JP2006048760A - Recording device and recording method, reproducing device and reproducing method, and recording/reproducing device and recording/reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording/reproducing device having larger possibility for reproducing new data to be updated than those of the conventional, even when the rewriting of an ECC block is interrupted in the middle, due to malfunction or the like. <P>SOLUTION: In recording the ECC block of management data on an optical disk 2, a memory controller 14 reads out all the 16 rows of PO parity inner codes from a memory 13 in which the ECC block is stored by an ECC encoding circuit 8, and records them on the optical disk 2 using a modulation circuit 9, a laser control circuit, and an optical pickup 4. The 192 rows of the inner codes of the respective data frames are then recorded in order. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording apparatus and a recording method for overwriting recording a digital signal on a recording medium. The present invention also relates to a reproducing apparatus and a reproducing method for reproducing a digital signal overwritten on a recording medium by the recording apparatus and the recording method. Furthermore, the present invention relates to a recording / reproducing apparatus and a recording / reproducing method for overwriting and recording a digital signal on a recording medium and reproducing the overwritten digital signal.

  A DVD (Digital Versatile Disc) has been developed as a storage medium for recording a digital video signal compressed using an image compression technique standardized by MPEG or the like. A DVD is an optical disc having the same diameter as a CD (compact disc), and the recording density is improved due to the progress of shortening the wavelength of laser light and the improvement of the digital modulation and error correction encoding processing as the NA of the objective lens increases. This is a further improvement. In DVD, even in the case of a single-layer disc, the data storage capacity is about 3.7 Gbytes. As a form of DVD, in addition to a read-only optical disc, a disc that can be recorded / reproduced by using an MO disc or a phase change optical disc is used. It has been proposed to use such a DVD as an external storage device of a computer.

  In a DVD, an error correction encoding process is performed in order to protect recorded data. Patent Document 1 filed by the applicant of the present application describes a data recording method and a reproducing method for such a DVD. This Patent Document 1 uses an LDC code in which a data read / write direction and an error correction encoding direction are different from each other as an error correction code, and adds a parity for detecting an error for each frame. With this parity, errors can be detected for each frame, and errors due to bit slips and the like can be dealt with. Also, by adding parity, the frame interval can be set to be the same even when the error correction method is different.

  Next, a DVD-RAM data format will be described as an example of the prior art. FIG. 9 shows a data frame of the DVD-RAM. For example, the main data for recording delivered from the host computer via the interface is divided every 2048 bytes, 6 bytes ID and 6 bytes RSV from the beginning, and 4 bytes EDC (error detective code) at the end. Is added to form a 2064-byte data frame shown in the figure.

  Among these, ID is a physical address with ECC parity, and RSV is an unused reserved area. EDC is a parity obtained by dividing RSV and main data from the MSB in bit order by an irreducible polynomial, and is an error detection code.

  In the DVD-ROM, it is necessary to refer to the ID for accessing the target sector. However, in the DVD-RAM, an address can be obtained from a pit pattern called CAPA previously formed on the disc. It is not always necessary to refer to it.

  The data frame configured as described above is arranged to form a matrix of a rows × b columns, for example, 12 rows × 172 columns on the memory for ECC encoding.

  FIG. 10 shows the configuration of the ECC block of the DVD-RAM. The ECC block is the smallest recording unit in the DVD-RAM and is configured based on 16 data frames. First, a total of c data frames from data frame 0 to data frame 15, here 16 data frames, are arranged in memory on a · c rows × b columns, for example, 192 rows × 172 columns, and the first in each column. Is added, and d bytes, for example, 16 bytes of PO parity is added. Of course, a, b, c, and d are natural numbers including the above numbers.

  The first encoding is a Reed-Solomon code RS (208, 192, 17) having a code length of 208 bytes and a parity number of 16 bytes, and is called an outer code. The obtained 16-byte × 172-column PO parity is arranged following the data frame 15 as shown in FIG.

  The 172 outer codes obtained as described above are then subjected to the second encoding in each row to add a 10-byte PI parity. The second encoding is a Reed-Solomon code RS (182, 172, 11) having a code length of 182 bytes and a parity number of 10 bytes, and is called an inner code. The obtained 208 rows × 10 bytes of PI parity is added after each row of the data frame as shown in FIG.

  FIG. 11 is a diagram in which a symbol B (j, i) is assigned for explanation for each byte of the ECC block 208 rows × 182 columns obtained as described above. However, j = 0 to 207 represents a row number, and i = 0 to 181 represents a column number. Each column B (0, i) to B (207, i) is an i-th outer code configured by adding a PO parity, and each row B (j, 0) to B (j, 181) is This is a j-th inner code configured by adding a PI parity.

  FIG. 12 shows the recording order of each byte B (j, i) when these ECC blocks are recorded on the disk. That is, for every 12 inner code lines of a data frame, one PO parity inner code is inserted to form a 13-line recording frame, and recording is performed so that the PO parity inner code is inserted at equal intervals. To go.

  FIG. 13 shows a flowchart of the recording order at this time. First, the value k of the recording frame counter is set to 0 in step S1. In step S2, the row counter value j is set to 0, and in step S3, the byte (column) counter value i is set to 0.

  Next, B (k * 12 + j, i) is recorded from step S4. Since k = 0 in step S1, j = 0 in step S2, and i = 0 in step S3, B (0, 0) is recorded in step S4.

  In step S5, the byte counter value i is incremented by +1. In step S6, it is checked whether or not the value i of the byte counter has reached 182. For this reason, step S4 to step S5 are repeated until it is determined in step S6 that i is 182 (i.e., i is 181). Thus, B (0,1), B (0,2), B (0,3)... B (0,171), B (0,172) following B (0,0). ... B (0,181) is recorded. Thereby, the inner code of the 0th row configured by adding the PI parity can be recorded.

  If it is determined in step S6 that the value i of the byte counter has reached 182, the recording of the inner code of the 0th row is terminated and the process proceeds to step S7. In step S7, the count value j of the row counter is incremented by +1. In step S8, it is checked whether or not the count value j of the row counter has become 12. For this reason, step S3 to step S7 are repeated until it is determined in step S8 that j is 12, that is, j is 11. Thus, following the inner code of the 0th row of the recording frame 0, the inner code of the 1st row {B (1, 0), B (1, 1), B (1, 2), B (1, 3)... B (1,171), B (1,172)... B (1,181)} to the inner code {B (11,0), B (11,1), B (11,2), B (11,3)... B (11,171), B (11,172)... B (11,181)} are recorded.

  If it is determined in step S8 that the count value j of the row counter has reached 12, the recording of the inner code of the eleventh row of recording frame 0 is terminated, and the process proceeds to step S9. In step S9, the count value i of the byte counter is set to zero.

  Next, B (192 + k, i) is recorded from step S10. Since the count value k of the recording frame counter remains k = 0 in step S1, B (192, 0) is recorded in step S10.

  In step S11, the count value i of the byte counter is incremented by +1. In step S12, it is checked whether or not the count value i of the byte counter has reached 182. For this reason, step S10 to step S11 are repeated until it is determined in step S12 that i is 182, that is, i is 181. Thus, following B (192, 0), B (192, 1), B (192, 2), B (192, 3)... B (192, 171), B (192, 172) ... B (192, 181) is recorded. B (192, 0) to B (192, 181) are PO parity inner codes. Therefore, up to this point (step S12), the recording frame 0 can be configured and recorded by inserting the PO parity inner code 1 row into the inner code 12 rows of the data frame 0.

