JPH087496A - Method and device for recording/reproducing disk - Google Patents

Abstract

PURPOSE:To increase burst error correction ability of an optical disk drive, etc., using an existing IC without developing a new IC and without changing the number of bytes per sector in method and device for recording/reproducing a disk. CONSTITUTION:First of all, by a division process part 1, the user data of an existing ten interleaving length is divided into two data lines of the number of 1/2 bytes per sector, and dummy data parts are added to respective data lines to be made into two data lines of an existing system. Then, ECC are added to the data lines by using two pieces of existing ECC processors 3, 4. Then, the dummy data parts are removed from the data lines, and the recording data of twenty interleaving length are formed by combining them on a buffer memory 5 to be modulated and recorded. In such a manner, by making the twenty interleaving length, the burst error correction ability is increased, and by removing the dummy data at a recording time, the number of bytes per sector are fixed.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a read-only type, a write-once type,
In a rewritable optical disk drive for storing computer data, etc., by using a plurality of existing general-purpose ICs without developing a new IC, the increase in redundancy is minimized and the burst error correction capability is minimized. The present invention relates to a disc recording / reproducing method and device capable of increasing the number of discs.

[0002]

2. Description of the Related Art Since an optical disk is capable of high-density recording, there is a high probability that a read error will occur due to small dust or scratches when reading recorded data. Therefore, it is essential to add an error correction function. The most common method is the JIS standard (JISX6271).
The 10-interleave method (the number of data bytes per sector is 1024 bytes) or the 5-interleave method (the number of data bytes per sector is 512 bytes) to which an error correction code (ECC) as defined in 1) is added. In these, the maximum burst error byte lengths that can be corrected are 80 bytes and 40 bytes, respectively.

FIG. 9 shows a block diagram of a data recording / reproducing process in an optical disk drive. FIG. 9A shows a data recording process. First, from user data to EC
C is generated, this ECC is added to the user data to form recording data, and this recording data is modulated and recorded on the optical disc. On the other hand, FIG. 9B shows a data reproducing process. First, the recording data is read from the optical disc and demodulated. Next, error detection and correction processing is performed using the ECC added to the demodulated record data, and the user data is reproduced. A general-purpose IC called an ECC processor is used for these ECC creation processing and error detection / correction processing.

FIG. 10 shows a sector data format in the case of the conventional 10 interleave method. 1 in the layout frame
1024 bytes of user data represented by 1024, defect management pointers represented by P1,1 to P3,4, and CRC bytes represented by C1 to C4 are 10 rows × 1.
They are arranged in a matrix with 04 columns, 16 in each row.
ECC byte by byte (E1,1 to E10,16)
Is added to finally form a matrix with 10 rows and 120 columns.

[0005]

By the way, in the error correction method according to the above conventional technique, the correctable burst error length is proportional to the interleave length. Therefore, in order to increase the burst error correction capability, the number of bytes per sector should be increased and the interleave length should be increased. However, there is a demand that we do not want to increase the number of bytes per sector for the purpose of recording a small capacity file, and it is necessary to newly develop a dedicated IC such as an ECC processor. There is a problem that it takes time and cost, so it is difficult to put it into practical use.

The present invention has been made in order to solve the above-mentioned problems, and its purpose is to provide an existing general-purpose IC (EC).
By using a plurality of C processors, a disk recording / reproducing method capable of increasing burst error correction capability in an optical disk drive or the like without developing a new IC or changing the number of bytes per sector, and To provide a device.

[0007]

In order to achieve the above object, in the disk recording method of the present invention, first, user data is divided into a plurality of data strings each having a half of the number of bytes per sector having a predetermined interleave length. Then, for each of the plurality of data strings, a dummy data part having a number of bytes ½ of the number of bytes per sector is added, and then error correction is performed for each data string to which the dummy data part is added. A code is created, then only the dummy data part is removed from the data sequence to which the error correction code is added, and then the data sequence from which only the dummy data part is removed is combined to obtain the interleave length of the plurality of data. It is characterized in that recording data having a doubled interleave length is generated, and then the recording data is recorded on a disc.

