JPS6398876A - Data recording method - Google Patents

Abstract

PURPOSE:To record a data with optimum data structure in response to applications or importance by making all data sizes the same after generating and adding a size and error correction code of an input data, adopting data structures of 2 kinds or over and selecting them properly. CONSTITUTION:The method selects any of at least two kinds of data structures for a product code or other code according to applications or importance so as to change the physical format on a recording medium and the data size. That is, one input data is sectioned at each N-byte (e.g., 1024) of the data size of one sector, adds additional information as required to arrange it an a 2-dimension matrix and the 1st recording data structure comprising 1248 bytes generated and added with two systems of error correction codes C1, C2 and the 2nd recording data structure comprising 1248 bytes added and generated with the one system of error correction code are formed to then arrangement data. Then any of both the data structure is selected and recorded.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

C. Industrial application field B1 Overview of the invention C1 Prior art 9 Problems to be solved by the invention E1 Means for solving the problems F0 Effect G Example G-1 Data structure of one example (Figures 1 and 2) G-2, Formant (Figure 3) G-3, Data structure of other embodiments (Figures 4 and 5) G-4, Other examples Data structure of the embodiment (Fig. 6) The present invention relates to a method for recording data on a recording medium such as a data signal.

[31 Important aspects of invention Is this invention a record? In a signal recording method in which data signals are recorded on a recording medium such as a disk in which the iJT area is divided into a plurality of recording blocks such as sectors, the size of input data to be recorded and all data after error correction code generation and addition are determined. With the same size, two or more types of data structures are adopted, and one of these data structures is selected according to the purpose, etc., and i! By sequentially recording data signals with the selected data structure in the recording blocks of the recording medium, it is possible to record data with a Q-appropriate data structure depending on the purpose of the data.

C1 Conventional technology Various types of signal recording media are known, but recording media such as magnetic disks, in which the recording area is divided into sectors and even blocks, are not capable of so-called random access. It is becoming widely used because it is easy to implement and management of recorded data is easy. Incidentally, in recent years, optical recording media such as optical disks and magneto-optical disks using the optical or magneto-optical No. 13 recording and reproducing method, which have an extremely large recording capacity M, have been developed and are being supplied to the market. Purchasing recording media such as optical discs, etc.
For example, it is extremely large, on the order of several hundred megabytes or more, and it is important to take measures against burst errors and the like. For this reason, it is common practice to add error detection or error correction codes to the data to be recorded.

There are various methods for this error correction encoding, but for example, for data of 512 hides corresponding to one sector of a disk, additional information of approximately 16 heights is added as necessary, and the data is encoded in m rows and n columns. Arranged in a two-dimensional 7 trix shape,
Each f'? of this two-dimensional array data? A so-called product code is often used, in which a first error correction code is generated and added to the data in each column, and a second error correction code is generated and added to the data in each column. Codes that add an error correction code to each data series in the row direction of the two-dimensional array data and read and write data in the column direction are also used.

D0 Problems to be Solved by the Invention By the way, for the above-mentioned optical recording medium, audio data (
Applications such as recording data signals with high correlation between data obtained by converting analog No. 3 to digital signals, such as No. 3 and video data signals, which are continuous in time, are also conceivable. Therefore, for example, a recording method is desired in which the error correction code and the like can be separated from the product code and other codes depending on the application.

In addition, depending on the importance of the data you are trying to record,
It is also conceivable to switch between the above product code and other codes with different error correction capabilities.

If you want to make such a data structure switchable,
If the data size of each data structure and the physical format of the recording medium are different, it is undesirable in terms of interchangeability and versatility of the medium.

Therefore, the present invention enables selection of one of the above-mentioned product sign υ and at least two types of data with codes other than each +, l, and i J according to the purpose, importance of the data, etc. The purpose of the present invention is to provide a data recording method that does not cause any changes to the data size or physical recording format on the recording medium.

