JP2013077345A - Data recording method, data reproduction method, data recorder and data reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability, capacity efficiency and convenience of data.SOLUTION: A data recording and reproduction device reads a second error correction code and performs error correction by the second error correction code when error uncorrectability occurs in error correction by a first error correction code. Since error correction by the second error correction code can be performed even though error correction by the first error correction code becomes uncorrectable, data reliability can be improved. Further, recording, reproduction and erasure of a file unit are achieved by giving the second error correction code in a file unit, and capacity efficiency and convenience can be improved.

Description

  The present invention relates to a data recording device and a data reproducing device.

  There exists Unexamined-Japanese-Patent No. 2010-218590 as background art of this technical field. In this publication, “parity having the same structure as a normal data cluster is added and the added position is shown in the same format as the defect management. Therefore, while maintaining high compatibility with conventional devices, Can improve the reliability. "

JP 2010-218590 A

  In Patent Document 1, “in a recording / reproducing apparatus for an optical disc recorded in a format in which reliability is ensured by adding parity in cluster units, parity can be added while maintaining the cluster format. A device that records and reproduces data according to a format in which parity is added in cluster units to ensure reliability can be improved with a small amount of addition "is described, but the reliability is improved. Therefore, it is necessary to add a circuit to the recording / reproducing apparatus.

  Accordingly, the present invention provides a data recording / reproducing apparatus capable of performing error correction by adding a second error correction code without requiring addition of a new circuit.

  The object of the present invention can be achieved by, for example, the invention described in the claims.

  According to the present invention, the reliability of data can be improved.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

The block diagram which shows the structure of the data recording / reproducing apparatus of a 1st Example. The block diagram which shows the structure of the signal processing circuit of a 1st Example. 6 is a flowchart illustrating a data recording processing procedure according to the first embodiment. 6 is a flowchart showing a data reproduction processing procedure according to the first embodiment. The figure which shows the cluster structure of the data of a 1st Example. The figure which shows the cluster structure of the data of a 1st Example. The figure which shows the cluster structure of the data of a 2nd Example. The figure which shows the cluster structure of the data of a 3rd Example. The figure which shows the cluster structure of the data of a 4th Example. The figure which shows the cluster structure of the data of a 5th Example. The figure which shows arrangement | positioning of the data of a 6th Example The figure which shows data arrangement | positioning of 7th Example The figure which shows data arrangement | positioning of 8th Example The figure which shows data arrangement | positioning of 9th Example The figure which shows the arrangement | positioning of the data of a 10th Example The figure which shows data arrangement | positioning of 11th Example The figure which shows data arrangement | positioning of 12th Example

  Embodiments will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of a data recording / reproducing apparatus according to the first embodiment of the present invention. A data recording / reproducing apparatus 1 records data input from a host computer on a recording medium. Also, the data reproduced from the recording medium is output to the host computer. Reference numeral 2 denotes a data recording medium, for example, a BD-R (Blu-ray Disc Recordable). In the following description, the optical disk 2 will be described. The data recording medium is not necessarily limited to the optical disk, and may be a recording medium such as a magneto-optical disk or a hologram.

  An optical pickup 3 is controlled by the servo circuit 8 to read a signal from the optical disk 2 and send it to the amplifier circuit 4. Further, the modulation signal sent from the signal processing circuit 5 is recorded on the optical disc 2.

  An amplification circuit 4 amplifies a reproduction signal read from the optical disc 2 via the optical pickup 3 and sends it to the signal processing circuit 5. A servo signal is generated and sent to the servo circuit 8. The amplifier circuit 4 is mounted by, for example, AFE (Analog Front End).

  Reference numeral 5 denotes a signal processing circuit, which demodulates an input signal to solve the interleaving, performs error correction, and sends the scrambled data to the interface circuit 6. The data sent from the interface circuit 6 is scrambled, an error correction code is added, interleaved, modulated, and sent to the optical pickup 3.

  Reference numeral 6 denotes an interface circuit which sends data sent from the signal processing circuit 5 to the host computer. Also, the data sent from the host computer is sent to the signal processing circuit 5. The interface circuit 6 performs data transfer based on, for example, a SATA (Serial Advanced Technology Attachment) or other transfer method.

  Reference numeral 7 denotes a CPU (Central Processing Unit) which controls the recording process and the reproduction process of the data recording / reproducing apparatus 1. Note that, instead of the CPU, an arbitrary control circuit or a dedicated circuit such as an ASIC (Application Specific Integrated Circuit) may be used.

  A servo circuit 8 controls the optical pickup 3 according to a servo signal generated by the amplifier circuit 4 and an instruction from the CPU 7.

  Next, the operation of the data recording / reproducing apparatus 1 when recording data on the optical disc 2 will be described. When the optical disk 2 is loaded in the data recording / reproducing apparatus 1, the CPU 7 performs a setup process for the optical disk 2 via the optical pickup 3, the amplifier circuit 4, and the servo circuit 8.

  When the data is sent from the host computer to the data recording / reproducing apparatus 1, the data is received by the interface circuit 6, scrambled by the signal processing circuit 5, added with an error correction code, interleaved, data modulated, and optically modulated. The image is sent to the pickup 3 and recorded on the optical disc 2. The error correction codes added by the signal processing circuit 5 are the first error correction code generated by the first error correction sequence and the second error correction code generated by the second error correction sequence.

  Next, the operation of the data recording / reproducing apparatus 1 when reproducing data from the optical disc 2 will be described. When the optical disk 2 is loaded in the data recording / reproducing apparatus 1, the CPU 7 performs a setup process for the optical disk 2 via the optical pickup 3, the amplifier circuit 4, and the servo circuit 8.

