control.

  At the time of recording, user data is input from an external host via the input / output terminal 407. The input user data is stored in the RAM in the interface circuit 406, and then subjected to encoding processing such as scramble processing, error correction encoding processing, modulation processing, and the like by the recording / reproducing signal processing circuit 403. Data is written to the optical disc 401 via the head 402. The control microcomputer 404 receives a command from the host or the like, accesses the recording position on the optical disc 401 specified using the servo circuit 405, and performs recording control of the entire drive.

  Details of the encoding process from user data to recording data at the time of recording handled here will be described with reference to FIGS.

  FIG. 2 shows an example of the configuration of the data frame 301. The data frame 301 is a data string in which user data 201 and information data for managing the user data 201 are grouped. The 2048-byte user data 201 input from the host device 9 includes a 4-byte data identification code (ID) 202 for data identification, a 2-byte IDE 203 that is an ID error detection code, and a 6-byte extension. Reserved data 204 is added. In addition, a 4-byte error detection code EDC 205 for detecting an error included in the data is added to the last part of the data string, and a 2064-byte data frame 301 is formed as a result. Each data frame 301 is handled in the form of 172 bytes and 12 rows.

  FIG. 3 shows a configuration method of the ECC block 302. Normally, the ECC block 302 is a data unit for recording / reproducing of the optical disc recording / reproducing apparatus. A data frame 301 of 172 bytes and 12 rows configured as shown in FIG. 2 forms an ECC block 302 in units of 16 data frames after being scrambled. A 16-byte outer code (PO) 303 is attached to each column in the vertical direction to form 208 rows. A 10-byte inner code (PI) 304 is added to the expanded data in each row to obtain 182 bytes of data. The result ECC book 302 is formed from user data 201 of 182 bytes 208 rows and 2048 bytes × 16.

  In the recording / reproducing signal processing circuit 403, after the ECC block is generated, frequency modulation for limiting frequency components included in the data is performed as a final encoding process (not shown).

  In a recording / reproducing apparatus that performs a replacement process, such as a DVD-RAM drive, when data is recorded, the data on the disk is immediately reproduced after the data is recorded, and the reproduced data and user data remaining in the RAM are stored. A comparison or error correction process is performed to detect the number of errors included in the reproduced data, thereby confirming whether the data has been normally recorded on the optical disk. When it is determined that the result is not recorded normally, the data is repeatedly recorded at the same position (address), and the data cannot be normally recorded at this position, that is, it is determined that the position is defective. In this case, replacement processing for recording the user data remaining in the RAM in the interface circuit 406 in the spare area is performed.

  Normally, these replacement processes are performed in ECC blocks which are recording / reproduction units as shown in FIG. In the data format described with reference to FIGS. 2 and 3, since the data identification code (ID) is added in units of data frames, the top of the ECC block is a multiple of 16, and the correspondence with the logical address is in units of data frames. It becomes. However, in order to simplify the explanation, the lower 4 bits of the data identification code (ID) are ignored, one physical address is assigned to the ECC block, and one logical address is associated with this physical address. To do. Therefore, in the following description, it is assumed that the data unit of the recording / reproducing command from the host is also an ECC block unit.

  Next, an example of a logical overwriting method in a write-once optical disc will be described.

  The explanation will be made in stages. First, the relationship between the logical address space used by the host and the physical address on the optical disk will be shown with reference to FIG. 5, and then it will be performed on a DVD-RAM or the like with reference to FIG. 6, FIG. 8, FIG. An outline of an area necessary for defect management and a defect management method will be described, and a recording method and a recording area management method performed using a space bitmap will be described with reference to FIGS. Thereafter, a logical overwriting method in a write-once optical disc will be described with reference to FIG.

  FIG. 5 is a diagram showing the relationship between the physical address of the optical disk divided into areas for each purpose and the logical address included in the recording / playback command from the host. The optical disk is logically divided into a lead-in 501, a data area, and a lead-out 504. In this example, the data area is further logically divided into a user area 502 and a spare area 503 for defect management. The lead-in 501 and the start physical address of the data area are A and B, respectively, and the end physical address of the lead-out 504 is C. The physical address of the optical disk may be A> B> C depending on the standard, but in this description, the description will be made assuming that the relationship of A <B <C is established. In this case, a logical address is assigned only to the user area 502 as an initial state, and the physical address B + n is associated with the logical address n as a standard. However, when B + n is assigned to another address as a replacement target, the physical address of the replacement destination corresponds to the logical address n. Therefore, when the final address of the user area is B + (a-1), a maximum of 0 to a-1 can be used as the logical address space.