Means for Solving Problem E9 In order to achieve the above-mentioned object, the data recording method according to the present invention sequentially records data signals on a recording medium in which the signal recording area is divided into a plurality of recording blocks. In the data recording method described in Recording-4, input data to be recorded is divided into a certain number of words N according to the recording block, and if necessary, information is attached to the data in a two-dimensional matrix form. A two-dimensional reading error correction code is generated and added to this two-dimensional array data to create a two-dimensional array consisting of M words as a whole.
The first recording data structure obtained by configuring the dimensional array data and the input data to be recorded are set to the constant number of words N.
; σS21λ divided 1. P/I: Accordingly, (= 1 additional information is added and arranged in 2 tarmatrix 4 rows, 1 system of error correction code is generated and added to this 2-dimensional array data, and the above M words are added as a whole. a second data structure obtained by forming two-dimensional array data consisting of It is characterized in that data signals of a data structure are sequentially recorded on the recording block I cock of the recording medium.

F3 effect Depending on the purpose and importance of the data you are trying to record?
! Data can be recorded by selecting the most suitable one from among several types of data structures.

G. Example Hereinafter, as an example of the data recording method of the present invention, light (d
Please refer to the drawing for an example of application when recording data on a disk! Mj j, /; but) I need an explanation.

FIG. 1 shows one example of an input data signal to be recorded on a magneto-optical disk by the recording method No. 1□ of an embodiment of the present invention.
When the sector data size (or so-called effective data size) N is, for example, 1024 hides, the first
Figure 2 shows a specific example of the data structure of 1.
A specific example of the second data structure obtained by performing error correction encoding processing using so-called LDC when the data size of a sector is 1024 bytes is shown. Also, Figure 3 shows
The recording format of the magneto-optical disk 1, which is the recording medium described above, is shown.
, i track) 2 is formed, and this recording track 2 is divided into sectors as a plurality of recording blocks.

G-1, - Data structure of the embodiment (Fig. 1, Fig. 2) First, in the example of Fig. 1, regarding the effective input data to be recorded, the data size of 1 sector is N,
In other words, it is divided into 1024-byte units, and if necessary, for example, 32-byte additional information is added (=I to make 1056 bytes, and this 1056-byte data is divided into 24 rows and 44 columns of 2
Dimension matrix 4. Arranged in ζ. Two systems of error correction codes c1 and Ct in the row direction and column direction are generated and added to this two-dimensional array data, resulting in a total of M words, for example, 26 rows and 48 columns of two-dimensional array data consisting of 1248 bytes. A first recorded data structure is formed.

Here, to explain an example of the above additional information, 24 bytes out of 32 bytes are reserved information filt;
For example, link information to the next sector, data identification information, etc. are inserted. Furthermore, an 8-byte error detection code EDC is generated for a total of 1056 high 1 data including this reserve area data, and inserted into the last 8 hides of the additional information 32 hides. Next, as the first factor correction code, for example, C, (48, 4
4) Using a Reed-Solomon code, for example, a Cz (26, 24) Reed-Solomon code may be used as the second error correction code. Two-dimensional array data with such a product code structure can be written and read in the row direction 651.
This is done line by line.

Next, in the example of FIG. 2, the effective input data to be recorded is divided into N words, that is, every 1024 bytes, and 1056 bytes of data to which 32 bytes of additional information are added are divided into 8 rows and 132 columns of two-dimensional data. arranged in a matrix,
One system of error correction code C is generated and added to this two-dimensional array data to create a second recording data structure of the two-dimensional array data consisting of the above M words, that is, 1248 bytes in 8 rows and 156 columns. is forming. The code system in this case is LDC (Long Distance
Cod+.), and the interleaving depth is the length in the column direction.

Here, the additional information of 32 hides may be increased by +11 by, for example, the reverb information of 24 hides and the error detection code EDC of 3 hides, as in the example of FIG.

For example, the 24-hyde error correction code that is generated and added to each row (132 hides) of the 1056-height two-dimensional array data at the stage where the 32 hides are added is a C(156,132) Reed-Solomon code. should be adopted. Two-dimensional array data having such an LDC configuration is sequentially output and written column by column in the column direction.

Either one of these first and second data structures is selected, and the data signal of the selected data structure is sequentially recorded in each sector of the optical (5i) disc, which is the recording medium.