Further, in the disc reproducing method of the present invention, first, data having an interleave length which is a multiple of the predetermined interleave length read from the disc is divided into a plurality of data strings having a predetermined interleave length, and then, A dummy data part used at the time of recording is added to each of a plurality of data strings, and then an error detection / correction process is performed using an error correction code included in each data string to which the dummy data part is added. , The dummy data part and the error correction code are removed from the processed data string, and then the plurality of data strings from which the dummy data part and the error correction code are removed are combined to obtain the data of the predetermined interleave length. It is characterized by playing.

Further, in the disk recording apparatus of the present invention, the user data is divided into a plurality of data strings each having a predetermined interleave length of ½ of the number of bytes per sector, and the sector for each of the plurality of data strings. Means for adding a dummy data part having half the number of bytes per hit, means for creating an error correction code for each data string to which the dummy data part is added, and a data string to which the error correction code has been added A means for removing only the dummy data portion from, and a means for generating a record data having an interleave length in which the interleave length is obtained by combining the data strings from which only the dummy data portion is removed on a buffer memory, To realize the above-mentioned disc recording method.

Further, in the disc reproducing apparatus of the present invention, means for dividing data having an interleave length that is a multiple of the predetermined interleave length read from the disc into a plurality of data strings having a predetermined interleave length; Means for adding a dummy data part used at the time of recording for each column, means for performing error detection / correction processing using an error correction code included in each dummy data part-added data column, and after the processing A means for removing the dummy data part and the error correction code from the data string, and a means for reproducing the data of the predetermined interleave length by combining the dummy data part and the data string from which the error correction code has been removed. The above-mentioned disc reproducing method is realized.

Further, in the above disc recording method, when the user data is divided into a plurality of data strings,
It is preferable that the user data be sequentially circulated from the first column and distributed to the plurality of data columns.

Similarly, in the above-mentioned disc recording apparatus, the means for dividing the user data into a plurality of data strings is divided into the plurality of data strings by sequentially circulating the user data from the first column at the time of the division. Is preferable.

[0013]

According to the disk recording / reproducing method and apparatus of the present invention, user data is divided into data strings of ½ bytes per sector of the existing interleave length, and dummy data of ½ bytes is also included in each of them. By adding a part, it is possible to divide each data string in the existing format and to perform error generation / detection / correction processing for the data string having the existing interleave length for each data string. This makes it possible to use general-purpose ICs for error generation / detection / correction processing, while generating as a recording data a data string excluding the dummy data part that is a multiple of the existing interleave length. By doing so, the error correction capability is increased by increasing the interleave length without increasing the number of bytes per sector.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a flow chart showing a recording method according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration for realizing the method. This embodiment shows an example in which two general-purpose ECC processors having a 10 interleave length based on the JIS standard are used to create recording data having a 20 interleave length.

In FIG. 2, 1 is a division processing unit for dividing user data and adding dummy data, 2 is a ROM for storing the dummy data, 3 and 4 are existing ECC processors having a length of 10 interleaves, and 5 is an ECC. Is a buffer memory used for combining data strings added with, and 6 is a memory controller for the buffer memory 5.

3 to 6 show E in this embodiment.
It is an explanatory view of the CC generation method, and the method will be described below together with the operation of the above apparatus with reference to these drawings.

(1) In the division processing unit 1, 1024 bytes of user data per sector are converted into even-numbered data (2, 4, ..., 1022, 1024) and odd-numbered data (1, 3, ..., 1021,). 1023) is divided into two data strings (see FIG. 3).

(2) Similarly, in the division processing unit 1, fixed dummy data is read from the ROM 2 to each of the data strings and added by 512 bytes each, and each data string has an existing 10 interleave length of 10 rows × 104 columns. The format has 1024 bytes. For these two data strings,
Two general-purpose ECC processors 3 and 4 are used, and ECC (160 bytes) corresponding to each is created and added (see FIG. 4).

