JP2010218590A - Recording medium, recording method, recording device, reproducing method, and reproducing device of information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance data reliability while maintaining high compatibility to a conventional format before a density is increased, when the density is increased, during recording to an optical disk. <P>SOLUTION: A parity having the same structure as that of a normal data cluster is added, and the added position is indicated by a form similar to that of defect management. Thus, data reliability is improved while high compatibility to a conventional device is maintained. A parity is obtained by assuming a virtual cluster for data of a cluster unit insufficient to add a parity. Thus, a freedom of a unit for recording is not reduced. During recording, a parity is added by data reproduced from a disk and input data, and a cluster including a newly generated parity is indicated to have exchangeable relationship with a cluster including a parity before the recording. Thus, the cluster is achieved even on a write-once medium. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an information recording medium, an information recording apparatus and an information recording method for recording information on the information recording medium, and an information reproducing apparatus and an information reproducing method for reproducing information from the information recording medium.

  As background art of the present invention, for example, there are Patent Document 1 and Non-Patent Document 1. Patent Document 1 describes “Burst Indicator Subcode”. Non-Patent Document 1 describes a Blu-ray disc.

JP 2001-515641 A

Blu-ray Disc Reader Ohm (versions 166-169)

  In a Blu-ray disc that is an optical disc developed from the conventional DVD, high reliability of data is improved by using Burst Indicator Subcode, which is a technique described in Patent Document 1. Further, with respect to defects and the like, high reliability has been ensured by using replacement processing using a defect list as described in 166P-169P of Non-Patent Document 1. However, if the recording density is increased in order to further increase the capacity, the C / N ratio of the reproduction signal is deteriorated, so that the conventional reliability is insufficient. In order to realize a higher-density disc at a lower price, it is necessary to improve the correction capability while maintaining high compatibility with the current Blu-ray disc.

  The above-mentioned problem is solved by the invention described in the claims as an example.

  According to the present invention, it is possible to improve data reliability while maintaining high compatibility with conventional devices.

Data arrangement diagram as an embodiment of an optical disk recording method Data layout according to conventional optical disk recording method Data layout according to conventional optical disk recording method Data arrangement diagram as an embodiment of an optical disk recording method Data arrangement diagram as an embodiment of an optical disk recording method Format diagram for instructing data arrangement, which is an embodiment of an optical disk recording method Flowchart showing an embodiment of an optical disk recording method Data layout according to conventional optical disk recording method Flowchart showing an embodiment of an optical disk recording method Flowchart showing an embodiment of an optical disk recording method Block diagram showing an embodiment of an optical disk recording / reproducing apparatus Flowchart showing an embodiment of an optical disk reproducing method Illustration of another embodiment Flowchart of another embodiment

  The first embodiment of the present invention will be described below.

  FIG. 1 shows a data configuration method when a recording method according to the present invention is applied, taking the Blu-Ray Disc format as an example. Data has a structure in which Data Cluster and ECC Cluster are arranged in order, and both Data Cluster and ECC Cluster include RUN IN, Physical Cluster (Data and ECC), and RUN OUT. Both Physical Cluster (Data and ECC) have a structure to which an error correction code is added as shown in FIGS.

  First, the configuration in the physical cluster will be described with reference to FIGS. The input user data is divided into 2048 byte sectors, 4 byte error detection codes are added, 32 sectors are collected, arranged in a 216 row x 304 column matrix, and every 216 bytes. Parity generated by a 32-byte Reed-Solomon code is added to the configuration shown in FIG. 3 of 248 rows × 304 columns. Next, data is taken from adjacent columns and arranged alternately by 1 byte to form an array of 496 rows × 152 columns, and as shown in FIG. 2, an ECC column of 496 rows × 38 columns × 4 is obtained. A Burst Indicator Subcode (BIS column) is added, which has stronger correction capability than the ECC column and records address information. The ECC column is capable of erasure correction of up to 32 bytes depending on the position indicated by BIS, and syndrome correction of up to 16 bytes is also possible, achieving higher reliability than DVD (Fig. 2). A plurality of physical clusters (17 clusters in the figure) having such a structure are collected, and a physical cluster having only a parity is added to form a cluster layered ECC block. The processing procedure for creating the data structure will be described below. 1) The input data is divided into 2048 bytes, and an error detection code is added to form a sector. 2) Collect data for 17 clusters with 32 sectors as a cluster. 3) Parity is generated for 17 clusters of data. If a fraction occurs, the fraction is padded with zeros to make a cluster dedicated to parity. A cluster layered ECC block is composed of 17 clusters of data and 1 cluster of parity. 4) A physical cluster is configured by adding a parity, adding a BIS, and a synchronization code to each cluster. 5) Record sequentially from the left cluster in FIG. The physical cluster is recorded in order from the row in FIG. Each row is recorded from left to right.