That is, in a magneto-optical disk, recording [1. Is there an error correction code behind the processed data? = l addition 1) The effective data size excluding 7 reports etc. is, for example, 512 hide or 1024 hide, considering that the optical disc is used as an information recording medium for computers. By adopting the data structure shown in Figures 1 and 2 above, the above 1-sector data, 4) ° size, and additional information and error correction code are added. Data 1. without changing any data size. The IS structure can be switched between the product code structure and the LDC structure.

When switching to the LDC code mentioned above, the shortest distance between the codes of the error correction code system per line increases to 25, and the error detection and correction ability is greatly improved, so the reliability is particularly improved. This is suitable for recording important data that requires the following.

G-2, Recording format (Figure 3) Next, "-2"
A recording format on a magneto-optical disk in which dimensional array data is recorded will be schematically explained with reference to FIG.

In FIG. 3, the magneto-optical disk 1 has a diameter of about 13 cm in the case of a so-called 5-inch type, and has a diameter of about 30 cm on one side.
It has a storage capacity of 0 MB or more. This disk 1 is rotated at a constant angular velocity, and data is recorded by forming, for example, a spiral track 2 from a concentric ring 1b, with one track per rotation. The number of tracks on one side is about 18,000 to 20,000, and each track is divided into n sectors from sector 0 to sector n-1, for example, 16 sectors or 32 sectors, as shown in Figure 3A. ing.

Each sector further includes a servo No. 13 area 3 in which servo signals are recorded in the form of bits, and a data/address signal area 4 in which data signals and address signals are written, as shown in FIG. 3B. The data address signal area 4 at the beginning of one sector is divided into 'fM RMi.
At least an address signal is recorded therein. The length of the servo signal area 3 and the length of the data/address signal area 4 are, for example, 2 bytes and 16 heights, respectively. In this way, when the length of the data I 3 area 4 is 16 heights, in the data structure of the product code shown in FIG. Therefore, 3 pieces of data per line (1", the data in No. 1 area 4 is assigned exactly υ1, and the data in one data signal area 4 spans two lines of 11-recording code. Furthermore, in the so-called LDC data structure shown in Figure 2, since the sequence length in the column direction, which is the write/read direction, is 8 hides, Data is allocated just enough to the two columns of the LDC code system, and does not overflow to other columns.

That is, servo signals SV as shown by broken lines are arranged at two-column intervals of the two-dimensional array data shown in FIG.

From these facts, in the case of the data structures shown in FIGS. 1 and 2, there is good correspondence between the recording format on the disk and the data structure, and for example, servo signals may be lost due to defects on the disk, etc. Even when an error occurs and all the data in the data No. 13 area 4 becomes unreliable, the spread of the error is within one line in the case of the above product code, and the above LDC
In this case, it is possible to limit the number of rows to two or less, thereby preventing the error correction ability from deteriorating.

G-3, Data structure of other embodiments (Figs. 4 and 5) Next, Figs. 4 and 5 show an example in which the data size N for one sector is 512 hides. This will be explained with reference to.

In the example of FIG. 4, for example, 16 bytes of additional information is added as necessary to the 512 bytes of effective input data to be recorded, making the total 528 bytes.
Byte data is arranged in a two-dimensional matrix of 12 rows and 44 columns. For this two-dimensional array data, two systems of error correction codes are used, namely, the error correction code C in the row direction.
1 and column direction error correction code C2 with generation jJl]
A first recorded data structure is formed by two-dimensional array data of 14 rows and 48 columns, which is composed of M words, for example, 672 hides. In this case, each error correction code is, for example, C, (48,=14) lead code,
A Solomon code and a C2 (14,12) Riet-Solomon code may be used. The reading/writing direction of this +J'J code is the row direction.

Without changing the data size after generating and adding the effective data AJ size and error correction code to the data structure of the product code with an effective data size of 512 Hyde, the I , the data structure of DC can be realized. That is, in this FIG. 5, the above 16 bytes are added to the effective data of 512 bytes, which is the same data size as in FIG. data is arranged in a two-dimensional 7-trix form of 8 rows and 66 columns.An error correction code C is generated and added to each row of this two-dimensional array data, resulting in a total of M words, or 672 hides. A first recording data structure consisting of two-dimensional array data of 84 rows and columns is formed.