(3) Only the dummy data part is removed from the data string shown in FIG. 4 (see FIG. 5). Note that this removal can be performed when writing to the buffer memory 5 via the memory controller 6.

(4) By the write operation of the memory controller 6, two data columns are combined on the buffer memory 5 to form a matrix of 20 rows × 68 columns (FIG. 6).
(See (a)). By the memory controller 6,
It is sequentially read from the top row by row, modulated, and recorded on the optical disc (see FIG. 6B).

Thus, a general-purpose E for 10 interleaves
By using two CC processors, the interleave length can be doubled to 20. As a result, the correctable burst error length also doubles, but since the dummy data part is removed, the number of bytes of user data per sector remains unchanged. However, since the number of bytes of the ECC is 160 bytes when one is used and 320 bytes, the disk capacity is somewhat sacrificed.

The burst error correction capability can be further increased by increasing the number of processors to be used, but since the number of ECC bytes also increases by that amount, the number can be determined depending on which of the correction capability and the disk capacity is prioritized. It may be selected appropriately.

Next, an embodiment of the method for reproducing the recorded data on the optical disk of the present invention will be described. FIG. 7 is a flow chart showing the embodiment, and FIG. 8 is a block diagram showing a configuration for realizing the method. The present embodiment shows an example in which the recording data of 20 interleave length recorded on the optical disc by the above-described recording method is subjected to error detection / correction processing by using two general-purpose ECC processors of 10 interleave length and reproduced. .

In FIG. 8, 11 is a division processing unit for dividing recording data read from an optical disc and demodulated and adding a dummy data portion, 12 is a ROM for storing the dummy data, and 13 and 14 are error detection / correction processing. Do 1
An existing ECC processor of 0 interleave length, 15 is a buffer memory A for rearranging a data string after error detection / correction processing to reproduce user data, 16 is a memory controller A for the buffer memory A 15, and 17 is the above A buffer memory B, 18 for temporarily storing the demodulated recording data of is a memory controller B for the buffer memory B.

The user data reproducing method of this embodiment will be described with reference to FIGS. 7 and 8 together with the operation of the apparatus.

(1) The recording data is read from the optical disc, demodulated and temporarily stored in the buffer memory B via the memory controller B18. The record data demodulated and temporarily stored is the array of 20 rows × 68 columns shown in FIG. Therefore, in the division processing unit 11, these 20 lines are converted into 1
It is divided every 0 rows and is read out as two data columns of 10 rows × 68 columns shown in FIG.

(2) Similarly, in the division processing section 11,
Between the 52 columns of the user data area and the 16 columns of the ECC area of each divided and read data row, the same 51
After reading the 2-byte dummy data portion from the ROM 12 and adding it as shown in FIG. 4, each data string is separately input to the general-purpose ECC processors 13 and 14. The general-purpose ECC processor 13,
14 executes error detection / correction processing by ECC.

(3) The ECC and dummy data section are removed from the data string output from the ECC processors 13 and 14. Note that this removal can be performed when writing to the buffer memory 5 by the memory controller 16.

In (4) and (3), the ECC processor 13 outputs odd-numbered data (1, 3, ..., 1021, 1023) of the 1024-byte user data, and the ECC processor 14 outputs even-numbered data. The data (2, 4, ..., 1022, 1024) is output. Therefore, by the write operation of the memory controller 16,
The two data strings are received alternately, and the buffer memory A1 is received.
The data is written one by one from the top in order from 5 to merge two data strings to reproduce user data of 1024 bytes.

In the above disc recording, it is clear that if user data is divided into three or more and three or more ECC processors are used, recorded data with an interleave length of 30 or more can be created. In the above embodiment, when dividing the data, the odd columns and the even columns are divided, but in the division of 3 or more, the data may be divided into the 3 or more data columns so as to rotate in order from the beginning. By doing this, burst errors are dispersed,
The probability of being able to correct increases. Of course, it goes without saying that the dividing method is not limited to the above. INDUSTRIAL APPLICABILITY The present invention can be widely applied to recording / playback of disc media in addition to various types of optical discs.