  When data is requested from the host computer to the data recording / reproducing apparatus 1, the signal read from the optical disk 2 through the optical pickup 3 is amplified by the amplifier circuit 4, the data is demodulated by the signal processing circuit 5 and the interleaving is released Then, error correction is performed, descrambling is performed, and data is sent to the host computer via the interface circuit 6. The error correction code used when the signal processing circuit 5 performs error correction includes a first error correction code generated by the first error correction sequence and a second error correction code generated by the second error correction sequence. It is. First, error correction is performed using the first error correction code, and when correction is impossible, error correction is performed using the second error correction code.

  FIG. 2 is a block diagram showing a configuration of the signal processing circuit 5. Reference numeral 5 denotes a signal processing circuit, which demodulates the input signal sent from the amplifier circuit, solves the interleaving, performs error correction, and sends the scrambled data to the interface circuit. Also, the data sent from the interface circuit is scrambled, an error correction code is added, interleaved, modulated, and sent to the optical pickup.

  A demodulation circuit 21 demodulates the input signal by 1-7PP and sends it to the deinterleave circuit 22. Reference numeral 22 denotes a deinterleave circuit, which deinterleaves the data sent from the demodulation circuit 21 and writes it in the memory 23. A memory 23 is used as an error correction memory, an error correction code addition memory, and a buffer memory. The memory 23 is implemented by, for example, a DRAM (Dynamic Random Access Memory) or an SRAM (Static Random Access Memory).

  Reference numeral 24 denotes an error correction and error correction code addition circuit which reads data from the memory 23, corrects the error, writes the data to the memory 23, and notifies the CPU when correction is impossible. Further, the data is read from the memory 23 to generate an error correction code and written to the memory 23.

  Reference numeral 25 denotes a descrambling circuit which unscrambles the data for which error correction has been completed and sends it to the interface circuit.

  A scramble circuit 26 scrambles the data sent from the interface circuit and writes it in the memory 23.

  An interleave circuit 27 interleaves the data read from the memory 23 and sends it to the modulation circuit 28.

  A modulation circuit 28 modulates the data sent from the interleaving circuit 27 by 1-7PP and sends it to the optical pickup.

  A data copy circuit 29 copies data in the memory 23 according to an instruction from the CPU and pastes it in another area in the memory 23. Thereby, data in a certain area of the memory 23 can be copied in a certain order, and can be rearranged and pasted in another area in the memory 23 in a different order. For example, by rearranging the second error correction sequence into the first error correction sequence, the first error correction code and the second error correction code are generated using the same error correction and error correction code addition circuit. can do. Further, by rearranging the second error correction sequence to the first error correction sequence, error correction by the first error correction code and second error correction can be performed using the same error correction and error correction code addition circuit. Error correction using codes can be performed.

  Next, the operation of the signal processing circuit 5 for the data sent from the interface circuit when data is recorded on the optical disc will be described. Data sent from the interface circuit is scrambled by the scramble circuit 26 and written to the memory 23.

  Then, an error correction and error correction code adding circuit 24 adds an error correction code to the data written in the memory 23. The error correction codes to be added are the first error correction code generated by the first error correction sequence and the second error correction code generated by the second error correction sequence. First, data is read from the memory 23 using the first error correction sequence, and a first error correction code is generated and written to the memory 23. Next, data is copied in order from the memory 23 in the second error correction sequence, and the first error correction sequence is rearranged and pasted in another area in the memory 23. Then, data is read from the memory 23 with the first error correction sequence, and an error correction code is generated and written to the memory 23. The error correction code generated at this time is generated by the second error correction sequence, and is the second error correction code. Further, an error correction code is generated and added to the generated second error correction code.

  Then, interleaving is performed by the interleaving circuit 27, 1-7PP modulation is performed by the modulation circuit 28, and the result is sent to the optical pickup.

  Next, the operation of the signal processing circuit 5 with respect to the input signal from the amplifier circuit when reproducing data from the optical disk will be described. The input signal from the amplifier circuit is demodulated by the demodulator circuit 21, deinterleaved by the deinterleave circuit 22, and written in the memory 23.

  Then, the error correction and error correction code adding circuit 24 performs error correction of the data written in the memory 23. First, data is read from the memory 23 using the first error correction sequence, and error correction is performed using the first error correction code. If no correction is possible, descrambling circuit 25 unscrambles the data and sends data to interface circuit 6.

  When correction is impossible, the CPU is notified, and the data copy circuit 29 sequentially copies data from the memory 23 in the second error correction sequence according to the instruction of the CPU, and the first error correction sequence is stored in another area in the memory 23. Sort and paste to. Then, data is read from the memory 23 with the first error correction sequence, and error correction is performed with the second error correction code. Next, the error-corrected data is copied by the data copy circuit 29 and pasted at the original data position. Then, the descrambling circuit 25 unscrambles the data and sends the data to the interface circuit 6.

  FIG. 3 is a flowchart showing the error correction code addition processing procedure of the data recording / reproducing apparatus of the first embodiment, and FIG. 4 is a flowchart showing the error correction processing procedure.

  In BD-R, user data input from the host computer is divided into 2048-byte sectors, and then a 4-byte error detection code is added to collect 32 sectors, which are then arranged in a 216 row x 304 column matrix. In addition, an error correction code generated by a 32-byte Reed-Solomon code is added every 216 bytes to form a 248 row × 304 column structure. This is a cluster, and erasure correction of up to 32 bytes can be performed with position information indicated by BIS (Burst Indicator Subcode).

  On the other hand, FIGS. 3 and 4 show an example in which an error correction code generated by a Reed-Solomon code of 32 bytes is added every 224 bytes and the configuration of 256 rows × 304 columns is used as a cluster.

  FIG. 3 shows a procedure for collecting a plurality of clusters having such a structure (here, 7 clusters) and adding one cluster of only correction codes thereto.

