JPS6361471A - Data recording method - Google Patents

Abstract

PURPOSE:To improve an error correction capability by forming data to be recorded to a two-dimensional array of (m) row and (l) column to make the reading/writing direction of data a column direction, adding an error correction code for every system in the respective row directions and selecting the length (m) in the column direction and the length (k) between servo signal areas. CONSTITUTION:Between the respective servo signal areas 3 on which the servo signal is written in a bit form, a data signal area 4 in which a data signal and an address signal are written and these areas are alternately disposed along the circumferential track of a magneto-optical disk 1. Herein, the length of the area 3 is defined to be two bytes, for instance, the length (k) of the area 4 to be 16 bytes and the data sequentially recorded on the area 4 to the two-dimensional array of the (m) row and (l) column. Namely, to the data of one sector and 512 bytes, the addition information of 16 bytes and an error detection code or the like are added to constituted the two-dimensional array data of four rows and 132 columns, namely, m=four bytes, l=132 bytes. In such a way, a relation in which (k) is four times of (m) is established to eliminate the runout of the error.

Description

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

A. Industrial field of application B0 Summary of the invention C8 Prior art 0 Problems to be solved by the invention E0 Means for solving the problems F1 Effects G. Example G-1, Data of the first example Structure (Fig. 1) G-2, Recording formant (Fig. 2) G-3, Other embodiments (Figs. 3 to 6) H0 Effects of the invention A, Industrial application field The present invention has the following characteristics: Regarding a data recording method for recording data on a recording medium such as a magneto-optical disk, in particular, a so-called LDC (LDC) is used in a data signal area of a disk-shaped recording medium in which servo signals and data signals are recorded alternately along tracks. Lon
The present invention relates to a method for sequentially recording two-dimensional array data such as g Distance Code.

B6 Summary of the Invention The present invention sequentially records data signals in each data signal area of a recording medium in which servo signal areas and data signal areas are provided alternately along the scanning direction during signal recording and reproduction. In a data signal recording method, data to be recorded is arranged in a two-dimensional array of m rows and 1 column, read and written in the column direction, and an error correction code is added to each row.
By creating a relationship between the column direction length m of the obtained two-dimensional array data and the length of the data signal area between the servo signal areas, one is an integral multiple of the other.
This improves error correction ability by suppressing the negative effects of error occurrence.

C9 Prior Art In recent years, optical recording media such as optical disks and optical 61 disks that utilize optical or magneto-optical signal recording and reproducing methods have been developed and are being supplied to the market. These optical recording media include digital audio discs such as so-called CDs (compact discs) and video discs.
Like disks, etc., there are so-called ROM (read-only memory) type recording media and so-called DRAW or write-once type recording media, in which various information signals are recorded in advance by the manufacturer in a non-rewritable manner and then supplied to the user. There is a so-called FROM (programmable ROM) type recording medium in which information signals can be written only once by the user, and a so-called RAM in which information signals recorded on a magneto-optical disk can be erased and rewritten. (Random Access Memory) type recording media, both of which have an extremely large recording capacity.

Each of these types of optical recording media is often used in the form of a disk, but they have been developed individually and were developed at different times, so they use different formats. For this reason, these types of disks are not compatible with each other, causing many inconveniences for both users and manufacturers, and there is an increasing demand from both users and manufacturers for a unified format. Here, as one of the technologies for realizing this unified format, similar to the so-called sector servo in hard disks in the field of magnetic disks, servo is applied to concentric or spiral tracks on the disk at predetermined intervals or The so-called 4:1 idea of sampling servo is to record servo signals at predetermined angles and perform continuous servo control by sampling and holding these discrete servo signals when driving the disk rotation. It is proposed that it be introduced. The data signal is sequentially recorded between each of the servo signals, and the servo signal recording area and the data signal recording area are alternated along the trunk direction, which is the scanning direction of the pink-up head, etc. It will be distributed to

In this case, the number of servo signals arranged for one rotation of the disk of the unified formant is limited to some extent depending on conditions such as disk rotation speed and servo 111B characteristics.
At present, it is necessary to record and form, for example, about 1,000 or more servo signals per revolution.