  As described above, according to the present embodiment, parity can be added while maintaining the cluster format in the optical disc recording / reproducing apparatus in which the reliability is ensured by adding parity in units of clusters. In addition to improving the reliability of a device that performs recording and playback according to a format that secures reliability by adding parity in cluster units, the reliability can be improved by adding parity in conventional cluster units. Even with an apparatus that performs recording and reproduction according to the reserved format, there is an effect that reproduction is possible when the reproduction condition of the disc is good. In the present embodiment, an example in which there are 17 Data Clusters and 1 ECC Cluster has been described. However, if Data ECC is completed in units of Clusters, the same effect can be obtained without depending on this numerical relationship. Also, since the ECC Cluster corresponding to the Data Cluster is placed immediately after the ECC in the Clustr, it cannot be corrected, and when using the Cluster Layered ECC between Clusters, access to other positions does not occur, so the playback speed is increased. Playback can be performed without reduction.

  Next, an example of a specific arrangement of Cluster Layered ECC will be described with reference to FIGS. In this example, 1 Cluster of Data Cluster is divided into 384 blocks by 171 bytes. Since 171 bytes are taken sequentially in the column direction, they will be arranged vertically with the ECC in the cluster. Even if there is a series that cannot be corrected by the ECC in the cluster, there is an error in the cluster layered ECC series. Is distributed. As shown in FIGS. 4 and 5, Data Cluster0 to Data Cluster16 have the same structure. The data of these 17 clusters is divided into 17 × 384 sequences of (0,0) to (16,383), but a parity of 10 bytes is added to each of them as shown in ECC Cluster of FIG. The Parity is arranged in column order in the order of (0,0) to (0,383) to (16,383). The fractional 384 bytes are padded with zeros, but may be reserved data areas. As described above, in this embodiment, an example of a method for effectively arranging Cluster Layered ECC perpendicular to the ECC sequence in the Cluster has been shown. In this embodiment, the parity is applied to all the 216 × 304 data in the column order. However, in order to improve the compatibility of the Cluster format, the location of the error detection code added to each sector may be skipped and assigned. In addition, in order to prepare for the process of adding a parity in a sector unit state, it is possible to select one byte at a time from the head of each sector in order and assign to (0,0) to (0,383) to (16,383) in order. good.