  First, in step S301, an error correction code is generated with the first error correction sequence and added to the memory. This is the first error correction code, and error correction code addition is performed for seven clusters.

  Next, in step S302, the data is copied in the order of the second error correction series, and is pasted in another area 1 on the memory in the order of the first error correction series. This is performed for 304 columns.

  Next, in step S303, 32 bytes × 304 error correction codes are generated. In step S304, these are copied and pasted in another area 2 on the memory. This is the second error correction code. If steps S302 to S304 are repeated seven times, error correction codes for seven clusters have been added. move on.

  In step S306, a first error correction code is generated for the second error correction code pasted in another area 2 on the memory. When this is done for 304 columns, a second error correction code cluster of one cluster size is completed.

  Next, in step S307, a total of 8 clusters obtained by adding one second error correction code cluster to seven data clusters to which the first error correction has been added are recorded on the optical disc.

  In FIG. 3, first, a first error correction code for 7 clusters is generated, then a second error correction code is generated, and then a first error correction code for the second error correction code is generated. As an example, firstly, a second error correction code for 7 clusters is generated, then a first error correction code for 7 clusters is generated, and then a first error correction code for the second error correction code is generated. May be generated.

  FIG. 4 shows a procedure for reproducing data recorded on the optical disc in the processing procedure of FIG.

  First, in step S401, seven data clusters are reproduced from the optical disc, and error correction is performed using the first error correction sequence in step S402.

  Next, in step S403, it is determined whether or not correction has occurred. If no uncorrectable error has occurred, the process ends. If an uncorrectable error has occurred, the second error correction code cluster is reproduced in step S404, and error correction is performed using the first error correction sequence in step S405.

  Next, in step S406, it is determined whether or not correction has occurred. If uncorrectable has occurred, a data error is notified to the host computer in step S407, and the process ends. If uncorrectable has not occurred, data is copied from the seven data clusters in the order of the second error correction sequence in step S408, and is pasted in another area 1 on the memory in the order of the first error correction sequence. This is performed for 304 columns.

  In step S409, error correction is performed using the first error correction sequence. In step S408, the data is copied in the order of the second error correction sequence and pasted in the order of the first error correction sequence, so that the error correction is performed with the second error correction sequence.

  In step S410, the error-corrected data is copied and pasted into the data cluster. This is performed for 304 columns. If there is a column that does not require error correction, it is not necessary to copy and paste data for that column. If steps S408 to S410 are repeated seven times, error correction codes for seven clusters have been performed. Therefore, if it is determined in step S411 that the processing has been completed seven times, the processing is terminated.

  FIG. 5 is a diagram showing a cluster structure of data recorded on an optical disk by the data recording / reproducing apparatus according to the first embodiment of the present invention. A first error correction sequence and a second error correction sequence are formed by the first error correction code and the second error correction code, and if the error cannot be corrected by the first error correction sequence, the second error correction sequence Errors can be corrected.

  This is an example in which an error correction code generated by a 32-byte Reed-Solomon code is added every 32 bytes × 7 = 224 bytes in both error correction sequences, and an error of up to 32 bytes can be corrected respectively.

  Further, this is an example in which a configuration of 256 bytes × 304 is used as a cluster. A cluster for recording data is a data cluster, and a cluster for recording a second error correction code is a second error correction code cluster. One second error correction code cluster is recorded for seven data clusters. The first error correction code is added to the second error correction code cluster.

  Since the first error correction series is a series in the horizontal direction in the figure and the second error correction series is a series in the vertical direction in the figure, for example, in the data cluster 5, an error cannot be corrected by error correction in the first error correction series. In such a case, correction can be performed by error correction using the second error correction sequence.

  In addition, since the second error correction sequence has the same number of bytes of data and error correction code as the first error correction sequence, error correction can be performed with exactly the same circuit.

  In the example of the second error correction sequence A and the second error correction sequence B in the figure, the data error included in the user data is 32 bytes, and the data error can be corrected by the second error correction code.

  In FIG. 5, the second error correction series is a series in the vertical direction of the figure, but may be a series in an oblique direction as shown in FIG. In this case, in the example of the second error correction sequence A and the second error correction sequence B in FIG. 6, the position of the error data included in the user data is different from that in FIG. 5, but the data error included in the user data is The same 32 bytes as in FIG. 5, and the data error can be corrected by the second error correction code.

  With the above configuration, in the first embodiment of the present invention, the first error correction code is added to the data at the time of data recording, and then the second error correction code is added. Error correction using a correction code is performed. When error correction is impossible, the second error correction code is read and error correction is performed using the second error correction code. Since the error correction by the second error correction code can be performed even if the error correction by the first error correction code becomes uncorrectable, the reliability of the data can be improved.

  Furthermore, since error correction using the second error correction code is performed by rearranging data, no additional circuit is required in the data recording / reproducing apparatus.

  FIG. 7 is a diagram showing a data cluster structure according to the second embodiment of the present invention. As in the first embodiment, the first error correction sequence and the second error correction sequence are formed by the first error correction code and the second error correction code, and the error cannot be corrected by the first error correction sequence. The error can be corrected by the second error correction sequence.

  An error correction code generated by a Reed-Solomon code of 32 bytes is added to the first error correction series every 36 bytes × 6 = 216 bytes, and every 36 bytes × 6 = 216 bytes is added to the second error correction series. In this example, an error correction code generated by a 36-byte Reed-Solomon code is added, and errors of up to 32 bytes and 36 bytes can be corrected.

  Further, this is an example in which the configuration of 248 bytes × 304 is a cluster. A cluster for recording data is a data cluster, and a cluster for recording a second error correction code is a second error correction code cluster. One second error correction code cluster is recorded for six data clusters. The first error correction code is added to the second error correction code cluster.