  If it is determined in step S12 that the value i of the byte counter has reached 182, recording of the recording frame 0 is terminated and the process proceeds to step S13. In step S13, the count value k of the recording frame counter is incremented by +1. In step S14, it is checked whether or not the count value k of the recording frame counter has reached 16. For this reason, steps S2 to S13 are repeated until it is determined in step S14 that the count value k has reached 16, that is, k is 15. As a result, the recording frame 1 consisting of 13 rows in which one row of the PO parity inner code is inserted into 12 rows of the inner code of the data frame 1, and subsequently, the recording frame 2 to the recording frame 15 can be recorded.

  For example, when the count value k of the recording frame is set to 15 in step S13, B (180, 0) is recorded in step S4, and B (180, 181) is recorded through steps S5 and S6. In addition, B (191,0) to B (191,181) are recorded by returning from step S7 and step S8 to step S3 and repeating step S8 again. Then, the process proceeds from step S9 to step S14, and if it is determined that k = 16, the recording frame 15 consisting of 13 rows in which one row of the PO parity inner code is inserted into 12 rows of the inner code of the data frame 15 is recorded. Can do.

  The flowchart of the reproduction order is the same as shown in FIG. 14, and the demodulated data may be written at the position of B (j, i) on the memory. First, in step S21, the recording frame counter value k is set to zero. In step S22, the row counter value j is set to 0, and in step S23, the byte (column) counter value i is set to 0.

  Next, B (k * 12 + j, i) is reproduced from step S24. Since k = 0 in step S21, j = 0 in step S22, and i = 0 in step S23, B (0, 0) is reproduced in step S24.

  In step S25, the byte counter value i is incremented by +1. In step S26, it is checked whether or not the value i of the byte counter has reached 182. For this reason, step S24 to step S25 are repeated until it is determined in step S26 that i becomes 182, i.e., until i is 181. Thus, B (0,1), B (0,2), B (0,3)... B (0,171), B (0,172) following B (0,0). ... B (0,181) is reproduced. As a result, it is possible to reproduce the 0th row inner code configured by adding the PI parity.

  If it is determined in step S26 that the value i of the byte counter has reached 182, the reproduction of the inner code of the 0th row is terminated and the process proceeds to step S27. In step S27, the count value j of the row counter is incremented by +1. In step S28, it is checked whether or not the count value j of the row counter has become 12. For this reason, step S23 to step S27 are repeated until it is determined in step S28 that j has become 12, that is, j is 11. Thus, following the inner code of the 0th row of the recording frame 0, the inner code of the 1st row {B (1, 0), B (1, 1), B (1, 2), B (1, 3)... B (1,171), B (1,172)... B (1,181)} to the inner code {B (11,0), B (11,1), B (11,2), B (11,3)... B (11,171), B (11,172)... B (11,181)} are reproduced.

  If it is determined in step S28 that the count value j of the row counter has reached 12, the recording of the inner code of the eleventh row of recording frame 0 is terminated, and the process proceeds to step S29. In step S29, the count value i of the byte counter is set to zero.

  Next, B (192 + k, i) is reproduced from step S30. Since the count value k of the recording frame counter remains k = 0 in step S21, B (192, 0) is reproduced in step S30.

  In step S31, the count value i of the byte counter is incremented by +1. In step S32, it is checked whether or not the count value i of the byte counter has reached 182. For this reason, step S30 to step S31 are repeated until it is determined in step S32 that i becomes 182, that is, until i is 181. Thus, following B (192, 0), B (192, 1), B (192, 2), B (192, 3)... B (192, 171), B (192, 172) ... B (192, 181) is reproduced. B (192, 0) to B (192, 181) are PO parity inner codes. Therefore, so far (step S12), it is possible to reproduce the recording frame 0 configured by inserting one row of PO parity inner code into 12 rows of data code 0 inner code.

  If it is determined in step S32 that the byte counter value i has reached 182, playback of the recording frame 0 is terminated, and the process proceeds to step S33. In step S33, the count value k of the recording frame counter is incremented by +1. In step S34, it is checked whether or not the count value k of the recording frame counter has reached 16. Therefore, steps S22 to S33 are repeated until it is determined in step S34 that the count value k has reached 16, that is, k is 15. As a result, the recording frame 1 consisting of 13 rows obtained by inserting one row of the PO parity inner code into the 12 inner code rows of the data frame 1, and subsequently the recording frame 2 to the recording frame 15 can be reproduced.

  For example, when the count value k of the recording frame is set to 15 in step S33, B (180, 0) is reproduced in step S24, and B (180, 181) is reproduced through steps S25 and S26. Further, B (191,0) to B (191,181) are reproduced by returning from step S27 and step S28 to step S23 and repeating step S28 again. Then, the process proceeds from step S29 to step S34, and if it is determined that k = 16, the recording frame 15 consisting of 13 rows in which one row of the PO parity inner code is inserted into 12 rows of the inner code of the data frame 15 can be reproduced. it can.

JP 08-339636 A

By the way, when building a file system on a disk and recording / deleting a file, the ECC block in which management data such as volume management information (eg, FAT: File Allocation Table) and directory is recorded has the following characteristics. There is.
(1) In many cases, only a part of the previously recorded data is updated and rewritten.
(2) The number of rewrites for the same ECC block is large.
(3) Information on a large number of files is recorded, and if data is lost, the damage is great.

  The results of recording / deleting files are reflected in the file system for the first time by updating the volume management information and management data such as directories. Therefore, in most cases when a disk failure occurs due to a device failure Occurs when updating volume management information and management data such as directories. That is, the ECC block of the management data in which only a part of the data is updated and rewritten is fragile and the damage when it is broken is great.

  An example of an ECC block of management data in which a part of the data is updated is shown in FIG. FIG. 15 shows a case where the contents of the first six lines of the data frame 13 are updated. As a result of updating the value of the data frame 13, all the PO parities are recalculated and become different values from those before the update (however, in some rare cases, there will be a byte having the same value). Further, the PI parity for the updated 6-row data in the first half of the data frame 13 and the PI parity for the recalculated PO parity also change. In FIG. 15, the region where the value has changed is indicated by diagonal lines.

  As can be seen from FIG. 15, when a part of the data is updated and rewritten, the number of bytes whose value changes in the parity may be larger than in the updated data.

When the ECC block of FIG. 15 updated as described above is recorded on the disc, if the recording apparatus is broken during recording and the recording is stopped, the processing for reproducing the ECC block is based on the following points. explain.
(I) Recording is performed by the overwrite method, and it is assumed that the signal recorded up to the time of failure is based on the updated data, and thereafter, the recording signal based on the data before the update remains.
(II) It is assumed that the quality of both the new and old recording signals is good and that all errors included in the inner code at the time of reproduction can be corrected using the PI parity.
(III) In the error correction process of the outer code, an error of 8 bytes or less can be corrected, and an error exceeding 8 bytes cannot be corrected.

  FIG. 16 shows data when recording is stopped due to a failure when the ECC block of FIG. The range of 48 lines in total from data frame 0 to data frame 3 indicated by the downward arrow is a newly overwritten area, and the other areas are areas of old data that were not overwritten by a failure. Indicates that there is.

  In A (left figure), an area where the value has changed when viewed from the ECC block before the update is indicated by hatching. The changed data in each column, that is, each outer code is 4 bytes, and these can be corrected to old data by error correction processing.

  In B (right figure), when the ECC block to be updated is viewed as a reference, an area where the old value remains is indicated by hatching. The old value data included in each outer code is 18 bytes, which exceeds the correction ability of the outer code. That is, it cannot be corrected to new data.