  Next, a second embodiment of the present invention will be described with reference to FIG. The upper part of FIG. 6 shows the data arrangement of the disk, with the left side being the inner circumference side and the right side being the outer circumference side. Management areas (DiscManagementArea) DMA1, DMA2, DMA3, and DMA4 for managing UserData are arranged on the inner and outer circumferential sides with UserDataArea for recording user data. The DMA includes a DefectList that instructs replacement of defective sectors. In the DefectList, an entry is added for each defect. Each entry is indicated by Status 1 and 2 indicating the type of list, an Address DefectAddress indicating a defective sector, and an Address ReplacementAddress indicating a sector where replacement data is recorded. And In the system showing the replacement process in this way, as a method of designating the position where the ECC Cluster of FIG. 1 is inserted, Status1 and 2 are set to unique values different from the status indicating the normal replacement process as shown in DFLentry1. The location of the DataCluster and ECC Cluster in FIG. 1 can be clarified by assigning one DFLentry to one ECC Cluster with the address of the ECC Cluster as ParityAddress. In FIG. 1, ECCCluster is arranged in the user data area so as to be continuous with related data. However, if it is designated as the replacement area, the compatibility with the conventional apparatus becomes higher. It can also be specified as shown in DFLentry2,3. DFLentry 2 and 3 indicate where the user data has been shifted and recorded by the insertion of the ECC Cluster when only the user data is recorded. In FIG. 1, the data cluster 17 to the data cluster 33 indicate how the recording position is shifted due to the insertion of ECC Cluster 0. OriginalAddressFirst is the address of DataCluster17 before ECC Cluster 0 is inserted, OriginalAddressLast is the address of DataCluster33 before ECC Cluster 0 is inserted, ShiftAddressFirst is the address of DataCluster17 after insertion of ECC Cluster 0, ShiftAddressLast is the address of DataCluster 33 after ECC Cluster 0 is inserted. Such a format can also clarify the positions of DataCluster and ECC Cluster in FIG. It can also be specified as shown in DFLentry 4 and 5. DFLentry 4 and 5 indicate the addresses of the beginning and end of the Cluster group having the configuration of ClusterLayeredECC. When only the area shown in FIG. 1 has a ClusterLayeredECC configuration, LayeredECCAddressFirst indicates the address of DataCluster0, and LayeredECCAddressLast indicates the address of ECC Cluster1. If expressed in such a format, it is only necessary to indicate the head and tail addresses of the Cluster group having the ClusterLayeredECC configuration, so that the amount of DFLentry can be saved. As described above, according to the present embodiment, it is possible to clarify the position of the ECC Cluster added to the whole or a part of the disk while maintaining high compatibility with the defect management system of BluRayDisc. Since this DMA area itself is a place where important information is recorded, the configuration of the ClusterLayeredECC may be taken without depending on this designation method.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a flowchart showing an optical disk recording method according to the present invention. The input data is collected as a cluster every time 65664 bytes = 64 Kbytes are input (701), and when the number of clusters constituting the ClusterLayeredEC is reached (702-yes), parity stored in the ECC cluster (for example, ECC Cluster0 in FIG. 4). ) Is calculated (703). Next, a parity is added to each cluster data including the generated ECC cluster, an address is added (704), and the data is sequentially modulated (705) and recorded on the disk (706). When the above processing is repeated and recording is completed (707), the position of the ECC Cluster is registered on the disc in the format shown in FIG. As described above, according to this embodiment, ClusterLayeredECC can be additionally added to the entire disk or a part of data, and the location of the ECC Cluster can be registered in the management area of the disk. In addition to maintaining high compatibility with BluRay discs, it is also possible to add ECC Cluster only to some data with poor data recording status.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 8, “a” shows the arrangement of data and the contents of the defect list to be registered when data for 17 clusters having the number of clusters constituting the ClusterLayeredECC in exactly Data Cluster 0 to Data Cluster 16 is written to the disk. b shows the arrangement of data and the contents of the defect list to be registered in the case where a fraction is obtained with respect to 17 cluster units constituting the ClusterLayeredECC from Data Cluster 0 to Data Cluster 18. c is the recording of the defect list to be registered in the case where the fraction is no longer in the cluster number 17 cluster unit constituting the ClusterLayeredECC from Data Cluster 0 to Data Cluster 33 after performing the recording shown in b once. The contents are shown. In the case of a, when data from Data Cluster0 to Data Cluster16 is input, ECC Cluster0 data is obtained from these data and recorded in order. ECC Cluster 0 address 17 is registered in entry 0 of DFL (= DefectList). In the case of b, first, when data from Data Cluster0 to Data Cluster16 is input, data from ECC Cluster0 is obtained from these data and recorded in order. ECC Cluster 0 address 17 is registered in entry 0 of DFL (= DefectList). Next, it is assumed that Data Clusters 17 and 18 are input and the recording is received up to this point. In this case, data in ECC Cluster 1 is obtained by virtually setting Data Clusters 19 to 33 as all 0, and are recorded in the order of Data Clusters 17 and 18 and ECC Cluster 1. The ECC Cluster 0 address 17 is registered in the entry 0 of the DFL (= DefectList), and the ECC Cluster 1 address 20 is registered in the entry 1. In the case of c, the processing from once recording Data Cluster 0 to ECC Cluster 1 is the same as in the case of b. In addition, when adding Data Clusters 19 to 33, Data Clusters 17 and 18 are read from the disk, and ECC Cluster 1 is calculated again from the combined data of Data Clusters 19 to 33. Thus, Cluster 19 to 33 and ECC Cluster 1 are recorded from address 21. Then, the address 20 of ECC Cluster 1 to be invalidated and the address 36 of ECC Cluster 1 to be valid for replacement are registered in entry3. As described above, according to this embodiment, even if the number of Clusters constituting the ClusterLayeredECC is increased, the ECC Cluster can be virtually calculated even in a unit shorter than the ClusterLayeredECC configuration length, so that recording can be terminated and ECC can be terminated. By replacing the cluster, it is also possible to perform additional writing after the recording is completed due to a fraction of a unit shorter than the configuration length. Furthermore, it is possible to have high compatibility from the similarity with the defect management of the conventional disk.