  FIG. 6 is a diagram of a disk for schematically explaining defect management by a replacement process (Linear Replacement method) generally performed on a recordable optical disk. A disk management information area 601 (DMA) for recording recording management information in the lead-in 501 is provided, a defect list table 805 (DLT) for managing replacement information, and a space bitmap 903 for managing recorded / unrecorded areas. (SBM) is recorded. The spare area 503 arranged on the outer periphery side of the user area is continuously used in the address ascending order from the address B + a on the user area 502 side to the address B + (a-1) + (n-1) on the lead-out 504 side. Go.

  FIG. 8 is a diagram for explaining the arrangement of the DLT 805 recorded in the DMA 601 in the lead-in 501. The DMA 601 is divided into a space bitmap recording area 801 (SBA) and a defect list table recording area 802 (DLA), and both areas are continuously used in the address ascending direction. Therefore, the latest DLT 805 among the plurality of DLTs 805 recorded in the DLA 802 is always arranged on the outermost periphery in the DLA 802. The DLT 805 includes only DL header information 803, or one or more DLs 804 indicating correspondence between the DL header information 803, the defective address in the user area 502, and the replacement address of the spare area 503 used as the replacement destination. The arrangement of the DL 804 in the DLT 805 is arranged in ascending order based on the defect address for each factor so that high-speed search is possible during reproduction.

  FIG. 10 is a diagram for explaining the configuration of the DL header information 803 forming the DLT 805. The DL header information 803 includes a 2-byte identifier indicating that the user data 201 in the ECC block 301 is the DLT 805, a 2-byte DL update counter indicating how many times the DLT 805 is updated and recorded, and all of the DLT 805 included in the DLT 805. The total list number of 4 bytes indicating the number of DLs, the total number of registered lists of 4 bytes indicating the number of DLs due to the replacement included in the DLT 805, and the address in the spare area 503 that can be used as a replacement destination next time This is composed of a total of 16 bytes of a 4-byte next candidate address.

  Details of the configuration of DL 804 (defect list) used in defect management will be described with reference to FIG. Each DL 804 includes a defective address in the user area 502, a replacement address in the spare area 503 assigned by the replacement process, and status information indicating the relationship between the two addresses. In the figure, the blacked area on the optical disk indicates a recorded area. The next candidate address included in the DLT 805 indicates the address M702 in the spare area 503 to be used next in the replacement process. If it is determined from this state that the address N701 in the user area 502 is defective, the user data designated to be recorded in the address N701 by the host is recorded as a substitute in the address M702 in the spare area. In this case, the DL 804a includes “address N” and “address M” and “alternate” indicating the relationship between the two addresses in order to indicate this information.

  FIG. 9 is a diagram for explaining the arrangement of the SBM 903 recorded in the DMA 601 in the lead-in 501. Of the plurality of SBMs 903 recorded in the SBA 801 in the DMA 601, the latest SBM 903 is always arranged on the outermost periphery in the SBA 801. The SBM 903 includes SM header information 901 including physical address information related to the user area 602 to which the SBM 903 is applied and various information related to the SBM 903, and a plurality of bit information (902a and 902b) corresponding to the address of the user area 602. The bitmaps in the SBM 903 are arranged so that corresponding physical addresses are in ascending order.

  Each SBM 903 recorded in the SBA 801 manages whether a recording area corresponding to each ECC block 302 which is a physical minimum recording unit of a write-once optical disc that cannot be physically overwritten is recorded or unrecorded. By using this information, it is possible to record the data transferred from the host device on the optical disk without performing the unrecorded verification process of the recording area corresponding to the logical address designated for recording at the time of recording. It becomes. In this description, since the minimum unit that can be physically recorded is the ECC block 302, one bit information is associated with one ECC block 302.