  Since the first error correction series is a series in the horizontal direction in the figure and the second error correction series is a series in the vertical direction in the figure, for example, in the data cluster 5, an error cannot be corrected by error correction in the first error correction series. In such a case, correction can be performed by error correction using the second error correction sequence.

  In the example of the second error correction sequence A and the second error correction sequence B in the figure, the data error included in the user data is 36 bytes, and the data error can be corrected by the second error correction code.

  Unlike the first embodiment, since the number of bytes of the error correction code in the second error correction sequence is not the same as that in the first error correction sequence, error correction cannot be performed with the exact same circuit. The number of data clusters for one cluster is not limited to six or seven. For this reason, the number of data clusters can be freely increased from six or seven. Further, the number of data clusters can be changed on the inner and outer circumferences of the optical disk.

  With the above configuration, in the second embodiment of the present invention, the first error correction code is added to the data during data recording, and then the second error correction code is added. Error correction using a correction code is performed. When error correction is impossible, the second error correction code is read and error correction is performed using the second error correction code. Since the error correction by the second error correction code can be performed even if the error correction by the first error correction code becomes uncorrectable, the reliability of the data can be improved.

  Furthermore, the number of data clusters for one second error correction code cluster can be freely increased as compared with the first embodiment. Further, the number of data clusters can be changed on the inner and outer circumferences of the optical disk.

  FIG. 8 is a diagram showing a data cluster structure according to the third embodiment of the present invention. As in the first embodiment, the first error correction sequence and the second error correction sequence are formed by the first error correction code and the second error correction code, and the error cannot be corrected by the first error correction sequence. The error can be corrected by the second error correction sequence.

  This is an example in which an error correction code generated by a Reed-Solomon code of 32 bytes is added every 32 bytes × 6 + 24 bytes = 216 bytes in both error correction sequences, and errors of up to 32 bytes each can be corrected. .

  Further, this is an example in which the configuration of 248 bytes × 304 is a cluster. A cluster for recording data is a data cluster, and a cluster for recording a second error correction code is a second error correction code cluster. One second error correction code cluster is recorded for seven data clusters.

  Since the first error correction series is a series in the horizontal direction in the figure and the second error correction series is a series in the diagonal direction in the figure, for example, in the data cluster 5, an error cannot be corrected by error correction in the first error correction series. In such a case, correction can be performed by error correction using the second error correction sequence.

  In addition, since the second error correction sequence has the same number of bytes of data and error correction code as the first error correction sequence, error correction can be performed with exactly the same circuit.

  In the example of the second error correction sequence A, the second error correction sequence B, and the second error correction sequence C in the figure, the data error included in the user data is 32 bytes, and the data error is caused by the second error correction code. Can be corrected.

  However, in the example of the second error correction sequence C, since the second error correction code in the second error correction code cluster is only 24 bytes, the cluster including the 24 bytes is referred to as the second error correction code cluster 1, and further the second error correction code cluster. A correction code cluster 2 is provided to record the missing 8 bytes.

  One second error correction code cluster 2 is recorded for 27 × 7 data clusters. The first error correction code is added to the second error correction code cluster 1 and the second error correction code cluster 2.

  With the above configuration, in the third embodiment of the present invention, the first error correction code is added to the data at the time of data recording and then the second error correction code is added. Error correction using a correction code is performed. When error correction is impossible, the second error correction code is read and error correction is performed using the second error correction code. Since the error correction by the second error correction code can be performed even if the error correction by the first error correction code becomes uncorrectable, the reliability of the data can be improved.

  Furthermore, since error correction using the second error correction code is performed by rearranging data, no additional circuit is required in the data recording / reproducing apparatus.

  Furthermore, even if there is a sequence in which the number of bytes of the second error correction code is insufficient, error correction can be performed by recording the shortage in another cluster.

  FIG. 9 is a diagram showing a data cluster structure according to the fourth embodiment of the present invention. As in the first embodiment, the first error correction sequence and the second error correction sequence are formed by the first error correction code and the second error correction code, and the error cannot be corrected by the first error correction sequence. The error can be corrected by the second error correction sequence.

  This is an example in which an error correction code generated by a Reed-Solomon code of 32 bytes is added every 32 bytes × 6 + 24 bytes = 216 bytes in both error correction sequences, and errors of up to 32 bytes each can be corrected. .

  Further, this is an example in which the configuration of 248 bytes × 304 is a cluster. A cluster for recording data is a data cluster, and a cluster for recording a second error correction code is a second error correction code cluster. One second error correction code cluster is recorded for seven data clusters.

  Since the first error correction series is a series in the horizontal direction in the figure and the second error correction series is a series in the diagonal direction in the figure, for example, in the data cluster 5, an error cannot be corrected by error correction in the first error correction series. In such a case, correction can be performed by error correction using the second error correction sequence.

  In the example of the second error correction sequence A, the second error correction sequence B, and the second error correction sequence C in the figure, the data error included in the user data is 32 bytes, and the data error is caused by the second error correction code. Can be corrected.

  In addition, since the second error correction sequence has the same number of bytes of data and error correction code as the first error correction sequence, error correction can be performed with exactly the same circuit.

  However, in the example of the second error correction sequence C, since the second error correction code in the second error correction code cluster is only 24 bytes, the missing 8 bytes are recorded in the control data area. For example, the control data area of BD-R is 576 bytes per cluster. The second error correction code that does not fit in the second error correction code cluster is 304 × 8 bytes, and can be distributed and recorded in each cluster by 304 bytes.

  With the above configuration, in the fourth embodiment of the present invention, the first error correction code is added to the data at the time of data recording, and then the second error correction code is added. Error correction using a correction code is performed. When error correction is impossible, the second error correction code is read and error correction is performed using the second error correction code. Since the error correction by the second error correction code can be performed even if the error correction by the first error correction code becomes uncorrectable, the reliability of the data can be improved.