  Here, as an example of c, an example in which Data Clusters 19 to 33 are additionally recorded following the case of b has been shown. However, recording of less than 17 cluster units may be instructed following the case of b. For example, it is a case where Data Cluster 19 to 21 are added after b. In this case, ClusterLayeredECC may start with Cluster17, read Data Clusters 17 and 18 from the disk, and calculate ECC Cluster1 again from the combined data of Data Clusters 19 to 21 (in this case Data Cluster21 ~ 33 is virtually all 0 and ECC Cluster is created), ClusterClusteredECC with Cluster17 as the head is followed by ClusterLayeredECC with Cluster19 as the head, and Data Cluster22-35 is virtually all 0 ECC Cluster may be generated. In the former case, since the number of valid ECC Clusters can be suppressed to a small value, an effect that processing at the time of reproduction is fast is produced. In the latter case, in order to record data of Clusters 19 to 21, Data Cluster 17, Since there is no need to read 18, the effect of quick recording occurs.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a flowchart showing an optical disk recording method according to the present invention. The input data is collected as a cluster every time 65664 bytes = 64 Kbytes are input (701), and when the number of clusters constituting the ClusterLayeredEC is reached (702-yes), parity stored in the ECC cluster (for example, ECC Cluster0 in FIG. 4). ) Is calculated (703). If the number of Clusters constituting the ClusterLayeredECC has not been reached and recording is to be terminated (901-yes), the remaining amount not reaching the Cluster number is virtually set to 0 and the parity stored in the ECC Cluster is calculated (902). Next, parity is added to each cluster data including the generated ECC cluster in units of clusters (704), sequentially modulated (705), and recorded on a disk (706). When the recording is completed (707), the position of the ECC Cluster is registered on the disk in the format shown in FIG. As described above, according to the present embodiment, ClusterLayeredECC can be additionally added to the entire disk or a part of data, and further, recording in which a fraction less than the number of Clusters constituting the ClusterLayeredECC is generated is also possible. In addition, the location of the ECC Cluster can be registered in the management area of the disc, so it can maintain high compatibility with conventional BluRay discs for recording with various numbers of clusters, and some data recording conditions are poor. It is also possible to add ECC Cluster only to the data.
Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a flow chart showing an optical disk recording method according to the present invention and a method for performing additional writing after recording is completed at a point where a fraction less than the number of Clusters constituting the ClusterLayeredECC is generated according to the fifth embodiment. . First, the DMA is read to confirm the position of the ECC cluster, and the ECC cluster corresponding to the fractional data generated during recording is read to perform error correction processing in units of clusters (1000). Next, based on the information on the position of the ECC Cluster recorded in the DMA, a fraction of the number of Clusters constituting the ClusterLayeredECC generated at the end of recording is derived, and the cluster for the fractional number is assumed to be 0, and the ClusterLayeredECC Error correction processing is performed according to (1001). The next input data is collected as a cluster every time 65664 bytes = 64 Kbytes are input (701), and is combined with the fractional data read and corrected (1002). The processing of 702, 703, 901, 902, 704, 705, and 706 after joining is the same operation as that of the fifth embodiment shown in FIG. Next, the correspondence between the position of the ECC cluster originally written and the data of the position of the ECC cluster regenerated after connecting the data is registered in the DMA as replacement information. The subsequent processing may be the same as the processing shown in FIG. In the above description, the ECC cluster replacement is registered in the DMA when the recording of the first cluster of the additional recording is completed, but there is no problem even if it is performed collectively at the end of the recording. As described above, in the present embodiment, additional recording can be performed after a fraction of a unit shorter than the ClusterLayeredECC configuration length occurs and recording is completed.
Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 shows an optical disk recording / reproducing apparatus according to the present invention. In FIG. 11, 1101 is an optical disk recording medium, 1102 is a disk motor that rotates the optical disk recording medium 1101, 1103 is an optical pickup that emits recording light to the optical disk recording medium and detects a reproduction signal, Reference numeral 1104 denotes an analog front end AFE that performs equivalent processing of the reproduction signal detected by the optical pickup 1103. Reference numeral 1105 denotes a demodulation circuit that performs demodulation processing after the signal transmitted by the AFE 1104 is binarized by a binarization processing circuit (not shown). Data demodulated by the demodulation circuit 1105 and detected in units of clusters is primarily stored in the DRAM 1107 via the memory controller 1 (1106). Reference numeral 1109 denotes an error correction circuit, and the demodulated data stored in the DRAM 1 performs an error correction operation on the parity that is closed in the cluster with respect to the data read through the memory controller 1 (1106). The error correction circuit 1109 also performs a parity generation operation for closing within the cluster during recording. Reference numeral 1111 denotes an error correction circuit that reads data stored in the DRAM 1107 after being subjected to intra-cluster error correction processing by the error correction circuit 1109 via the memory controller 1112 and performs error correction processing between clusters. At the time of recording, before the generation of the error correction code in the cluster, the error correction code between the clusters is generated for the input data to generate ECC Cluster data. In generating an error correction code between clusters, when the number of clusters is insufficient, ECC Cluster data may be generated using virtual fixed data. In the case of appending to the data thus generated and recorded, the operation according to the sixth embodiment is performed. Reference numeral 1113 denotes a DMA control circuit. During reproduction, defect cluster replacement processing is performed according to the defect list read from the DMA area of the disk, ECC Cluster position is derived, and error correction calculation according to ClusterLayeredECC is performed according to the position information. The memory controller 2 is controlled to execute the above. During recording, data to be recorded in the DMA is also generated from the ECC Cluster position. Reference numeral 1108 denotes a modulation circuit, which reads data after an error correction code in the cluster is added by 1109 during recording from the DRAM 1107 via the memory controller 1 (1106), performs modulation processing, and sends a signal to the pickup 1108. A servo circuit 1114 controls the pick 1103 and the disk motor 1102. Reference numeral 1110 denotes an interface circuit that outputs corrected data between clusters during reproduction, and inputs data during recording. Reproduction data reading 1115 is a CPU, which controls each of the above elements by a program to perform recording and reproduction. Therefore, at the time of reproduction, the data corrected by the error correction circuit in 1109 cluster is determined based on the defect list reproduced from the DMA, and the ECC cluster of ClusterLayeredECC is determined according to the 1113 DMA control circuit. Correction processing is further performed. During recording, the error correction code generation operation is performed by the error correction circuit between 1111 clusters to generate ECC Cluster data, and then the error correction code completed within the cluster is added by the error correction circuit within 1109 cluster. Record after completing each cluster. As described above, the present embodiment realizes an apparatus that enables recording and reproduction in accordance with the recording method shown in the first embodiment.

  Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 shows another example of where the ECC cluster is arranged in the present invention. In this embodiment, the ECC cluster is arranged in the SpareArea where the replacement sector of the defective sector is placed. In this arrangement, if the ECC cluster is shown according to the format shown in DFLentry 1 in FIG. 6, compatibility with defect processing can be further enhanced.

  Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 13 is a flowchart showing an optical disk recording method according to the present invention. The input data is collected as a cluster every time 65664 bytes = 64 Kbytes are input (701), and when the number of clusters constituting the ClusterLayeredEC is reached (702-yes), parity stored in the ECC cluster (for example, ECC Cluster0 in FIG. 4). ) Is calculated (703). Next, parity is added to each cluster data including the generated ECC cluster in units of clusters (704), sequentially modulated (705), and recorded on a disk (706). The data is reproduced (1300), and the recording quality is evaluated by checking the number of errors detected by the error correction circuit (1301). For integers m and n where m> n, the number of errors ≦ n. When the recording quality is good, the processing is repeated until the recording end (707) without performing any special processing. If the quality is high enough to maintain playback compatibility if the correction capability is strengthened, the parity stored in the ECC Cluster is calculated and additional ECC Cluster is generated. And recording (1302), and the process is repeated until the recording is completed (707). If it is determined that the number of errors> m> n and the recording quality is poor, a replacement process is performed on the cluster determined to have a poor quality (1303), and the process is repeated until the end of recording (707). When the recording is to be ended (707-yes), the cluster for the replacement process and the ECC cluster to be added are registered in the disk (1304). As described above, according to the present embodiment, it is necessary to add ECC Cluster after the recording quality is evaluated by Read After Write. Therefore, it is possible to improve the correction capability only in a poor quality place. It can be used efficiently. Furthermore, if sufficient quality cannot be obtained even with the addition of ECC Cluster, it is possible to cope with discs with widely varying recording quality because the processing is switched to replacement processing.