  Therefore, when the ECC block of FIG. 16 is reproduced, old data before update is obtained.

  FIG. 17 shows data when recording is stopped due to a failure when 3/4, that is, 156 rows of the ECC block of FIG. 15 is recorded. The range of 144 rows in total from the data frame 0 to the data frame 11 indicated by the downward arrow is a newly overwritten region, and the other range is an old data region that has not been overwritten due to a failure. Indicates that there is.

  In A (left figure), an area where the value has changed when viewed from the ECC block before the update is indicated by hatching. The data changed in each column, that is, each outer code is 12 bytes, which exceeds the correction ability of the outer code. That is, it cannot be corrected to old data.

  In B (right figure), when the ECC block to be updated is viewed as a reference, an area where the old value remains is indicated by hatching. The old value data included in each outer code is 10 bytes, which exceeds the correction ability of the outer code. That is, it cannot be corrected to new data.

  Therefore, in the case of FIG. 17, it is not possible to correct the error in both new and old data.

  Here, as far as A is seen, it is only the PO parity part that cannot be corrected, and it seems that the old data can be reproduced in all the data frames. For example, when a burst error that cannot be corrected by the inner code occurs, the correction becomes impossible.

  In the present invention, when only a part of the ECC block is updated and rewritten, even when the rewriting of the ECC block is interrupted due to a failure or the like, there is a possibility that new data to be updated can be reproduced. An object is to provide a large recording apparatus and recording method, a reproducing apparatus and a reproducing method, and a recording and reproducing apparatus and a recording and reproducing method.

  In order to solve the above problems, a recording apparatus according to the present invention is a recording apparatus for overwriting recording a digital signal on a recording medium. In the recording apparatus, a data frame in which the digital signal is collected so as to form an a row × b column matrix is provided. Error correction coding arranged in a plurality of c, a × c rows × b columns in the storage unit, and performing coding processing on at least each column to convert it into an error correction code with d-byte correction parity added in the column direction Among the error correction codes stored for each block unit in the storage unit, for the block of the error correction code related to the management data, the correction parity part in the column direction is read first, and then the main data part is read. A block of error correction codes relating to management data read by the storage control means and the storage control means are recorded on the recording medium in the reading order. Recording means for recording.

  In this recording apparatus, for the code block of management data, the parity part in the column direction is first recorded on the recording medium, for example, all c rows, and then the code of each data frame is sequentially recorded. The influence of updating is greatly reflected in the parity part in the column direction. For this reason, even when block rewriting is interrupted due to a failure or the like, the new data to be updated can be reproduced by performing error correction processing on the old and new data remaining on the recording medium.

  In order to solve the above-described problems, the recording method according to the present invention is a recording method for overwriting a digital signal on a recording medium. In the recording method, data obtained by collecting the digital signal so as to form an a row × b column matrix. An error correction that arranges a plurality of frames in a storage unit in c, a × c rows × b columns, converts at least each column into an error correction code with d-byte correction parity added in the column direction. Among the error correction codes stored in the storage unit for each block in the encoding step, for the block of the error correction code related to the management data, the correction parity part in the column direction is read first, followed by the main data part The storage unit control step to be read and the block of error correction codes relating to the management data read by the storage unit control step to the recording medium in the reading order And a recording process for recording on the body.

  According to this recording method, for the code block of the management data, the parity part in the column direction is first recorded on, for example, all c rows on the recording medium, and then the code of each data frame is sequentially recorded. The influence of updating is greatly reflected in the parity part in the column direction. For this reason, even when block rewriting is interrupted due to a failure or the like, the new data to be updated can be reproduced by performing error correction processing on the old and new data remaining on the recording medium.

  In order to solve the above-described problem, a reproducing apparatus according to the present invention uses a recording apparatus that overwrite-records a digital signal on a recording medium to collect a data frame in which the digital signal is combined so as to form an a row × b column matrix. A plurality of c, a × c rows × b columns in the storage unit, and at least each column is encoded and converted into an error correction code to which d-byte correction parity in the column direction is added, and the storage unit Among the error correction codes stored for each block, for the block of the error correction code related to the management data, the correction parity part in the column direction is read first, then the main data part is read, and the read management A playback apparatus for playing back recorded data recorded on the recording medium with the block of error correction codes relating to data in the reading order, Of the recorded management data, a d-byte correction parity portion in the column direction and error correction means for performing error correction processing on the data portion are provided, and the recording device performs an error correction block recording operation on the management data. When the recording is interrupted in the middle, both the data in the first half of the recording stop point and the data in the latter half of the recording stop point are taken into the error correction means and subjected to error correction processing.

  According to this playback device, even if block rewriting is interrupted due to a failure or the like, new data that was to be updated by applying error correction processing to the old and new data remaining on the recording medium Can be reproduced.

  In order to solve the above problems, a reproducing method according to the present invention uses a recording apparatus that overwrites and records a digital signal on a recording medium to collect a data frame in which the digital signal is collected in a matrix of a rows and b columns. A plurality of c, a × c rows × b columns in the storage unit, and at least each column is encoded and converted into an error correction code to which d-byte correction parity in the column direction is added, and the storage unit Among the error correction codes stored for each block, for the block of the error correction code related to the management data, the correction parity part in the column direction is read first, then the main data part is read, and the read management A reproduction method for reproducing recorded data recorded on the recording medium with the error correction code block relating to data being in the reading order, wherein the recording Of the management data recorded on the medium, a d-byte correction parity portion in the column direction, and an error correction step for performing error correction processing on the data portion, and recording of error correction blocks related to the management data in the recording device When the operation is stopped halfway, both the first half data of the recording stop point and the second half data after the recording stop point are taken into the error correction step and subjected to error correction processing.

  According to this playback method, even if block rewriting is interrupted due to a failure or the like, new data that was to be updated by applying error correction processing to the old and new data remaining on the recording medium. Can be reproduced.

  In order to solve the above problems, a recording / reproducing apparatus according to the present invention overwrites a digital signal on a recording medium and reproduces the overwritten digital signal. A plurality of c data frames arranged in a matrix of b columns are arranged in a storage unit in a number of c, a × c rows × b columns, and at least each column is subjected to an encoding process to correct d bytes of parity in the column direction. Error correction coding means for converting to an error correction code to which is added, and among the error correction codes stored in the storage unit for each block unit, for the block of the error correction code related to management data, the correction parity unit in the column direction Storage unit control means for reading out the main data portion first, and the management data read by the storage unit control means. Recording means for recording the block of the correction code on the recording medium in the reading order, reading means for reading the management data recorded on the recording medium, and management data read from the recording medium by the reading means A d-byte correction parity portion in the column direction, and error correction means for performing error correction processing on the data portion, and the recording operation of the error correction block relating to the management data in the recording device is interrupted in the middle. In this case, both the first half of the data at the recording stop point and the second half of the data at the recording stop point are taken into the error correction means and subjected to error correction processing, and the error correction processing is performed by the error correction means. The management data is written to the storage unit based on the control of the storage unit control means, and the management data on the storage unit is partially updated before the Out of the management data encoded according to the control of the storage unit control unit, the correction parity unit is read first, the main data unit is subsequently read out, and the recording unit Record on the recording medium.

  According to this recording / reproducing apparatus, for the code block of the management data, the parity part in the column direction is first recorded on, for example, all the c rows on the recording medium, and then the code of each data frame is sequentially recorded. The influence of updating is greatly reflected in the parity part in the column direction. For this reason, even when block rewriting is interrupted due to a failure, etc., by applying error correction processing to the old and new data remaining on the recording medium, it is possible to reproduce the new data that was being updated, Furthermore, the reproduced data can be recorded on a recording medium.