  Furthermore, since error correction using the second error correction code is performed by rearranging data, no additional circuit is required in the data recording / reproducing apparatus.

  Furthermore, even when there is a sequence in which the number of bytes of the second error correction code is insufficient, error correction can be performed by recording in the control data area.

  Further, error correction can be performed without providing a new cluster as in the third embodiment.

  FIG. 10 is a diagram showing a data cluster structure according to the fifth embodiment of the present invention. As in the first embodiment, the first error correction sequence and the second error correction sequence are formed by the first error correction code and the second error correction code, and the error cannot be corrected by the first error correction sequence. The error can be corrected by the second error correction sequence.

  This is an example in which an error correction code generated by a Reed-Solomon code of 32 bytes is added every 32 bytes × 6 + 24 bytes = 216 bytes in both error correction sequences, and errors of up to 32 bytes each can be corrected. .

  Further, this is an example in which the configuration of 248 bytes × 304 is a cluster. A cluster for recording data is a data cluster, and a cluster for recording a second error correction code is a second error correction code cluster. One second error correction code cluster is recorded for six data clusters.

  Since the first error correction series is a series in the horizontal direction in the figure and the second error correction series is a series in the vertical direction in the figure, for example, in the data cluster 5, an error cannot be corrected by error correction in the first error correction series. In such a case, correction can be performed by error correction using the second error correction sequence.

  In addition, since the second error correction sequence has the same number of bytes of data and error correction code as the first error correction sequence, error correction can be performed with exactly the same circuit.

  In the example of the second error correction sequence A and the second error correction sequence B in the figure, the data error included in the user data is 32 bytes, and the data error can be corrected by the second error correction code.

  In the example of the second error correction sequence A, 24 bytes of dummy data are inserted so that the number of bytes of the error correction code for the data is the same as that of the first error correction sequence. The dummy data may be 00h and FFh, for example.

  In the example of the second error correction sequence B, 72 bytes of dummy data are inserted in order to make the number of bytes of the data and the error correction code the same as the first error correction sequence. In this example, the second error correction code is 24 bytes, but at the time of recording, 32 bytes are generated and only 24 bytes are recorded on the optical disk. At the time of reproduction, 24 bytes are reproduced from the optical disc, and the same processing as that for data error is applied to the missing 8 bytes. In this series, since the data error is 24 bytes, a data error of a total of 32 bytes can be corrected by making these 8 bytes the same processing as the data error.

  With the above configuration, in the fifth embodiment of the present invention, the first error correction code is added to the data at the time of data recording and then the second error correction code is added. Error correction using a correction code is performed. When error correction is impossible, the second error correction code is read and error correction is performed using the second error correction code. Since the error correction by the second error correction code can be performed even if the error correction by the first error correction code becomes uncorrectable, the reliability of the data can be improved.

  Furthermore, since error correction using the second error correction code is performed by rearranging data, no additional circuit is required in the data recording / reproducing apparatus.

  Further, error correction can be performed without providing a new cluster as in the third embodiment and without recording in the control data area as in the fourth embodiment.

  The configuration and processing procedure of the apparatus of the sixth embodiment are the same as those of the third embodiment, and only the arrangement of data of the second error correction series is different. FIG. 11 is a diagram showing the data arrangement of the sixth embodiment.

  The optical disk of the present embodiment is equally divided into a plurality of data zones having an address length a × b in which the address length of the user data area is equally divided into ten. 1101 is one of the data zones.

  One of the data zones in the optical disc is a second error correction code zone for recording the second error correction code cluster, and 1102 at the end of the address is the second error correction code zone.

  In the third embodiment, the second error correction sequence is configured by the data cluster 1 to the data cluster 7 and the second error correction code cluster as shown in FIG. Construct an error correction sequence. That is, instead of the data cluster 1 to the data cluster 7, a data cluster is extracted one by one from each data zone other than the second error correction code zone, and a second error correction code cluster is generated. The error correction code cluster is recorded in the second error correction code zone.

  1103 to 1110 are data clusters forming a second error correction sequence, and 1111 is an error correction code cluster of the second error correction sequence. The error correction code cluster 1111 is generated from the clusters 1103 to 1110.

  By adopting the present embodiment, the clusters 1103 to 1111 forming the second error correction series are discretely arranged in the user data area of the optical disc, and for example, the first error correction in the data zone 1101 becomes impossible. Even if a burst error occurs, if data in another data zone can be reproduced by the first error correction, the data can be correctly reproduced by the second error correction.

  Note that the first error correction code and the second error correction code of the present embodiment are not limited to Reed-Solomon codes, and may be single parity detection codes, for example.

  Further, the one that generates the first error correction code and the second error correction code of the present embodiment is not limited to the error correction and error correction code addition circuit 24 in the signal processing circuit 5, but operates on a CPU, for example. May be generated by software.

  Further, the division of the optical disk of the present embodiment is not limited to 10 equal parts.

  In FIG. 11, the error correction code zone 1102 is arranged at the end of the address of the user data area, but it may be arranged in any data zone.

  With the above configuration, in the sixth embodiment of the present invention, the clusters forming the second error correction sequence are discretely arranged, so that it is more resistant to burst errors than the first embodiment, and further improves data reliability. Can be increased.

  The configuration and processing procedure of the apparatus of the seventh embodiment are the same as those of the third embodiment, as in the sixth embodiment, and only the arrangement of data in the second error correction sequence is different. FIG. 12 is a diagram showing the data arrangement of the seventh embodiment.