  Next, a ninth embodiment of the present invention will be described with reference to FIG. FIG. 14 is a flowchart showing an optical disk reproducing method according to the present invention. At the time of disk reproduction, first, DMA (DiscManagiment Area) data on the disk is reproduced (1401), and ECC Cluster position information is acquired to clarify the configuration of ClusterLayeredECC (1402). Thereafter, the desired user data is accessed, the data is detected by the pickup, the demodulation process is performed, and then the error correction process is performed according to the error correction code that is closed in the cluster (1403). On the other hand, whether the configuration of ClusterLayeredECC is taken is determined according to the processing result of 1402 (1404). If the configuration of ClusterLayeredECC is taken (1404-yes), the parity of ECC Cluster is used according to the ClusterLayeredECC configuration, Correction processing is performed across clusters. If the ClusterLayeredECC configuration is not employed (1404-no), the processing 1405 is not performed. The above processing is repeated until the reproduction is completed (1406). As described above, according to the present embodiment, it is possible to increase the reliability of reproduction by performing error correction processing using an ECC cluster added entirely or locally according to DMA information. In addition, in principle, ECC cluster is added in the information obtained from DMA, and it is reproduced without correction processing across clusters using ECC Cluster parity. When error correction is impossible, correction processing across clusters using ECC Cluster parity may be performed. In this way, higher speed processing is possible. Also, in principle, correction processing across clusters using ECC Cluster parity can be performed, so even with the conventional model, the reliability is reduced, but reproduction is possible.

  According to this embodiment, a parity having the same structure as that of a normal data cluster can be additionally added, and the added position is indicated in the same format as the defect management, so that high compatibility with a conventional apparatus is maintained. The reliability of data can be improved. In addition, since the parity is obtained assuming a virtual cluster even for data in units of clusters that do not satisfy the parity, the degree of freedom of the unit for recording is not reduced. In addition, when adding data, parity can be added between the data reproduced from the disk and the input data, and the cluster in which the newly generated parity is mounted indicates the replacement relationship with the cluster in which the parity before adding is mounted. Therefore, it is realizable also with a write-once medium.

701: Data input processing, 703: Cluster layered ECC correction processing, 704: Cluster unit ECC correction processing, 708... ECC cluster registration processing

Claims (13)