  In order to solve the above problems, a recording / reproducing method according to the present invention overwrites a digital signal on a recording medium and reproduces the overwritten digital signal. A plurality of data frames arranged so as to form a matrix of rows × b columns are arranged in the storage unit in a plurality of c and a × c rows × b columns, and at least each column is subjected to encoding processing to be d bytes in the column direction. Among the error correction codes that are converted into error correction codes to which correction parity is added and the error correction codes that are stored in the storage unit for each block unit, the error correction code blocks related to management data are corrected in the column direction. The storage unit control step for reading out the parity portion first, followed by the main data portion, and the management data read out by the storage unit control step. A recording step of recording the block of error correction codes to be recorded on the recording medium in the reading order, a reading step of reading management data recorded on the recording medium, and a management read from the recording medium by the reading step A d-byte correction parity portion in the column direction of the data, and an error correction step for performing error correction processing on the data portion, and the recording operation of the error correction block relating to the management data in the recording device is stopped halfway In this case, both the data in the first half of the recording stop point and the data in the latter half of the recording stop point are taken into the error correction process and subjected to error correction, and the error correction process is performed in the error correction process. The management data is written to the storage unit based on the control of the storage unit control step, and the management data on the storage unit is partially updated. Of the management data that is input to the error correction encoding step and is encoded based on the control of the storage unit control step, the correction parity portion is read first, followed by the main data portion, and the recording step To record on the recording medium.

  According to this recording / reproducing method, for the code block of the management data, the parity part in the column direction is first recorded on, for example, all the c rows on the recording medium, and then the code of each data frame is sequentially recorded. The influence of updating is greatly reflected in the parity part in the column direction. For this reason, even when block rewriting is interrupted due to a failure, etc., by applying error correction processing to the old and new data remaining on the recording medium, it is possible to reproduce the new data that was being updated, Furthermore, the reproduced data can be recorded on a recording medium.

  According to the present invention, when a failure occurs during the recording of management data to the disc, the possibility that the latest management data can be recovered is higher than in the prior art even if the recording is stopped halfway.

  Therefore, the possibility that the managed file data is lost can be suppressed, and a more reliable data recording system can be realized.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an optical disc recording / reproducing apparatus to which the present invention can be applied. This optical disc recording / reproducing apparatus 1 is used as an external storage device of a host computer 60 connected via a bus 50, and is used for a phase change optical disc 2 which is a kind of rewritable disc, such as a DVD-RAM. Record / play information signals.

  This optical disk recording / reproducing apparatus 1 is a specific example of a recording apparatus that overwrite-records a digital signal on a recording medium composed of an optical disk 2 such as a DVD-RAM. A plurality of c, for example, 16 a × c rows × b columns of data frames in which the digital signals are collected in a matrix of a rows × b columns, for example, 12 rows × 172 columns, are stored in the storage unit (memory 13). For example, an ECC encoding circuit 8 that is arranged in 12 · 16 rows × 172 columns and performs an encoding process on at least each column to convert it into an error correction code with a correction parity of 16 bytes in the column direction, for example, 16 bytes. Of the error correction codes stored in the memory 13 for each ECC block, for the ECC block of the error correction code related to the management data, the column-direction correction parity part (PO parity) is read first, followed by the main data part. Read out the ECC block of the error correction code relating to the management data read out by the memory controller 14. And a recording means comprises an optical pickup 4 for recording leave the optical disc 2 ranking out. The optical disc recording / reproducing apparatus 1 also performs ECC to perform error correction processing on the 16-byte correction parity portion in the column direction and the data portion of the management data read from the optical disc 2 by the optical pickup 4 that is also a reading means. And an error correction circuit 12. The a, b, c, and d are natural numbers including the above numerical values. That is, the above 12 rows × 172 columns, 16 parities and the like are merely examples, and the data frame configuration and matrix can be configured in various sizes from combinations of natural numbers.

  The overall configuration of the optical disc recording / reproducing apparatus 1 will be described. As shown in FIG. 1, an optical disc recording / reproducing apparatus 1 is configured to rotate a phase change type optical disc 2 according to control of a servo circuit 6 described later, and a signal recording surface of the optical disc 2 to be rotated. An optical pickup 4 is provided as an optical system that records a signal by irradiating a light beam according to control of the servo circuit 6 and reads out a recording signal by returning light from the signal recording surface.

  Further, the optical disc recording / reproducing apparatus 1 is based on a thread motor 5 for moving the optical pickup 4 in the radial direction of the disc based on the control of the servo circuit 6 and various error signals supplied from an RF amplifier 10 described later. A spindle motor 3, an optical pickup 4 and a servo circuit 6 for controlling the thread motor 5.

  Further, the optical disc recording / reproducing apparatus 1 includes an ECC encoding circuit 8 that adds an error correction code by Reed-Solomon product code to recording data sent from the host computer 60 via the bus 50 and an I / F 7 described later. For example, a modulation circuit 9 for modulating the recording data to which the error correction code is added by the ECC encoding circuit 8 is, for example, 8/16.

  The optical disk recording / reproducing apparatus 1 also includes an RF amplifier 10 that obtains a reproduction RF signal, a focus error signal, and a tracking error signal from a signal read from the optical disk 2 by the optical pickup 4, and a binary value from the reproduction RF signal of the RF amplifier 10. A demodulation circuit 11 for demodulating the reproduction data obtained by the conversion, and an ECC error correction circuit 12 for performing an error correction process on the reproduction data demodulated by the demodulation circuit 11 using a Reed-Solomon product code and outputting the reproduction data.

  The optical disc recording / reproducing apparatus 1 also controls communication between the memory 13 used for error correction code addition processing by the ECC encoding circuit 8 and error correction processing by the ECC error correction circuit 12 and the host computer 60 via the bus. I / F7.

  The optical disc recording / reproducing apparatus 1 decodes commands supplied from the host computer 60 via the bus 50 and the memory controller 14 for controlling the write / read timing and address at the time of data recording / reproduction to / from the memory 13. Then, the system controller 16 for system controlling each part to be commanded, and the recording area designation address of the data obtained by the system controller 16 decoding the command from the host computer 60 are discriminated, and the discrimination result is sent to the memory controller 14. And an address discrimination unit 15 to be supplied.

  The phase change type optical disc 2 employs a system that uses a reversible change between a crystalline state and an amorphous state of a recording material by a light beam. The recording material is heated to a melting point or higher by a high-power light beam, and then rapidly cooled to form an amorphous state (recording), and the amorphous state is irradiated with a medium-power light beam to exceed the crystallization temperature. Is heated to form a crystallized state (erase). The difference in reflectance due to the difference in optical constant between the amorphous and crystalline crystals becomes a signal. Thus, the above-described DVD-RAM of the phase change method, for example, can be overwritten (information signal overwriting) by power modulation of a single light beam. In addition, a failure may occur during recording of the ECC block. Also, files are managed by rewriting the same cluster many times.

  The optical pickup 4 is close to and opposed to the optical disk 2 and irradiates the signal recording surface of the optical disk with the high power light beam or medium power light beam from the laser diode LD. In addition to the laser diode LD, the optical pickup 4 includes a polarization beam splitter, an objective lens, a photodetector that detects reflected light from the optical disk, a biaxial actuator that drives the objective lens, and a light amount detector that detects the amount of light emitted from the laser diode. Is provided. The optical pickup 4 is attached with a thread mechanism that is driven by a thread motor 5 to move the optical pickup 4 in the radial direction of the optical disc 2.