By the way, the recording capacity of such optical disks is extremely large, for example, about several hundred megabytes or more.
Error countermeasures against burst errors and the like are becoming important. 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 of error correction encoding for this purpose, but
For example, there is a coding system that arranges data for one sector of a disk in a two-dimensional matrix of m rows and n columns, adds an error correction code to each data series in the row direction, and reads and writes data in the column direction. Are known. In such a code system, the sequence length in the row direction, which is the direction of the error correction code generation sequence, is relatively long (for example, about 100 bytes), so
The interleaving depth is m in the column direction.

D1 Problem to be Solved by the Invention By the way, when recording data on a recording medium such as a disk, the two-dimensional array data of the LDC as described above is read out in the column direction, and the data signals between the servo signals are read out in the column direction. The data is recorded sequentially in the area. In this case, the data sequentially read out m pieces in the column direction is divided and recorded according to the length of the data signal area of the disk, etc., but the data structure of the two-dimensional array data is If the data recording format and the data recording format on the disc are set independently, various problems may occur.

For example, if a servo signal error occurs during signal reproduction, even if a single servo signal is in error and data in one data signal area is in error, the above two-dimensional array In the data, errors may not be contained within a predetermined range of columns, and errors may exist in the next column, resulting in a reduction in error correction capability in the row direction.

In view of the above-mentioned conventional problems, the present invention provides that data recorded in one data signal area between servo signal areas is within a certain number of columns in a two-dimensional array data structure such as the LDC. The purpose is to provide a data recording method that fits within the

E3 Means for Solving Problems In order to achieve the above-mentioned object, the data recording method according to the present invention has a servo signal area in which a servo signal is recorded and a data signal area in which at least a data signal is written.
In a method of sequentially recording data in each data signal area of a recording medium that is provided alternately along the head scanning direction during recording and reproduction, the data to be recorded is formed into a two-dimensional array of m rows and β columns, The data read/write direction is the column direction, and an error correction code is added to each series in the row direction, and the length m of the two-dimensional array data in the column direction and the data signal between the servo signal areas are The lengths m and k are selected such that one length is an integral multiple of the other (m and l are both positive integers).

The length m of data for one column of the F0 effect two-dimensional array data structure and the data length of the data signal area of the recording medium are an integral multiple of the other, so The data will always be within a certain number of columns, and will not extend beyond this certain number of columns to the next column, and data in one data signal area may become erroneous due to a servo signal error, etc. However, the number of error columns is limited to a fixed number.

G. Example Hereinafter, an example in which the data recording method of the present invention is applied to the case of recording data on a magneto-optical disk will be described with reference to the drawings.

FIG. 1 shows the data structure of one sector (for example, 512 hides) of a magneto-optical disk when data is recorded according to the first embodiment of the present invention, and FIG. The recording format of the magneto-optical disk 1 is shown. First, in FIG. 2, between each servo signal area 3 where a servo signal is recorded in a so-called focus form, there is provided a data signal area 4 where a data signal and an address (No. 8) are written. 4 is magneto-optical disk 1
are provided alternately along the circumferential tracks 2 of. Here, the length of the servo signal area 3 is converted into bytes, for example, 2 bytes, and the length of the data signal area 4 is, for example, 16 heights. Next, the data sequentially recorded in each data signal area 4 has a data structure of a two-dimensional array of m rows and e columns as shown in FIG. Additional information, error detection codes, etc. are added to form data in a two-dimensional array of 4 rows and 132 columns, ie, m=4 bytes, /=132 bytes. In this case, there is one difference between the sequence length m (4 bytes) in the column direction of the two-dimensional array data and the length (16 bytes) of the data signal area 4 between the servo signal areas 3 in FIG. is an integer multiple of the other, that is, in this case, k is four times m (k-4m)
has been established. Therefore, since the data in one data signal area 4 is arranged without excess or deficiency within the range of the four columns of the two-dimensional array data, an error due to the servo signal may occur and the data in one data signal area 4 When an error occurs, the error data does not extend beyond the four columns of the two-dimensional array data to the next column, etc., and deterioration of the error correction ability can be suppressed.

G-1. Data structure of the first embodiment (Fig. 1) Refer to Fig. 1 for the data structure of l sectors to be recorded on the magneto-optical disk in the first embodiment of the present invention. This will be explained in detail. Note that FIG. 1A schematically shows the entire data structure of one sector, and FIG. 1B shows only a portion of FIG. 1A in an enlarged manner.