A recording method for recording digital information on a recording medium,
A data block is generated for the input data in a predetermined unit,
Generating an error correction code for a predetermined number of data blocks of the data block, generating a correction data block of the same format as the data block;
A correction code is added to each of the correction data block and the data block to generate a data cluster,
A digital information recording method, wherein the data cluster is modulated and recorded on a recording medium. The recording method according to claim 1,
A digital information recording method, wherein address information of the correction data block is recorded in a specific area of a recording medium.   3. The recording method according to claim 2, wherein a recording format of the address information of the correction data block with respect to a specific area of the recording medium is the same format as a recording format of address information indicating replacement processing of a defective data cluster. To record digital information.   3. The recording method according to claim 2, wherein the correction data block generation process includes a virtual data block composed of fixed data and the virtual data block when the data block that does not reach a predetermined number is generated at the end of data recording. An error correction code is generated for a data block, an address is added, and the corrected data block having the same format as the data block is generated. 3. The recording method according to claim 2, wherein in the correction data block generation process, at the end of data recording, the data blocks that do not reach a predetermined number are generated, and the virtual data block and the data block including fixed data are generated. On the other hand, after generating an error correction code and generating and recording the corrected data block of the same format as the data block,
When adding data, an error correction process is performed using the data blocks that do not reach a predetermined number, the virtual fixed data, and a correction data block added thereto,
An error correction code is generated for a combination of the data block to be reproduced and the data block to be additionally written, and the correction data block having the same format as the data block is generated,
A method for recording digital information, characterized in that information on replacement of an address of a correction data block in which an additional point is registered and an address of a correction data block to be newly recorded is recorded in a specific area of the recording medium. A recording method for recording digital information on a recording medium,
A data block is generated for the input data in a predetermined unit,
A correction code is added to the data block to generate a data cluster,
Modulating the data cluster, recording on a recording medium,
Playing back the recorded data cluster from the recording medium,
Count the number of errors a contained in the data cluster,
If a ≦ m with respect to a predetermined natural number n, m where n> m, the data block generation, data cluster generation, modulation processing, and recording are continued.
If n <a ≦ n, the data cluster is reproduced, the data cluster is subjected to correction processing to reproduce the data block,
An error correction code is generated for a predetermined number of data blocks, a correction data block having the same format as the data block is generated,
A correction data block is further added to the correction data block to generate a data cluster,
Modulate the data cluster generated from the corrected data block, record it on the recording medium,
Record the address information of the correction block in a specific area of the recording medium,
If m <a, a new data block is generated for the same data as the data block where m <a.
A data cluster is generated by adding a block-by-block correction code to the newly generated data block,
Modulate the newly generated data cluster, record it on the recording medium,
A method for recording digital information, comprising: recording information on a relationship between a data cluster based on a specific area of a recording medium and an address of a newly recorded data cluster. A data block is generated for the input data in a predetermined unit, an error correction code is generated for a predetermined number of blocks of data, and a correction data block of the same format as the data block is generated, A correction code is added to the correction data block and the data block to generate a data cluster, the data cluster is modulated and recorded, and the address information of the previous correction data block is recorded in a specific area of the recording medium. A method for reproducing digital information from a recorded medium,
Get the address information of the correction block from a specific area of the recording medium,
User data is read from the recording medium and demodulated,
Correcting each demodulated data cluster, obtaining the corrected data block according to the data block and the address information of the obtained corrected block,
A method for reproducing digital data, comprising: performing correction processing using a data block and the correction data block according to the acquired address information of the correction block. A data block is generated for the input data in a predetermined unit,
Generating an error correction code for a predetermined number of data blocks of the data block, generating a correction data block of the same format as the data block;
A user recording area in which a data cluster is recorded by adding a correction code to each block unit in the correction data block and the data block;
A digital information recording medium having a management area in which address information of the correction data block is recorded. A recording device for recording digital information on a recording medium,
An error correction code is generated for data of a predetermined number of data blocks for a data block generated by inputting a predetermined unit of input data, and a correction data block having the same format as the data block is generated. An inter-cluster error correction code generation circuit to generate,
An intra-cluster error correction code generation circuit for adding a correction code to each block unit of the correction data block and the data block;
A modulation circuit that performs modulation processing on a data cluster generated by adding a correction code to each block unit;
A digital information recording apparatus comprising management information control means for generating a data block from address information of the corrected data block according to a generation status of the inter-cluster error correction code generation circuit.   10. The recording apparatus according to claim 9, wherein the inter-cluster error correction code generation circuit virtually generates a data block having fixed data when an input data block becomes a unit less than a predetermined number. An apparatus for recording digital information, wherein a correction data block having the same format as the data block is generated from the input data block and the virtual data block. 10. The recording apparatus according to claim 9, wherein the inter-cluster error correction code generation circuit generates a data block having virtually fixed data, wherein the input data block is a unit that is less than a predetermined number, When a correction data block having the same format as the data block is generated from the data block and the virtual data block and added to the recorded medium, the data block having a unit less than the predetermined number is reproduced from the recording medium. , And a predetermined number with the input data, to generate a correction data block of the same format as the data block,
The digital information recording apparatus, wherein the management information control means generates a data block from address change information of the corrected data block. A data block is generated for the input data in a predetermined unit,
An error correction code is generated for the data of a predetermined number of data blocks, a correction data block having the same format as the data block is generated, and the previous correction data block and the data block are corrected for each block. A reproduction apparatus for generating a data cluster by adding a code, performing modulation processing on the data cluster, and further reproducing information from a recording medium in which address information of the corrected data block is recorded in a specific area,
In-cluster error correction processing circuit that performs error correction processing in units of blocks, and
Management information control means for detecting address information of the correction data block from the recording medium;
An apparatus for reproducing digital information, comprising: an inter-sector error correction circuit for performing error correction processing between the data blocks in accordance with the management information control means.   8. The recording method and reproducing method according to claim 1, wherein the recording medium is a write-once recording medium.

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