  Next, the overall operation of the optical disc recording / reproducing apparatus 1 will be described. When recording or reproducing information signals to or from the optical disk recording / reproducing apparatus 1 by a command from the host computer 60, the optical pickup 4 is seek-operated by the thread motor 5 from the host computer 60 to the target track position on the optical disk 2. After the positioning, the servo circuit 6 drives the tracking coil and the focus coil of the biaxial actuator to finely adjust the tracking and focus to match the target value.

  At the time of recording, the laser power is erased by a laser control circuit (not shown) and the information of the part not recorded is erased, and the information signal is recorded at the target track position by adjusting the laser power to the write power level. During reproduction, the laser control circuit adjusts the laser power to the read power level to reproduce the information signal recorded at the target track position.

  In the system control system by the system controller 16, first, the system control circuit 16 supplies a command for rotating the spindle motor 3 to the servo circuit 6 based on the host computer 60. In response to this command, the servo circuit 6 supplies a drive signal to the spindle motor 3 to rotate the spindle motor 3. A servo signal synchronously detected from the demodulation circuit 11 based on the reproduction RF signal is supplied to the servo circuit 6.

  Next, based on the host computer 60, the system control circuit 19 supplies the servo circuit 6 with a command of a coarse feed command by the thread motor 5. The optical pickup 4 reads an information signal at the current position from the optical disc 2 and supplies an RF signal and various calculation signals to the RF amplifier 10 via a built-in photodiode and various calculation units. The RF amplifier 10 generates a tracking error signal from various calculation signals and supplies the tracking error signal to the servo circuit 6. The servo circuit 6 generates a drive signal based on the tracking error signal and supplies the drive signal to the sled motor 5. Based on the drive signal, the sled motor 5 causes the optical pickup 4 to perform a coarse seek operation via a coarse feed mechanism (not shown).

  The operation of the seek / servo system consists of a thread motor system and a biaxial actuator system in the optical pickup 4. In the sled motor system, the optical pickup 4 is roughly seek-operated by the sled motor 5, and the position is detected by an encoder (not shown). The actuator system causes the optical pickup 4 to perform a fine seek operation by a biaxial actuator using a tracking coil (not shown).

  The RF amplifier 10 detects a focus error signal from the information signal and supplies it to the servo circuit 6. The servo circuit 6 focuses the optical pickup 4 with a focus coil of a biaxial actuator (not shown) based on the focus error signal.

  The optical disc recording / reproducing apparatus 1 performs the recording or reproducing operation as follows after positioning the optical pickup 4 at the target track position. At the time of reproduction, the system controller 16 supplies a reproduction command to a laser control circuit (not shown). The laser control circuit adjusts the laser emission power to the reproduction power level and supplies it to the laser diode LD of the optical pickup 4. The laser diode LD irradiates the optical disc 2 with laser light through the objective lens. The photodiode receives the laser beam reflected by the optical disc 2 on, for example, a two-divided surface. The photodiode converts the received two-divided laser beam into an electrical signal and generates a reproduction RF signal by various arithmetic units.

  The reproduction RF signal is supplied to the RF amplifier 10. The RF amplifier 10 amplifies the reproduction data at a high frequency and supplies it to the demodulation circuit 11. The demodulating circuit 11 demodulates the reproduced data by 8/16 using, for example, EFM-plus. The demodulation circuit 11 supplies the demodulated reproduction data to the ECC error correction circuit 12. The ECC error correction circuit 12 performs error correction processing on the reproduction data using a Reed-Solomon product code and outputs the reproduction data. The decoded information signal is communication-controlled by the I / F 7 and supplied to the host computer 60 via the bus 50.

  At the time of recording, the system controller 16 supplies a recording command to the laser control circuit. The recording data supplied from the host computer 60 is supplied to the ECC encoding circuit 8. The ECC encoding circuit 8 adds an error correction code to the recording data using a Reed-Solomon product code. The ECC encoding circuit 8 supplies the recording data with the error correction code added to the modulation circuit 9. The modulation circuit 9 performs 8/16 modulation on the recording data to which the error correction code is added, for example, by EFM-plus. The modulation circuit 9 supplies the modulated recording data to a PWM driver (not shown) of the laser control circuit. The PWM driver performs pulse width modulation on 8 / 16-modulated recording data based on the recording command, and supplies a laser light emission signal of a write power level to the laser diode LD. The laser diode LD irradiates the optical disc 2 with laser light through an objective lens in the optical pickup 4. The recording data is recorded at the target track position in a state where the recording thin film of the optical disk 2 is heated to an amorphous state by laser light.

  By the way, the optical disc recording / reproducing apparatus 1 includes not only normal data (hereinafter referred to as file data) sent from the host computer 60 but also a directory for recording file names, volume management information for managing disc capacity, and the like. Management data is also recorded on the optical disc 2. Such a directory and volume management information (for example, FAT) are also recorded on the optical disc 2 in units of ECC blocks.

  The ECC block formation of DVD-RAM has already been described in the background art. This is processing performed by the ECC encoding circuit 8 in FIG. The ECC encoding circuit 8 arranges a total of 16 data frames from the data frame 0 to the data frame 15 on the memory 13 under the control of the memory controller 14 in 192 rows × 172 columns, and each column includes the first data frame. Encoding is performed and a 16-byte PO parity is added. The first encoding is a Reed-Solomon code RS (208, 192, 17) having a code length of 208 bytes and a parity number of 16 bytes, and is called an outer code. The obtained 16-byte × 172-column PO parity is arranged subsequent to the data frame 15. The ECC encoding circuit 8 subsequently applies the second encoding to each row for the 172 outer codes, and adds a 10-byte PI parity. The second encoding is a Reed-Solomon code RS (182, 172, 11) having a code length of 182 bytes and a parity number of 10 bytes, and is called an inner code. The obtained 208 rows × 10 bytes of PI parity is added after each row of the data frame.

  In the background art, with reference to FIG. 9, the symbol B (j, i) is assigned to each byte of the ECC block 208 rows × 182 columns. Here, the description is omitted.

By the way, as described in the problem to be solved by the invention, when a file system is constructed on the optical disc 2 and file recording / deletion is performed, volume management information (eg, FAT: File Allocation Table) and directories are recorded. The ECC block had the following characteristics.
(1) In many cases, only a part of the previously recorded data is updated and rewritten.
(2) The number of rewrites for the same ECC block is large.
(3) Information on a large number of files is recorded, and if data is lost, the damage is great.

  The results of recording / deleting files are reflected in the file system for the first time when the volume management information and directory are updated. Therefore, in most cases where a disk failure occurs due to a device failure, these volume management information and Occurs when updating a directory.

  That is, an ECC block in which only a part of data is updated and rewritten is fragile, and damage caused when it is broken is large.

  Therefore, the optical disc recording / reproducing apparatus 1 records the ECC block of the management data such as the directory and volume management information on the optical disc 2 as shown in FIG. FIG. 2 is a diagram showing a recording order of each byte B (j, i) when an ECC block is recorded on a disk according to the present invention.

  When recording the ECC block of the directory or volume management information on the optical disc 2 from the host computer 60, a recording area designation address such as a directory address is sent to the system controller 16. When determining the recording area designation address, the address determination unit 15 sends the determination result to the memory controller 14.