  FIG. 11 is a diagram showing a data structure of the SM header information 901. An identifier “SM” for identifying the SBM 903 is arranged in the bytes 0-1 and 0 in the first SBM created at the time of formatting the disk in the byte 2-3, and is incremented by 1 every time the SBM 903 is recorded and updated thereafter. SM update counter, the physical address corresponding to logical address 0 (corresponding to B in FIG. 5) is arranged in bytes 4-7, and the maximum logical address (corresponding to a-1 in FIG. 5) is arranged in bytes 8-11. Is done.

  FIG. 13 is a diagram showing a change in state of bit information of the SBM 903.

  (A) shows the initial state of the bit information string immediately after formatting. Immediately after the formatting, all the user areas 602 on the write-once optical disc are in an unrecorded state, so that all bit information values of the SBM 903 become 0 indicating that the recording area corresponding to each ECC block 302 is unrecorded. In this state, the value of the SM update counter included in the SM header information 901 (A) is 0 as an initial value. (B) shows a bit information string in state 1 during the optical disk recording process. (C) shows a bit information sequence in a state 2 in which user data is newly recorded in the recording area corresponding to the bit information # 10 on the optical disc from the state 1 in (B). The value of bit information # 10 is 0 indicating unrecorded in (B) state 1, but changes to 1 indicating recorded in (C) state 2.

  FIG. 12 is a diagram of a disk for schematically explaining logical overwriting by a replacement process performed on a write-once optical disk, and a diagram showing a DL of the replacement process by logical overwriting. In this figure, the write-once optical disc is divided into a lead-in 501, a lead-out 504 and a data area according to the purpose of use, and the data area is divided into a user area 502 and a spare area 503. A black area in the user area 502 represents a recorded area, a white area indicates an unrecorded area, a hatched area indicates a recording request from a host in a recorded area from the host, and The horizontal line portion indicates a replacement area in the user area where the drive actually records data in response to a recording command in the recorded area.

In FIG. 12, the upper disk diagram shows the disk state before the replacement process for logical overwriting. In this state, when a recording command is received from the host for the area corresponding to nECC blocks from the address L in the recorded area, the drive corresponding to the logical overwriting is one of the unrecorded areas in the user data as shown in the following disk diagram. Here, data recording is performed from the physical address M to M + (n−1). Next, the drive indicates that data to be recorded from physical address L to L + (n−1) on the disk corresponding to the logical address included in the recording command is recorded from physical address M to M + (n−1). Therefore, two DLs (804b and 804c) indicating the head and end of the replacement, status = replacement (start), defective address = logical overwrite start address, DL composed of the replacement address and status = replacement (end), By adding a defect address = a logical overwriting end address and a DL composed of the replacement address to the DLT 805 as a set, a logical overwriting using the conventional defect management mechanism as it is is realized. However, the number of defective addresses and the number of replacement addresses sandwiched between two DLs 804 having status = replacement (start) and status = replacement (end) are the same, and each of them is the same as DL804 having status = replacement shown in FIG. For example, the relationship between the addresses L + 3 and N + 3 can be regarded as the same as the DL 804 in which the address L + 1 is a defective address, the address N + 1 is a replacement address, and the status is replacement.
In other words, logical overwrite can be easily realized by using the same replacement process as defect management in a write-once optical disc. However, even in this case, the spare area 503 is necessary because it is used as a replacement destination in defect management.

  FIGS. 14 and 15 are diagrams showing how to determine the replacement destination in the logical overwrite processing described with reference to FIG. 12 in the recordable / unrecorded area managed write-once optical disk. In this figure, consecutive recorded areas on the SBM 903 are represented by numbers from 1 from the smaller physical address side to the larger physical address. Taking FIG. 14A as an example, bit information 0, 1, 2, 4, 5, 6, 10, 15, 16, a-2 and a-1 are recorded areas in the SBM 903. Of these, each of 0 to 2, 4 to 6, 10, 15 and 16, and a-2 and a-1 in which one or more physical addresses are continuous are regarded as one continuous recorded area, and bits The recorded areas indicated by the information 0 to 2 are numbered 1 and the recorded areas indicated by the bit information a-2 and a-1 are numbered to be 5.