In this case, the above error correction code includes C(84,66)
A Riet-Solomon code may be used.

Note that the above additional information should be 16 heights, for example, 12 heights including link information to the next sector, data identification information, etc.
A1: 4 was added to the byte reserve information and a total of 524 hide data including this reserve information.
Byte error detection code EDC may be used.

One of these two types of data structures with the same data size as shown in Figures 4 and 5 is selected depending on the purpose and importance of the recorded data, and the data in the selected data structure is can be recorded on a magneto-optical disk or the like. In each of the data structures shown in FIGS. 4 and 5, the length in each write/read direction, that is, the product in FIG. The high 1 in the row direction of the code (48 bytes) and the number of bytes in the column direction of the LDC in FIG. (3 times) or one integer (1/2), the spread of the error area when a burst error occurs is regulated within a predetermined row or column, and the error correction ability is Prevent the decline in

G-4, and further data of the pond example + jSi input (th (〉
Figure) By the way, the number of hides (interleave depth) in the column direction in the above L I) C structure is set to 1. In the case where the setting is made regardless of the number of byes (16 high 1 to 1) of the h data signal area 4, a data structure as shown in FIG. 6, for example, can be used. In the case of this FIG. 6, the effective data 512
Append j';t to byte? The 528 bytes of data obtained by adding FJ 16 heights are arranged in a two-dimensional matrix of 6 rows and 88 columns, and for each row of 88 hides of data, for example, C (112, 88) read. An error correction code using Solomon code is generated and added.

Therefore, the obtained two-dimensional array data has 6 rows and 112 columns, totaling 672 bytes, and has the same data structure as the examples in Figures 4 and 5. Note that the additional information shown in FIG. 6 may also be composed of 14-hide reserve information and a 4-hide error detection code EDC, similar to the examples shown in FIGS. 4 and 5.

According to the data structure shown in FIG. 6, the above-mentioned second
Similar to the data structure shown in the figure, the shortest inter-symbol distance ^11 is as large as 25, the error correction ability is high, and it is suitable for recording 1* required data.

Note that the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention. For example, it goes without saying that the series length in the row direction and column direction of the two-dimensional array data, the amount of data in one sector, etc. are not limited to the numerical values of the above embodiments, and can be arbitrarily set.

1 (1) Effects of the Invention According to the data recording method of the present invention, data can be recorded by selecting the most suitable one from among a number of types of data structures, depending on the purpose and importance of the data to be recorded. It can be carried out.

[Brief explanation of the drawing]

1 and 2 are diagrams showing first and second data structures, respectively, to be recorded by a data recording method according to an embodiment of the present invention, and FIG. 3 is a diagram showing recording of a magneto-optical disk in the embodiment. JA style diagram showing an example of the format, No. 4
5 and 5 are diagrams respectively showing the first and second data structures applicable to other embodiments of the present invention, and FIG. 6 is a diagram illustrating the second data structure in still another embodiment. . 1... Magneto-optical disk 2... Track 3... Servo signal area

Claims (1)

[Claims] In a data recording method for sequentially recording data signals on a recording medium in which a signal recording area is divided into a plurality of recording blocks, the input data to be recorded is divided into a certain number of words N according to the recording blocks. The data is divided into sections, added with additional information as necessary, arranged in a two-dimensional matrix, and two systems of error correction codes are generated and added to this two-dimensional array data, resulting in a two-dimensional array consisting of M words as a whole. A first recording data structure obtained by configuring data, and dividing the input data to be recorded into the constant number of words N, adding additional information as necessary and arranging it in a two-dimensional matrix; A second recording data structure obtained by generating and adding one system of error correction codes to this two-dimensional array data to construct two-dimensional array data consisting of the above M words as a whole, A data recording method comprising: selecting at least one of the first and second data structures, and sequentially recording data signals of the selected data structure in recording blocks of the recording medium.