  Based on the determination result, the memory controller 14 knows that the ECC encoding circuit 8 has made the ECC block into management data such as the directory and volume management information. Then, the memory controller 14 first reads all 16 rows of the PO parity inner code from the memory 13 in which the ECC encoding circuit 8 stores the ECC block, and uses the modulation circuit 9, the laser control circuit, and the optical pickup 4. Recording on the optical disc 2. Subsequently, the inner code 192 lines of each data frame are recorded in order. The interval between the IDs at the head of each data frame is every 12 lines, and the positional relationship with the recording frame is lost. However, this is not a problem with a disc such as a DVD-RAM in which addresses are engraved in advance.

FIG. 3 is a flowchart for realizing the recording order when the ECC block of the management data such as the directory and volume management information is read from the memory 13 by the memory controller 14 and recorded on the optical disc 2.
First, the memory controller 14 sets the count value j of the row counter to 192 in step S41. In step S42, the byte counter value i is set to zero.

  Next, in step S43, B (j, i) is read from the memory 13 and recorded on the optical disc 2 using the modulation circuit 9, the laser control circuit, and the optical pickup 4 as described above. Since j = 192 in step S41 and i = 0 in step S42, B (192, 0) is recorded first in step S43.

  In step S44, the byte counter value i is incremented by +1. In step S45, it is checked whether or not the value i of the byte counter has reached 182. For this reason, step S43 to step S44 are repeated until it is determined in step S45 that i becomes 182, that is, until i is 181. Thus, following B (192, 0), B (192, 1), B (192, 2), B (192, 3)... B (192, 171), B (192, 172) ... B (192, 181) can be recorded as the inner code of the PO parity of the 0th row.

  If it is determined in step S45 that the value i of the byte counter has reached 182, the recording of the inner code of the PO parity in the 0th row is terminated, and the process proceeds to step S46. In step S46, the count value j of the row counter is incremented by +1. In step S47, it is checked whether or not the count value j of the row counter has become 208. Therefore, steps S42 to S46 are repeated until it is determined in step S47 that j is 208, that is, j is 207. Thus, the PO parity inner code of the first row {B (193,0), B (193,1), B (193,2), B ( 193, 3)... B (193, 171), B (193, 172)... B (193, 181)} to the 16th row PO parity inner code {B (207, 0), B ( 207,1), B (207,2), B (207,3)... B (207,171), B (207,172)... B (207,181)} are recorded.

  Among these, from the inner code B (192, 0) to B (192, 181) of the PO parity in the 0th row to the inner code B (204, 0) to B (204, 181) of the PO parity in the 12th row. 13 constitutes recording frame 0.

  Also, from the 14th row PO parity inner codes B (205,0) to B (205,181) to the 16th row PO parity inner codes B (207,0) to B (207,181). Three lines are added to the 10th line from the inner code of the 0th line, which is configured by adding a PI parity, which will be described later, to the inner code of the 9th line, so that it comes before the 10th line, and recording. Frame 1 is configured.

  3 from the 14th row PO parity inner codes B (205,0) to B (205,181) to the 16th row PO parity inner codes B (207,0) to B (207,181). In order to record the inner code of the 0th and subsequent rows configured by adding the PI parity after the row, the processing from step S48 in FIG. 3 is performed.

  In step S48, the count value j of the row counter is set to zero. In step S49, the count value i of the byte count is set to zero.

  Next, B (j, i) is recorded from step S50. Since j = 0 in step S8 and i = 0 in step S9, B (0, 0) is recorded in step S50.

  In step S51, the byte counter value i is incremented by +1. In step S52, it is checked whether or not the value i of the byte counter has reached 182. For this reason, step S50 to step S51 are repeated until it is determined in step S52 that i is 182 (i.e., i is 181). Thus, B (0,1), B (0,2), B (0,3)... B (0,171), B (0,172) following B (0,0). ... B (0,181) is recorded. Thereby, the inner code of the 0th row configured by adding the PI parity can be recorded.

  If it is determined in step S52 that the value i of the byte counter has reached 182, the recording of the inner code of the 0th row is terminated and the process proceeds to step S53. In step S53, the count value j of the row counter is incremented by +1. In step S54, it is checked whether or not the count value j of the row counter has reached 192. For this reason, step S9 to step S53 are repeated until it is determined in step S54 that j is 192, that is, j is 191. As a result, the inner code of the first row {B (1, 0), B (1, 1), B (1, 2), B (1, 3),. B (1,171), B (1,172)... B (1,181)} to the inner code {B (191,0), B (191,1), B (191, 2), B (191, 3)... B (191, 171), B (191, 172)... B (191, 181)} are recorded.

  The 9 rows from the inner code B (0,0) to B (0,181) of the 0th row to the inner code B (9,0) to B (9,181) of the 9th row are as described above. 3 from PO parity inner codes B (205,0) to B (205,181) in the 14th row to PO parity inner codes B (207,0) to B (207,181) in the 16th row. Along with the line, recording frame 1 was constructed.

  A total of 182 lines of inner codes from the 10th line of the inner code to the 191st line of the inner code are collected into 13 lines and used to form the recording frame 2 to the recording frame 15.

  As described above with reference to the recording procedure of FIG. 3, when recording the directory and volume management information, the optical disk recording / reproducing apparatus 1 reads all 16 rows of the PO parity inner code of the ECC block to read the optical disk 2. To record. Subsequently, the inner code 192 lines of each data frame are recorded in order. Here, it is not necessary to control the counter for each recording frame, and only the PO parity and the data frame are recorded in this order. That is, the error correction parity part is recorded first, followed by the main data part of the directory and volume management information.

  In the following, when a part of the ECC block of the management data including the directory and volume management information is updated and rewritten, if the optical disc recording / reproducing apparatus 1 fails during recording on the optical disc 2, the recording is stopped. A process for reproducing the ECC block will be described.

Here, as described in the background art, the following points are assumed.
(I) Recording is performed by the overwrite method, and it is assumed that the signal recorded up to the time of failure is based on the updated data, and thereafter, the recording signal based on the data before the update remains.
(II) It is assumed that the quality of both the new and old recording signals is good and that all errors included in the inner code at the time of reproduction can be corrected using the PI parity.
(III) In the error correction process of the outer code, an error of 8 bytes or less can be corrected, and an error exceeding 8 bytes cannot be corrected.

  The operation of the optical disc recording / reproducing apparatus 1 in this case is as follows. That is, the optical disc recording / reproducing apparatus 1 demodulates the PO parity portion of the management data recorded on the optical disc 2 through the optical pickup 4, the RF amplifier 10, and the demodulation circuit 11 and inputs the demodulated data to the ECC error correction circuit 12. Next, the optical disc recording / reproducing apparatus 1 demodulates the main data portion of the management data recorded on the optical disc 2 via the optical pickup 4, the RF amplifier 10, and the demodulation circuit 11, and inputs it to the ECC error correction circuit 12. . Next, the optical disc recording / reproducing apparatus 1 uses the memory controller 14 to write management data that has been error-corrected by the ECC error correction circuit 12 to the memory 13. Based on the command from the host computer 60, the system controller 16 partially updates the management data on the system memory 13 by adding a file name, for example. Next, management data on the memory 13 is read using the memory controller 14 and input to the ECC encoding circuit 8. The ECC encoding circuit 8 converts the management data read from the memory 13 into an ECC block. Then, the memory controller 14 is used and the recording procedure of FIG. 3 is followed. As shown in FIG. 2, the PO parity part of the encoded management data is recorded on the optical disk 2 and the data part is subsequently recorded on the optical disk. Record in 2. In this way, when a cluster whose recording has been stopped is reproduced, new parity and new data are recorded in the first half of the stop point, and old data is recorded in the second half.