  FIG. 14A is a diagram showing the allocation position of the replacement destination for the recording command from the host to the logical address 1 corresponding to the recorded area B + 1 indicated by the bitmap information 1 in the recording intermediate state 3. This shows that the replacement destination of the logical overwrite process for the recording command shown in the figure is the unrecorded area B + 3 adjacent to the recorded area 1 including the recorded area B + 1. FIG. 14B is a diagram showing an allocation position of a replacement destination for a continuous recording command from the host to the logical address 1 corresponding to the recorded area B + 1 in the recording intermediate state 4 immediately after FIG. is there. The replacement destination of the logical overwriting process for the actual recording command shown in this figure includes the recorded area B + 1 (consisting of the recorded area 1 and the recorded area 2 in FIG. 14A) and the unrecorded area adjacent to the recorded area 1 This indicates that the region is B + 7. FIG. 15A shows allocation of a replacement destination for the recording command from the host to the logical address a-1 corresponding to the recorded area B + (a-1) in the recording intermediate state 5 immediately after FIG. 14B. It is a figure which shows a position. This shows that the replacement destination of the logical overwrite processing for the recording command shown in the figure is the unrecorded area B + (a-4) adjacent to the recorded area 4 including the recorded area B + (a-1). FIG. 15B is a diagram showing the allocation positions of the replacement destinations for the recording commands for 3 ECC blocks from the logical address 1 corresponding to the recorded area B + 1 from the host in the recording intermediate state 6 immediately after FIG. . The replacement destination of the logical overwrite processing for the recording command shown in the figure is that the recording is performed in the unrecorded areas B + 8 and B + 9 adjacent to the recorded area 4 including the recorded areas B + 1 to B + 3, and in these unrecorded areas. It shows that this is an unrecorded area B + 11 adjacent to a new recorded area 1 made up of recorded area 1 and recorded area 2.

  FIG. 16 is a flowchart showing a series of processing for a recording command from the host including the replacement destination determination processing shown in FIGS. When a recording command is received from the host, it is determined using the SBM 903 whether the physical address corresponding to the logical address included in the recording command is recorded or unrecorded, and this recording command is for the unrecorded area. In this case, data recording is performed at the corresponding physical address. When it is determined that it is a recorded area, it becomes a replacement destination in the logical overwriting process, an unrecorded area where data is recorded is determined, the result is reflected in the DLT 805, and the corrected DLT 805 is referred to Data recording is performed at the replacement destination obtained in (1). Note that this recording command is for a plurality of ECC blocks 302 as shown in FIG. 15B, and when recorded areas and unrecorded areas are mixed, the following two cases can be classified.

  (1) The physical address corresponding to the head logical address included in the recording command is a recorded area.

  (2) The physical address corresponding to the head logical address included in the recording command is an unrecorded area.

  In the case of (1), since the replacement destination assigned from the top physical address is an unrecorded ECC block adjacent to the recorded area including the physical address, a recording command is executed in the process of performing replacement destination assignment processing for each 1EC block 302. As a result, it can be considered that all ECC blocks included in the data have to be handled as recorded areas. This state will be described with reference to FIG. 15A. When a recording command of 3 ECC blocks from logical addresses 10 to 12 is received from the host, the replacement destination of the recorded physical address B + 10 corresponding to the logical address 10 is recorded. The physical address B + 11 adjacent to the completed area 2 is obtained. Next, considering the physical address B + 11 corresponding to the logical address 11, since the data of the physical address B + 10 is recorded in the physical address B + 11, the replacement destination of the physical address B + 11 is assigned to B + 12. Similarly, in order to record the data of the physical address B + 11 at the physical address B + 12 corresponding to the logical address 12, the replacement destination of the physical address B + 12 is assigned to B + 13. That is, as a result, in the case of (1), all ECC blocks are logically overwritten. In the case of (2) as well, (1) For the same reason, a continuous unrecorded area from the first ECC block 302 of the recording command to the next recorded area is handled by normal recording processing, and the subsequent items included in the recording command All physical address ranges are handled by logical overwriting.