[0032]

As is apparent from the above description, according to the disk recording / reproducing method and apparatus of the present invention, a dedicated IC is used.
The burst error correction capability can be increased without newly developing the. This saves costs and time, and improves the reliability of the optical disc.

In addition, in the above, in particular, when dividing into a plurality of data strings of user data, the data is distributed to each data string so that the head data is circulated in order, the error correction probability is increased, and The reliability can be further improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a recording data creating method according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram for realizing the recording data creating method.

FIG. 3 is a diagram (part 1) for explaining the above-described recording data creation method.

4A and 4B are views for explaining the recording data creating method (part 2).

5A and 5B are views for explaining the recording data creating method (part 3).

6A and 6B are views for explaining the recording data creating method (Part 4).

FIG. 7 is a flowchart showing a method of reproducing a disc in the above embodiment.

FIG. 8 is a block configuration diagram for realizing the above reproducing method.

9 (a) and 9 (b) are block diagrams showing a general disc recording / reproducing process.

FIG. 10 is a configuration diagram of conventional recording data.

[Explanation of symbols]

 1 ... Division processing unit 2 ... ROM 3, 4 ... ECC processor 5 ... Buffer memory 6 ... Memory controller 11 ... Division processing unit 12 ... ROM 13, 14 ... ECC processor 15 ... Buffer memory A 16 ... Memory controller A 17 ... Buffer memory B 18 ... Memory controller B

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G11B 20/18 576 F 8940-5D

Claims (6)

[Claims] 1. First, user data is divided into a plurality of data strings each having a half of the number of bytes per sector of a predetermined interleave length, and then, the number of bytes per sector is divided for each of the plurality of data strings. A dummy data part having a number of bytes of ½ is added, then an error correction code is created for each data string to which the dummy data part is added, and then the dummy data is added from the data string to which the error correction code is added. Only the data part is removed, and then the data strings from which only the dummy data part is removed are combined to generate record data having an interleave length obtained by multiplying the interleave length by a plurality of times. A disk recording method characterized by recording to a disc. 2. First, data having an interleave length that is a multiple of a predetermined interleave length read from a disc is divided into a plurality of data strings having a predetermined interleave length, and then each of the plurality of data strings is recorded at the time of recording. The dummy data part used is added, and then the error detection / correction process is performed using the error correction code included in each data string to which the dummy data part is added. Next, from the processed data string, A disk characterized in that the dummy data part and the error correction code are removed, and then a plurality of data strings from which the dummy data part and the error correction code are removed are combined to reproduce the data of the predetermined interleave length. How to play. 3. A means for dividing user data into a plurality of data strings each having a half of the number of bytes per sector of a predetermined interleave length, and a unit of the number of bytes per sector for each of the plurality of data strings.
Means for adding a dummy data part having a number of bytes of / 2, means for creating an error correction code for each data string to which the dummy data part is added, and only the dummy data part from the data string to which the error correction code has been added And a means for combining the data strings from which only the dummy data portion has been removed on the buffer memory to generate recording data having an interleave length in which the interleave length is multiplied by the plurality of times. Disk recording device. 4. A means for dividing data having an interleave length that is a multiple of a predetermined interleave length read from a disc into a plurality of data strings having a predetermined interleave length, and a dummy used at the time of recording for each of the plurality of data strings. Means for adding a data part, means for performing error detection / correction processing using an error correction code included in each data string to which the dummy data part is added, and the dummy data part from the processed data string A disc reproducing apparatus comprising: a unit for removing an error correction code; and a unit for reproducing the data having the predetermined interleave length by combining the dummy data section and a data string from which the error correction code has been removed. 5. The disc recording method according to claim 1, wherein when the user data is divided into a plurality of data strings, the user data is sequentially circulated from the first column and distributed to the plurality of data strings. 6. The means for dividing user data into a plurality of data strings, wherein when dividing the user data, the user data is sequentially circulated from the first column and distributed to the plurality of data strings. Disc recorder.