  The optical disk of this embodiment is divided into four partitions having arbitrary address lengths c, d, e, and f with respect to the address length of the user data area. Reference numeral 1213 denotes one of the partitions.

  Further, each partition is divided into a plurality of data zones, and the partition 1213 is equally divided into data zones having an address length a × b ′ in which the address length c is equally divided into ten. 1201 is one of data zones for recording data, and 1202 is a second error correction code zone for recording a second error correction code cluster.

  Other partitions other than the partition 1213 are equally divided into address length d / 10, e / 10, or f / 10 data zones in which the address length d, e, or f is equally divided into 10 like the partition 1213. The

  In the present embodiment, in each partition, the second error correction sequence is configured by a cluster of each data zone. Therefore, the second error correction code can be generated for each partition.

  1203 to 1211 are data clusters of the second error correction sequence, and 1212 is a second error correction code cluster. The second error correction code cluster 1212 is generated from the clusters 1203 to 1211 and recorded in the second error correction code zone 1202.

  By adopting this embodiment, it is possible to generate a second error correction code for each partition, and when adding data to each partition, it is possible to generate a second error correction code without reading the data already recorded on the optical disk. , The convenience of additional recording can be ensured.

  Note that the partitioning of this embodiment is not limited to 10 equal parts, and may be equally divided into different numbers for each partition.

  Further, the optical disk of the present embodiment is not limited to being divided into four partitions.

  With the above configuration, in the seventh embodiment of the present invention, the clusters forming the second error correction sequence are discretely arranged, so that it is more resistant to burst errors than the first embodiment, and more reliable in data. Can be increased.

  Furthermore, when additional recording is performed in units of partitions, an error correction code can be generated without reading data already recorded on the optical disc, and the convenience of additional recording can be ensured compared to the sixth embodiment.

  The configuration and processing procedure of the apparatus of the eighth embodiment are the same as those of the third embodiment, as in the sixth embodiment, and only the arrangement of data in the second error correction sequence is different. FIG. 13 is a diagram showing the data arrangement of the eighth embodiment.

  1300 to 1308 are optical disks for recording user data, and 1309 is an error correction code disk on which a second error correction code cluster is recorded.

  One optical zone is assigned to each optical disk. The last optical disk is an error correction code disk. The optical disks 1300 to 1308 and the error correction disk 1309 have the same capacity, and have the same user data area address length. Reference numeral 1310 denotes one of data zones, which is assigned to the optical disc 1300.

  Reference numeral 1311 denotes a second error correction code zone for recording the second error correction code cluster.

  In the present embodiment, the second error correction sequence for the data zone is handled in the same manner as in the sixth embodiment, and the second error correction sequence is constituted by the clusters in each data zone. That is, a second error correction code cluster is generated from data clusters in each data zone other than the second error correction zone, and the second error correction code cluster is recorded in the second error correction zone.

  As a result, the second error correction code cluster is recorded only on the error correction disk 1309 assigned to the second error correction code cluster.

  Reference numerals 1312 to 1320 denote data clusters of the second error correction sequence, and 1321 denotes a second error correction code cluster. The second error correction code cluster 1321 is generated from the clusters 1312 to 1320.

  By adopting this embodiment, the clusters 1312 to 1321 constituting the second error correction series are discretely arranged on different optical disks, so that even if data on one optical disk is lost, for example, If the data on the optical disc can be corrected by the first error, the data can be correctly reproduced.

  In the above description, the last optical disk is an error correction code disk, but the error correction code disk may be another optical disk.

  Further, the optical disk group of the present embodiment is not limited to the same capacity, and even the optical disk group including optical disks of different capacities is equal to the address length of the user data area of the optical disk having the minimum capacity. A data zone having an address length may be assigned to each optical disc.

  With the above-described configuration, in the eighth embodiment of the present invention, the reliability of data is further improved compared to the sixth embodiment by discretely arranging the clusters forming the second error correction sequence on another optical disk. be able to.

  The configuration and processing procedure of the apparatus of the ninth embodiment are the same as those of the third embodiment, as in the sixth embodiment, and only the arrangement of data in the second error correction sequence is different. FIG. 14 is a diagram showing the data arrangement of the ninth embodiment.

  The graph at the top of FIG. 14 is a graph showing the relationship between the radial position and the address of the optical disc. The vertical axis of the graph shows the radial position and the horizontal axis shows the address of the optical disc.

  As in the sixth embodiment, the optical disk of this embodiment is divided into a plurality of data zones, and the second error correction sequence is formed from clusters of the respective data zones. However, unlike the sixth embodiment, the optical disc is divided into 10 zones whose address length increases as the radial position goes to the outer peripheral side. And, as shown in FIG. 14, the fifth and sixth zones, the seventh and fourth zones, the third and eighth zones, the ninth and second zones, the first and tenth zones, Each zone is combined into five data zones. The address length of each data zone is the same.

  1401 is one of the data zones, and the last data zone 1402 of the user data area is a second error correction code zone.

  In the present embodiment, as in the sixth embodiment, the second error correction sequence is configured by the clusters of the respective data zones. That is, a second error correction code cluster is generated from data clusters extracted one by one from each data zone other than the second error correction code zone, and the second error correction code cluster is converted into the second error correction code zone. To be recorded.

  Reference numerals 1406 to 1409 denote data clusters of the second error correction sequence, and reference numeral 1410 denotes a second error correction code cluster. The second error correction code cluster 1410 is generated from the data clusters 1406 to 1409.

  By adopting this embodiment, in the data zone in which the address length of the user data area of the optical disc is divided equally, the feature that the radial distance of the data zone becomes shorter as it goes to the outer periphery of the optical disc is relaxed. The clusters forming the error correction series can be arranged at a certain radial distance interval or more. Thereby, it becomes possible to correct the burst error of the first error correction with a certain radial distance with the second error correction code regardless of the radial position of the optical disk.