  At this time, if the sum of the number of data lost due to the discontinuity of the recording signal and the number of data updated with respect to the old data is within the correction capability range of the error correction code near the stop point, these The correction processing is performed as if the portion of FIG. 4 is a data error caused by dust or noise, and as a result, updated new data is reproduced.

  FIG. 4 shows data in the case where recording is stopped due to a failure when the ECC block of FIG. The range of 36 rows from the data frame 0 to the data frame 2 indicated by the downward arrow is a newly overwritten area, and the other range is an area of old data that was not overwritten due to a failure. It shows that.

  In A (left figure), an area where the value has changed when viewed from the ECC block before the update is indicated by hatching. The data changed in each column, that is, each outer code is 16 bytes, which exceeds the correction ability of the outer code. That is, it cannot be corrected to old data.

  In B (right figure), when the ECC block to be updated is viewed as a reference, an area where the old value remains is indicated by hatching. The old value data included in each outer code is 6 bytes, and error correction is possible as the outer code. That is, it can be corrected to new data.

  Therefore, when the ECC block of FIG. 4 is reproduced, new data after update is obtained.

  FIG. 5 shows data when the recording of the ECC block of FIG. 15 (background art) is stopped by 3/4, that is, 156 lines, and recording is stopped due to a failure. The range from the data frame 0 to the 144th row in the data frame 11 indicated by the downward arrow is a newly overwritten region, and the other range is an old data region that was not overwritten by a failure. Indicates that there is.

  In A (left figure), an area where the value has changed when viewed from the ECC block before the update is indicated by hatching. The data changed in each column, that is, each outer code is 16 bytes, which exceeds the correction ability of the outer code. That is, it cannot be corrected to old data.

  In B (right figure), when the ECC block to be updated is viewed as a reference, an area where the old value remains is indicated by hatching. The old value data included in each outer code is 6 bytes, and error correction is possible as the outer code. That is, it can be corrected to new data.

  Therefore, when the ECC block of FIG. 5 is reproduced, new data after update is obtained.

  As described above, according to the optical disc recording / reproducing apparatus 1 to which the present invention is applied, when only a part of the ECC block is updated and rewritten, the PO parity that greatly reflects the influence of the update is recorded first. For this reason, when rewriting of the ECC block is interrupted due to a failure or the like, it is possible to reproduce the new data that was being updated by performing error correction on the old and new data remaining on the disk. Can be larger than the prior art.

  What is important here is that an ECC block that is partially updated and rewritten is extremely important management data such as volume management information and a directory. Therefore, the present invention greatly increases the possibility that the file system can be restored to the latest state in the event of a device failure, and is a technique useful for improving data security.

  The optical disc recording / reproducing apparatus 1 sends an ECC block when the host computer 60 sends a normal file such as information file data that is rewritten as a whole rather than a part of the management data. The converted data is recorded on the optical disc 2 according to the procedure according to FIG. 4 as before without following the procedure of FIG. That is, for every 12 inner code lines of a data frame, one PO parity inner code is inserted to form a 13-line recording frame, and recording is performed so that the PO parity inner code is inserted at equal intervals. To go.

  Whether the data recording command from the host computer 60 is a command for recording the management data or a command for recording a normal file such as the information file data, the address determination unit 15 records the data. It can be recognized by determining the area designation address. When recording management data, a directory address is specified, and when recording the normal data, for example, a cluster address is specified.

  Therefore, in the optical disc recording / reproducing apparatus 1, the address discriminating unit 15 discriminates the recording area designation address of the data, and the memory controller 14 changes the order of reading the data and PO parity from the memory 13 according to the discrimination result. it can.

  For this reason, when the ECC block of the management data is recorded on the optical disc 2, when only a part of the ECC block is updated and rewritten, the PO parity that greatly reflects the influence of the update is recorded first. Main data is recorded following PO parity.

  In addition, when recording information file data such as the above-mentioned normal data on an optical disk, one inner line of PO parity is inserted for every 12 inner code lines of the data frame to form a recording frame consisting of 13 lines, Recording is performed so that the inner code of the PO parity is inserted at equal intervals.

  Thus, the present invention need not be applied to all ECC blocks recorded on the optical disc 2, and may be mixed with a conventional method.

That is, the following two application methods may be adopted.
(1) Applies only to ECC blocks that record volume management information and directories.
(2) The present invention is applied only to a region whose functions are expanded while maintaining compatibility with the conventional technology.

  The optical disc recording / reproducing apparatus 1 uses the address discriminating unit 15 to discriminate whether or not the data recording command from the host computer 60 is the management data. However, as shown in FIG. The recording data command from the host computer 60 may be directly discriminated.

The optical disc recording / reproducing apparatus 1 has been described with reference to the example of the DVD-RAM that is a phase change optical disc.
[1] Recording is performed by the overwrite method.
[2] A failure may occur during recording of the ECC block.
[3] The file is managed by rewriting the same cluster many times.
The present invention is effective for all recording media satisfying the above condition.

  For example, when applied to a hard disk for a portable terminal, data can be rescued from a failure due to accidental dropping or the like.

  FIG. 7 is a diagram showing the hard disk drive unit 70 built in the portable information data recording / reproducing apparatus. The rotation drive unit 71 includes a spindle motor 71A and a sensor 71B that detects the rotation speed of the spindle motor 71A, and rotates the magnetic disk 72. The head 73 is adapted to read a signal recorded on the magnetic disk 72.

  The recording / reproducing signal processing unit 74 is a block to which the recording method and reproducing method of the present invention are applied. The head arm drive control circuit 75 is configured to move the head arm constituting the head unit 73 to a predetermined track position on the magnetic disk 72. The rotary spindle drive control circuit 76 performs drive control of the spindle motor that constitutes the rotary drive unit 71. The disk controller 77 controls the recording / reproducing signal processing circuit 74, the head / arm drive control circuit 75, and the rotary spindle drive control circuit 26. The recording information signal from the input terminal 78 is supplied to the recording / reproducing signal processing circuit 74 and the like after predetermined format processing and timing control are performed in the disk controller 77. A reproduction signal from the recording / reproduction signal processing circuit 74 is output from a terminal 79 after predetermined processing and control are performed in the disk controller 77.

  As shown in FIG. 8, the recording / reproducing signal processing unit 74 includes an ECC encoding circuit, a modulation circuit 82, a demodulation circuit 83, an ECC error correction circuit 84, a memory 85, and a memory that function in the same manner as shown in FIG. It has a controller 86. By providing the recording / reproducing signal processing unit 74, the hard disk drive unit 70 is shown in FIG. 2 when recording management data such as a directory for recording file names and volume management information for managing disk capacity. Similarly to the above, the PO parity that largely reflects the influence of the update is recorded before the inner code of the main data. For this reason, when the ECC block rewrite is interrupted due to an accidental drop or the like, the new data that was being updated can be reproduced by performing error correction on the old and new data remaining on the disk. The possibility is greater than in the prior art, and the data can be relieved.