  FIG. 1 is an example of a flowchart showing details of a recording position determination process in the logical overwriting process included in FIG. Assuming that the maximum physical address in a continuous recorded area including the physical address corresponding to the logical address that must be logically overwritten is M, it is first examined whether M + 1 can be used as the replacement destination. Here, it is checked whether or not the address M matches the maximum physical address B + a−1 in the user area 502, and if it does not match, the physical address M + 1 is used as a replacement destination in this logical overwriting process. If they match, the physical address M + 1 is outside the user area, so the minimum physical address in the recorded area is set to L−1 adjacent to L as a replacement destination. However, when the logical overwrite processing range extends over a plurality of ECC blocks, the allocation of the replacement destination to L-1 adjacent to the minimum physical address L has the largest physical address in the logical overwrite processing range in consideration of recording / reproduction performance. This algorithm is applied from the one with the larger physical address of the ECC block to be logically overwritten so as to be an ECC block. In addition, when the logical overwrite processing range of a plurality of ECC blocks is recorded from the adjacent address M + 1 of the maximum address M in the recording area, when the maximum physical address B + a-1 in the user area 502 is reached in the middle of the recording range, The logical overwriting range remaining after the allocation of the logical overwriting range from the recording area M + 1 to B + a-1 is assigned from L-1 adjacent to the minimum physical address L for recording processing, or the unrecorded area M + 1 to B + a- This is achieved by allocating the entire logical overwrite processing range without using 1 from L-1 adjacent to the minimum physical address L adjacent to the minimum physical address L and performing recording processing.

  FIG. 17 is an example of a flowchart showing details of the recording position determination process in the logical overwriting process included in FIG. Let M be the maximum physical address in the continuous recorded area including the physical address corresponding to the logical address that must be logically overwritten, and let L be the minimum physical address in this recorded area. Each distance from the physical address O requested to be recorded (the start address of the recording request or the intermediate address between the recording request start address and the recording request end address) (the address difference is used in this flowchart). Depending on the size, the radial distance of the optical disc may be used.) When it is determined that the distance from O to M is shorter or the same as the distance from O to L, it is first examined whether or not M + 1 can be used as a replacement destination. Here, it is checked whether or not the address M matches the maximum physical address B + a−1 in the user area 502, and if it does not match, the physical address M + 1 is used as a replacement destination in this logical overwriting process. If they match, the physical address M + 1 is outside the user area, so the minimum physical address in the recorded area is set to L−1 adjacent to L as a replacement destination. Similarly, when it is determined that the distance from O to L is shorter than the distance from O to M, it is first examined whether L-1 can be used as a replacement destination. Here, it is checked whether or not the address L matches the minimum physical address B in the user area 502. If the address L does not match, the physical address L-1 is used as a replacement destination in the logical overwriting process. If they match, the physical address L-1 is outside the user area, so the replacement destination is M + 1. However, when the logical overwrite processing range extends over a plurality of ECC blocks, the allocation of the replacement destination to L-1 adjacent to the minimum physical address L has the largest physical address in the logical overwrite processing range in consideration of recording / reproduction performance. This algorithm is applied from the one with the larger physical address of the ECC block to be logically overwritten so as to be an ECC block. Further, when the logical overwrite processing range is composed of a plurality of ECC blocks, it can be handled in the same manner as described with reference to FIG.