  With the above configuration, in the ninth embodiment of the present invention, the reliability of data is further improved compared to the sixth embodiment by arranging the clusters forming the second error correction sequence at a certain radial distance interval or more. be able to.

  The configuration and processing procedure of the apparatus of the tenth embodiment are the same as those of the third embodiment as in the sixth embodiment, and only the arrangement of data of the second error correction sequence is different. FIG. 15 shows the data arrangement of the tenth embodiment.

  As in the sixth embodiment, the optical disk of this embodiment is divided into a plurality of data zones, and the second error correction sequence is formed from clusters of the respective data zones. However, unlike the sixth embodiment, the optical disc has a file system management area.

  Reference numerals 1503 and 1512 denote file system management areas arranged at the head and tail of the user data area of the optical disc. The file system is, for example, UDF (Universal Disk Format).

  The management areas 1503 and 1512 mirror data, and the file system functions if either data exists.

  For the optical disk, the management areas 1503 and 1512 are excluded from the data zone of the address length a × b obtained by dividing the address length obtained by subtracting from the address length of the user data area of the optical disk by the address length of the management areas 1503 and 1512. The user data area is divided equally. The last data zone 1502 is a second error correction zone for recording the second error correction code cluster.

  In the present embodiment, as in the sixth embodiment, the second error correction sequence is configured by clusters in each data zone. That is, a second error correction code cluster is generated from data clusters extracted one by one from each data zone other than the second error correction zone 1502, and the second error correction cluster is recorded in the second error correction zone 1502. Is done.

  Reference numerals 1504 to 1510 denote data clusters of the second error correction sequence, and reference numeral 1511 denotes a second error correction code cluster. The second error correction code cluster is generated from the clusters 1504 to 1510.

  The management areas 1503 and 1512 treat the area where the second error code correction cluster is recorded as an invalid area without registering the file at the address of the second error code correction zone 1502.

  In the optical disk of this embodiment, even in an apparatus that does not handle the second error correction code, data can be reproduced by the file system recorded on the optical disk.

  Note that the division of the optical disk of the present embodiment is not limited to eight equal parts.

  In addition, the management area of the present embodiment is not limited to being provided at the top and the bottom of the user data area of the optical disc.

  With the above configuration, in the tenth embodiment of the present invention, the clusters forming the second error correction sequence are discretely arranged, so that it is more resistant to burst errors than the first embodiment, and further improves data reliability. Can be increased.

  Furthermore, by excluding the mirrored management area from the second error correction sequence, data can be reproduced even in an apparatus that does not handle the second error correction code.

  The configuration and processing procedure of the apparatus of the eleventh embodiment are the same as those of the third embodiment, as in the sixth embodiment, and only the arrangement of data in the second error correction sequence is different. FIG. 16 shows the data arrangement of the eleventh embodiment.

  As in the tenth embodiment, the optical disc of this embodiment is divided into a plurality of data zones, and the second error correction sequence is formed from clusters of the respective data zones. However, unlike the tenth embodiment, the optical disk is divided into data zones having an address length a × b that divides the address length of the file system of the optical disk into ten equal parts. The file system management area is recorded at the head of the user data area of the optical disc.

  The last data zone 1602 of the user data area of the optical disc is a second error correction code zone.

  In the present embodiment, as in the sixth embodiment, a second error correction sequence is formed from clusters in each data zone. That is, a second error correction code cluster is generated from data clusters extracted one by one from each data zone other than the second error correction zone 1602 including the data in the management area 1603, and the second error correction code cluster is , Recorded in the second error correction code zone.

  Reference numerals 1604 to 1612 denote data clusters of the second error correction sequence in each data zone, and reference numeral 1613 denotes a second error correction code cluster. The second error correction code cluster 1613 is generated from the clusters 1604 to 1612.

  By adopting this embodiment, in the file system other than the file system capable of mirroring the management area as in the tenth embodiment, the error correction capability of the data including the management area is secured by the second error correction code. Is possible.

With the above configuration, in the eleventh embodiment of the present invention, the clusters forming the second error correction sequence are discretely arranged, so that it is more resistant to burst errors than the first embodiment, and further improves data reliability. Can be increased.
Furthermore, by including a management area that is not mirrored in the second error correction sequence, it is possible to improve the reliability of data including the management area that is not mirrored.

  The configuration and processing procedure of the apparatus of the twelfth embodiment are the same as those of the third embodiment, as in the tenth embodiment, and only the data arrangement of the second error correction sequence is different. FIG. 17 is a diagram showing the data arrangement of the twelfth embodiment.

  As in the tenth embodiment, the optical disc of this embodiment is divided into a plurality of data zones, and the second error correction sequence is formed from clusters of the respective data zones. Further, as in the tenth embodiment, the optical disk has a file system management area.

  Reference numerals 1703 and 1712 denote file system management areas arranged at the beginning and end of the user data area of the optical disc. The file system is, for example, UDF (Universal Disk Format).

  The management areas 1703 and 1712 mirror data, and the file system functions if either of the data exists.

  For the optical disk, the management areas 1703 and 1712 are excluded from the data zone of the address length a × b obtained by dividing the address length obtained by subtracting from the address length of the user data area of the optical disk by the address length of the management areas 1703 and 1712. The user data area is divided equally. The last data zone 1702 is a second error correction zone for recording the second error correction code cluster.

  In the present embodiment, as in the sixth embodiment, the second error correction sequence is configured by clusters in each data zone. That is, a second error correction code cluster is generated from data clusters extracted one by one from each data zone other than the second error correction zone 1702, and the second error correction cluster is recorded in the second error correction zone 1702. Is done.