It is a figure which shows the structure of an optical disk recording / reproducing apparatus. It is a figure which shows a mode that the ECC block of management data is recorded on an optical disk. It is a flowchart which shows the recording order when the ECC block of management data is read from a memory by a memory controller and recorded on an optical disk. It is a figure which shows the data when recording is stopped by failure when the ECC block is recorded 1/4 or 52 lines. It is a figure which shows the data when recording is stopped by failure when the ECC block is recorded 3/4, that is, 156 lines. It is a figure which shows the other structural example of an optical disk recording / reproducing apparatus. It is a block diagram which shows the structure of a hard-disk drive part. It is a block diagram which shows the internal structure of a recording / reproducing signal processing circuit. It is a figure which shows the data frame of DVD-RAM. It is a figure which shows the structure of the ECC block of DVD-RAM. It is the figure which assigned symbol B (j, i) for each byte of ECC block 208 rows x 182 columns for explanation. It is a figure which shows the recording order of each byte B (j, i) when recording an ECC block on a disk. It is a flowchart of the recording order when recording an ECC block on a disk. It is a flowchart of the reproduction | regeneration order when reproducing | regenerating an ECC block from a disc. It is a figure which shows the example of the ECC block in which a part of data was updated. It is a figure which shows the data when recording is stopped by failure when the ECC block is recorded 1/4 or 52 lines. It is a figure which shows the data when recording is stopped by failure when the ECC block is recorded 3/4, that is, 156 lines.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical disk recording / reproducing apparatus, 2 Optical disk (DVD-RAM), 3 Spindle motor, 4 Optical pick-up, 5 Thread motor, 6 Servo circuit, 7 I / F, 8 ECC encoding circuit, 9 Modulation circuit, 10 RF amplifier, 11 Modulation circuit, 12 ECC error correction circuit, 13 memory, 14 memory controller, 15 address discrimination unit, 16 system controller, 50 bus, 60 host computer

Claims (9)

In a recording apparatus for overwriting recording a digital signal on a recording medium,
A plurality of c data frames in which the digital signals are combined to form a matrix of a rows × b columns are arranged in a storage unit in a plurality of c and a × c rows × b columns, and at least each column is subjected to an encoding process. Error correction coding means for converting into an error correction code to which a correction parity of d bytes in the direction is added;
Among the error correction codes stored for each block in the storage unit, the storage unit control means for reading the correction parity part in the column direction first and then reading the main data part for the error correction code block related to the management data When,
A recording apparatus comprising: a recording unit configured to record a block of error correction codes related to management data read by the storage unit control unit on the recording medium in the reading order.   2. The recording apparatus according to claim 1, wherein the management data is data in which the predetermined unit block is partially updated, and is a directory or volume management information for managing information normal data.   The error correction encoding means performs encoding processing for each column as a first encoding into a · c rows × b columns made up of a plurality of c data frames arranged in the storage unit as a second encoding. The recording apparatus according to claim 1, wherein encoding processing is performed on each row. In a recording method for overwriting recording a digital signal on a recording medium,
A plurality of c data frames in which the digital signals are combined to form a matrix of a rows × b columns are arranged in a storage unit in a plurality of c and a × c rows × b columns, and at least each column is subjected to an encoding process. An error correction encoding step of converting the error correction code to which a correction parity of d bytes in the direction is added;
Of the error correction codes stored for each block in the storage unit, for the block of the error correction code related to the management data, the storage unit control step of reading the correction parity part in the column direction first and then reading the main data part When,
And a recording step of recording a block of error correction codes related to the management data read by the storage unit control step on the recording medium in the reading order. A recording apparatus that overwrite-records digital signals on a recording medium, and a plurality of c data frames in which the digital signals are combined to form a matrix of a rows × b columns is stored in a storage unit in a × c rows × b columns. Arranged and converted into an error correction code to which at least each column is encoded and a correction parity of d bytes in the column direction is added, and among the error correction codes stored for each block in the storage unit, management data As for the block of the error correction code related to the above, the correction parity part in the column direction is read first, followed by the main data part, and the block of the error correction code related to the read management data remains in the above reading order in the recording medium A playback device for playing back recorded data recorded in
Of the management data recorded on the recording medium, d byte correction parity portion in the column direction, and error correction means for performing error correction processing on the data portion,
In the recording apparatus, when the recording operation of the error correction block relating to the management data is stopped in the middle, both the first half data of the recording stop point and the second half data after the recording stop point are the error correction means. And reproducing the error correction process.   6. The reproducing apparatus according to claim 5, wherein the error correction means performs error correction processing by integrating the first half data and the second half data. A recording apparatus that overwrite-records digital signals on a recording medium, and a plurality of c data frames in which the digital signals are combined to form a matrix of a rows × b columns is stored in a storage unit in a × c rows × b columns. Arranged and converted into an error correction code to which at least each column is encoded and a correction parity of d bytes in the column direction is added, and among the error correction codes stored for each block in the storage unit, management data As for the block of the error correction code related to the above, the correction parity part in the column direction is read first, followed by the main data part, and the block of the error correction code related to the read management data remains in the above reading order in the recording medium A playback method for playing back recorded data recorded in
Of the management data recorded on the recording medium, comprising a correction parity part of d bytes in the column direction, and an error correction process for performing an error correction process on the data part,
When the recording operation of the error correction block related to the management data in the recording apparatus is interrupted in the middle, both the first half data of the recording stop point and the second half data after the recording stop point are both in the error correction step. And reproducing the data by performing error correction processing. In a recording / reproducing apparatus for overwriting recording a digital signal on a recording medium and reproducing the overwritten digital signal,
A plurality of c data frames in which the digital signals are combined to form a matrix of a rows × b columns are arranged in a storage unit in a plurality of c and a × c rows × b columns, and at least each column is subjected to an encoding process. Error correction coding means for converting into an error correction code to which a correction parity of d bytes in the direction is added;
Among the error correction codes stored for each block in the storage unit, the storage unit control means for reading the correction parity part in the column direction first and then reading the main data part for the error correction code block related to the management data When,
Recording means for recording a block of error correction codes related to management data read by the storage control means on the recording medium in the reading order;
Reading means for reading the management data recorded on the recording medium;
Of the management data read from the recording medium by the reading means, d byte correction parity portion in the column direction, and error correction means for performing error correction processing on the data portion,
In the recording apparatus, when the recording operation of the error correction block relating to the management data is stopped in the middle, both the first half data of the recording stop point and the second half data after the recording stop point are the error correction means. Into the error correction process,
The management data that has been subjected to error correction processing by the error correction means is written to the storage unit based on the control of the storage unit control means,
After partially updating the management data on the storage unit, input to the error correction encoding means,
Of the management data encoded based on the control of the storage unit control means, the correction parity part is read first, then the main data part is read and recorded on the recording medium by the recording means. A recording / reproducing apparatus. In a recording / reproducing method for overwriting a digital signal on a recording medium and reproducing the overwritten digital signal,
A plurality of c data frames in which the digital signals are combined to form a matrix of a rows × b columns are arranged in a storage unit in a plurality of c and a × c rows × b columns, and at least each column is subjected to an encoding process. An error correction encoding step of converting the error correction code to which a correction parity of d bytes in the direction is added;
Of the error correction codes stored for each block in the storage unit, for the block of the error correction code related to the management data, the storage unit control step of reading the correction parity part in the column direction first and then reading the main data part When,
A recording step of recording a block of error correction codes related to management data read out by the storage unit control step on the recording medium in the reading order;
A reading step of reading the management data recorded on the recording medium;
Of the management data read from the recording medium by the reading step, a correction parity portion of d bytes in the column direction, and an error correction step of performing error correction processing on the data portion,
When the recording operation of the error correction block related to the management data in the recording apparatus is interrupted in the middle, both the first half data of the recording stop point and the second half data after the recording stop point are both in the error correction step. Into the error correction process,
The management data that has been subjected to error correction processing by the error correction step is written to the storage unit based on the control of the storage unit control step,
After partially updating the management data on the storage unit, input to the error correction encoding step,
Of the encoded management data based on the control of the storage unit control step, the correction parity portion is read first, then the main data portion is read and recorded on the recording medium by the recording step. Recording and playback method.

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