  FIG. 18 is an example of a flowchart showing details of the recording position determination process in the logical overwriting process included in FIG. Let M be the maximum physical address in the continuous recorded area including the physical address corresponding to the logical address that must be logically overwritten, and let L be the minimum physical address in this recorded area. The recording-requested physical address O is the start address of the recording request or an intermediate address between the recording request start address and the recording request end address, and P is the number of ECC blocks or the address range for which recording is requested. If the next successive logical overwrite processing range is a certain range, the recording request range is equal to a predetermined reference value R at the time of execution of the recording processing from the viewpoint that the access time in normal reproduction processing will be acceptable or When the reference value R is exceeded, it is examined whether M + 1 can be used unconditionally as a replacement destination in order to simplify the processing. Here, it is checked whether or not the address M matches the maximum physical address B + a−1 in the user area 502, and if it does not match, the physical address M + 1 is used as a replacement destination in this logical overwriting process. If they match, the physical address M + 1 is outside the user area, so the minimum physical address in the recorded area is set to L−1 adjacent to L as a replacement destination. However, when the logical overwrite processing range extends over a plurality of ECC blocks, the allocation of the replacement destination to L-1 adjacent to the minimum physical address L has the largest physical address in the logical overwrite processing range in consideration of recording / reproduction performance. This algorithm is applied from the one with the larger physical address of the ECC block to be logically overwritten so as to be an ECC block. Further, when the logical overwrite processing range is composed of a plurality of ECC blocks, it can be handled in the same manner as described with reference to FIG. On the other hand, if the recording request range does not exceed the predetermined reference value R, each distance from the physical address O requested to be recorded (the address difference is used in this flowchart, but depending on the size of the recorded area, the optical disk Can be used). When it is determined that the distance from O to M is shorter or the same as the distance from O to L, it is first examined whether or not M + 1 can be used as a replacement destination. Here, it is checked whether or not the address M matches the maximum physical address B + a−1 in the user area 502, and if it does not match, the physical address M + 1 is used as a replacement destination in this logical overwriting process. If they match, the physical address M + 1 is outside the user area, so the minimum physical address in the recorded area is set to L−1 adjacent to L as a replacement destination. Similarly, when it is determined that the distance from O to L is shorter than the distance from O to M, it is first examined whether L-1 can be used as a replacement destination. Here, it is checked whether or not the address L matches the minimum physical address B in the user area 502. If the address L does not match, the physical address L-1 is used as a replacement destination in the logical overwriting process. If they match, the physical address L-1 is outside the user area, so the replacement destination is M + 1.

  The algorithm shown in this flowchart can be easily realized by the optical disk recording apparatus shown in FIG. If the control microcomputer 404 determines that the recording command from the host is a recording command corresponding to the start of a series of recording processes, the user data transferred from the host is temporarily stored in the RAM in the interface 406 and then from the host. The transferred user data has reached a certain amount, a certain time has passed, and the control microcomputer 404 performs LSN → PSN conversion according to the above flow chart in accordance with the cache forced data recording command from the host. The data is actually recorded while determining the recording position on the optical disc 401 while registering the DL 804 reflecting the LSN → PSN conversion result in the DLT 805.

  Since the replacement destination allocation rule shown in the present invention is applied to the logical overwrite processing of the write once optical disc, the replacement destination can be arranged in the vicinity of the replacement source. It is possible to reduce the time required for positioning to the target address (seek processing).

  As a result, data recording to the optical disc and data reproduction from the optical disc can be performed at high speed, and a file system driver or application that substantially records data on the optical disc intentionally stores file and directory management information on the inner circumference of the disc. By duplicating and recording on the outer periphery, it becomes possible to protect management information from fingerprints and scratches that are likely to cause optical disk playback errors, and it is possible to provide a higher performance and safer optical disk recording and playback environment It becomes.

  The embodiments of the recording method and the optical disc recording apparatus according to the present invention have been described in detail above. However, the present invention is not limited to these embodiments, and various improvements and modifications can be made without departing from the gist of the present invention. Changes can be made.

  Further, according to the present invention, it is possible to optimally arrange the replacement destination in the logical overwriting process from the viewpoint of reliability, recording, and reproduction speed processing.

It is a flowchart which shows the replacement destination determination method at the time of logic overwriting. It is explanatory drawing which showed the structure of the data frame. It is explanatory drawing which showed the structure of the ECC block. It is explanatory drawing which showed the structure of the optical disk drive. It is explanatory drawing which showed the response | compatibility of a logical address space and the physical address of an optical disk. It is explanatory drawing which showed the recording type optical disk which has a defect management function. It is explanatory drawing which showed the replacement process and DL of a recordable optical disk. It is explanatory drawing which showed the DLT management method of write-once type | mold optical disk. It is explanatory drawing which showed the recording area management method of write-once type | mold optical disk. It is explanatory drawing which showed the structure of DL header information. It is explanatory drawing which showed the structure of SM header information. It is explanatory drawing which showed the logical overwrite process of the write-once type | mold optical disk. It is explanatory drawing which showed the recording area management method in SBM. It is explanatory drawing which showed the replacement destination allocation process at the time of logic overwriting. It is explanatory drawing which showed the replacement destination allocation process at the time of logic overwriting. It is a flowchart which shows the replacement destination allocation processing method at the time of logic overwriting. It is a flowchart which shows the replacement destination allocation processing method at the time of logic overwriting. It is a flowchart which shows the replacement destination allocation processing method at the time of logic overwriting.