  1704 to 1710 and 1724 to 1730 are data clusters of the second error correction series, and 1711 and 1731 are second error correction code clusters.

  Here, the second error correction code cluster is configured by using a plurality of clusters each having a data cluster extracted from each data zone as one unit. In this embodiment, the second error correction sequence recording end point Is considered to be less than that unit. FIG. 17 shows that recording is once completed in the data cluster 1724 of the second error correction series.

  The second error correction code cluster is generated from data clusters 1704 to 1710 and 1724 to 1730 of the second error correction sequence.

  User data is allocated to the data clusters 1704 to 1710 and 1724, and dummy data is allocated to the data clusters 1725 to 1730. That is, the dummy data is allocated so as to be an integral multiple of the data unit for forming the second error correction code cluster. In order to generate the second error correction code cluster 1731, a data cluster 1724 and data clusters 1725 to 1730 are used. Here, the dummy data may be, for example, fixed value data in which all bits are 0, fixed data in which all bits are 1, and the like. However, the present invention is not limited to these.

  The management areas 1703 and 1712 treat the area in which the second error code correction cluster is recorded as an invalid area without registering the file at the address of the second error code correction zone 1702.

  Furthermore, the management areas 1703 and 1712 treat user data assigned to the data clusters 1704 to 1710 and 1724 as one file, and treat data clusters 1725 to 1730 assigned dummy data as invalid areas. Here, as an invalid area, for example, a method of managing as a system file that is not a file created by a user, a method of managing as a recorded area instead of managing as a file, and the like can be considered.

  In the management areas 1703 and 1712, the data clusters 1704 to 1710 may be handled as one file, and the data cluster 1724 may be handled as another file.

  With the above configuration, in the twelfth embodiment of the present invention, not only the apparatus that does not handle the second error correction code, it is possible to reproduce data in units of files by the file system recorded on the optical disc, Data in file units can be deleted.

  Further, even in an apparatus that handles the second error correction code, it is possible to limit the second error correction code to the erasure target file when erasing data in units of files, so that the second error correction code of another file can be limited. Therefore, it is possible to improve the processing speed.

  Further, when an optical disk (recordable optical disk) that can be recorded only once is used as a recording medium, a new effect is exhibited. That is, when adding a file or deleting a file, there is no influence on the second error correction code of the other file data, so it is necessary to regenerate and rewrite the second error correction code of the other file data. In addition, since the second error code correction zone is not consumed, the capacity efficiency of the replacement area for rewriting is improved.

  The replacement area for rewriting is an area for recording data to be overwritten when performing pseudo-overwriting on an optical disk that can be recorded only once. The association between the overwritten data and the overwritten data can be realized, for example, by using a defect management function that lists and records the overwritten data and the address and area length of the overwritten data.

  Note that the division of the optical disk of the present embodiment is not limited to eight equal parts.

  In addition, the management area of the present embodiment is not limited to being provided at the top and the bottom of the user data area of the optical disc.

  Moreover, although the present Example demonstrated the case where the 2nd error correction code was handled, it is not restricted to this. In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card or an SD card.

  Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

DESCRIPTION OF SYMBOLS 1 ... Data recording / reproducing apparatus 2 ... Optical disk 3 ... Optical pick-up 4 ... Amplifier circuit 5 ... Signal processing circuit 6 ... Interface circuit 7 ... CPU
DESCRIPTION OF SYMBOLS 8 ... Servo circuit 21 ... Demodulation circuit 22 ... Deinterleave circuit 23 ... Memory 24 ... Error correction and error correction code addition circuit 25 ... Descramble circuit 26 ... Scramble circuit 27 ... Interleave circuit 28 ... Modulation circuit 29 ... Data copy circuit 1101 1201, 1310, 1401, 1501, 1601... Data zone 1102, 1202, 1311, 1402... Cluster 1213 ... Partition 1300-1308 ... Optical disk 1309 ... Error correction code disk 1503, 1512, 1603 ... Management area

Claims (8)

In a data recording apparatus for recording data on a recording medium,
Memory for storing input data;
Error correction code generation means for generating an error correction code for the data stored in the memory;
Recording means for recording the generated error correction code on the recording medium;
Control means for recording management data in a management area on the recording medium, and controlling to record user data in a user data area on the recording medium,
The error correction code generation means generates an error correction code in a predetermined unit for the input data to form an error correction code cluster;
When the recording unit divides the user data area of the recording medium into a plurality of zones, the recording unit records the error correction code cluster on the recording medium in a group of at least one of the plurality of zones. ,
A data recording apparatus for recording data so that the recording data sizes of the plurality of zones are equal. The data recording apparatus according to claim 1, wherein
The data recording apparatus, wherein the recording means adds and records dummy data so that the recording data sizes of the plurality of zones are equal. The data recording apparatus according to claim 2, wherein
The data recording apparatus characterized in that the recording means records the error correction code cluster in the user data area. The data recording apparatus according to claim 1, wherein
The data recording apparatus, wherein the recording data size of the plurality of zones is recorded so as to be an integral multiple of the predetermined unit. In the data recording device according to any one of claims 1 to 3,
The data recording apparatus, wherein the recording means records the data cluster of the predetermined unit for generating the error correction code cluster as one file data. In the data recording device according to any one of claims 1 to 3,
If the recording end point of the user data is less than the predetermined unit, the recording means generates the error correction code cluster and the data cluster of the predetermined unit and the predetermined unit or less. A data recording apparatus for recording so that the data cluster becomes one file data. In the data recording device according to any one of claims 1 to 6,
A data recording apparatus characterized in that, when a new file is additionally recorded, the error correction code recorded on the recording medium is not changed. In the data recording device according to any one of claims 1 to 6,
A data recording apparatus characterized in that when the recorded file is erased, the error correction code recorded on the recording medium is not changed.

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