Explanation of symbols

401 optical disc, 402 optical head, 403 recording / reproduction signal processing circuit, 404 control microcomputer, 405 servo circuit, 406 interface circuit, 407 input / output terminal

Claims (6)

In a digital data recording method for a write-once optical disc capable of random recording,
A recording command to an arbitrary address in the user area on the write-once optical disk from a host device is received, and the address position designated for recording is determined to be recorded from management information for managing a recorded area of the user area. In this case, the recording destination for the recording command is converted into an unrecorded area adjacent to the recorded area including the recording designated address, and recording is performed .
An unrecorded area adjacent to the recorded area has an address larger than the address designated for recording;
When there is no unrecorded area having an address larger than the recording designated address, the unrecorded area adjacent to the recorded area is an unrecorded area having an address smaller than the recording designated address. A recording method characterized by the above. In a digital data recording method for a write-once optical disc capable of random recording,
A recording command to an arbitrary address in the user area on the write-once optical disk from a host device is received, and the address position designated for recording is determined to be recorded from management information for managing a recorded area of the user area. In this case, the recording destination for the recording command is converted into an unrecorded area adjacent to the recorded area including the recording designated address, and recording is performed.
An unrecorded area adjacent to the recorded area is an unrecorded area having an address in which the difference from the designated recording address is the smallest in the unrecorded area . In a digital data recording method for a write-once optical disc capable of random recording,
A recording command to an arbitrary address in the user area on the write-once optical disk from a host device is received, and the address position designated for recording is determined to be recorded from management information for managing a recorded area of the user area. In this case, the recording destination for the recording command is converted into an unrecorded area adjacent to the recorded area including the recording designated address, and recording is performed.
The unrecorded area adjacent to the recorded area is larger than the record-designated address when the addresses designated for recording from the host device are continuous and the number of consecutive addresses exceeds a predetermined number. and unrecorded areas that have a address, if the address number of the continuous does not exceed the predetermined number, characterized in that the non-recorded area having an address difference between the recorded designated address is minimized Recording method. In a write-once optical disk recording device,
A recording command to an arbitrary address in the user area on the write-once optical disk from a host device is received, and the address position designated for recording is determined to be recorded from management information for managing a recorded area of the user area. In this case, the recording destination for the recording command is converted into an unrecorded area adjacent to the recorded area including the recording designated address, and recording is performed.
The unrecorded area adjacent to the recorded area has an address larger than the address designated for recording,
When there is no unrecorded area having an address larger than the recording designated address, the unrecorded area adjacent to the recorded area is an unrecorded area having an address smaller than the recording designated address. A recording apparatus. In a write-once optical disk recording device,
A recording command to an arbitrary address in the user area on the write-once optical disk from a host device is received, and the address position designated for recording is determined to be recorded from management information for managing a recorded area of the user area. In this case, the recording destination for the recording command is converted into an unrecorded area adjacent to the recorded area including the recording designated address, and recording is performed.
An unrecorded area adjacent to the recorded area is an unrecorded area having an address in which the difference from the designated recording address is the smallest in the unrecorded area . In a write-once optical disk recording device,
A recording command to an arbitrary address in the user area on the write-once optical disk from a host device is received, and the address position designated for recording is determined to be recorded from management information for managing a recorded area of the user area. In this case, the recording destination for the recording command is converted into an unrecorded area adjacent to the recorded area including the recording designated address, and recording is performed.
The unrecorded area adjacent to the recorded area is larger than the record-designated address when the addresses designated for recording from the host device are continuous and the number of consecutive addresses exceeds a predetermined number. An unrecorded area having an address, and when the number of consecutive addresses does not exceed a predetermined number, an unrecorded area having an address that minimizes a difference from the address designated for recording is provided. Recording device.

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