In a magneto-optical disk, the standard unit data amount recorded in one sector on a recording trunk is 512 bytes, considering that the magneto-optical disk is used as an information recording medium for a computer, for example. FIG. 1 shows an example of the data structure when this l sector is 512 bytes.

In other words, the original valid data is 512 bytes, but
16-height additional information is added after the valid data, resulting in 528 bytes, and this 528-byte data is divided into 4-height units, each with a constant value corresponding to one column, resulting in 4 bytes in the column direction and 132 bytes in the row direction. (4x 132=528)
are arranged two-dimensionally. Here, the above 16-byte additional information includes, for example, reserve information such as a link axis to the next sector and data identification information, and an error detection code generated for this reserve information data and the above-mentioned 512-byte data. EDC etc. are used.

By adding a 16-byte error correction code ECC to each row of data (132 bytes) of the above 528-byte two-dimensional array data, a total of 592
The bytes are arranged in a so-called LDC (Long
distance code). Here, as the above error correction code, for example, C (148
, 132) Reed-Solomon codes may be used. The two-dimensional array data having such an LDC configuration is written and read out one column at a time in the column direction, and is sequentially recorded in the data signal area 4 of the disk.

G-2. Recording Formant (FIG. 2) Next, the recording form of the recording back and track on the magneto-optical disk on which the two-dimensional array data of the LDC configuration is recorded will be explained in more detail.

In the second article, the magneto-optical disk 1 has a diameter of about 13 (maximum) in the case of a so-called 5-inch type, and one side has a diameter of 3.
It has a storage capacity of 00 MB or more. This disk 1 is rotated at a constant angular velocity, and data is recorded by forming tracks 2 in concentric circles or spirals, for example, with one trunk per rotation. The number of tracks on one side is about 18,000 to 20,000, and each track is divided into (n+1) sectors, for example, 32 sectors, as shown in FIG. 2A. Next, as shown in an enlarged view in FIG. 2B, the sector formant is such that the servo signal area 3 in which servo pits are recorded and the data signal area 4 in which data signals and address signals are written alternately. Address signals such as sector addresses are recorded in the data signal area at the head of the l sector in the form of, for example, the pits. The lengths of the servo signal area 3 and data signal area 4 are, for example, 2 bytes and 16 bytes, respectively, when converted into bytes. Therefore, in the case of this embodiment, since the data of the entire two-dimensional array per sector is 592 bytes, one sector's worth of data is recorded across 37 areas of the data signal area 4, and the address signal is One data signal area 4 for recording is added, and a total of 38 sets of strings of the servo signal area 3 and the data signal area constitute one sector.

Here, the length m in the column direction of the two-dimensional array data in FIG. 1 is 4 bytes, and the length of one data signal area 4 is 1.
Since it is 6 bytes, data in one data signal area 4 is allocated to every four columns without excess or deficiency, and the data in any one data signal area 4 exceeds the range of the four columns of the two-dimensional array data. It does not extend to the next column, etc. In addition, the servo signal Sv is as shown by the broken line in FIG. 1B.
One piece is arranged for every four columns of the two-dimensional array data. Therefore, for example, if error information is known when an error occurs due to a servo signal, the error range on the two-dimensional array data can be determined, simplifying the error correction operation, and even when a burst error occurs. is easy to limit.

G-3. Other Embodiments (FIGS. 3 to 6) Next, some other embodiments of the present invention will be described with reference to the drawings. In the following embodiments, in order to simplify the explanation, it is assumed that an optical disk 1 having a recording format similar to that shown in FIG. 2 is used as a recording medium, and a data signal area 4 between servo signal areas The length of is set to 16 bytes.

First, FIG. 3 shows an example of the data structure of one sector of data recorded by the data recording method according to the second embodiment of the present invention. In this case, the data size of one sector is assumed to be 1024 bytes. There is.

In this Figure 3, the original effective data for one sector (
1024 bytes), 16 bytes of additional information is added to make 1040 bytes, and this is divided into 8 bytes in the column direction to create two-dimensional matrix array data of 130 bytes in the row direction and 8 bytes in the column direction. is forming. here,
The 16-byte additional information may be composed of, for example, reserve information and an error detection code EDC, as in the embodiment shown in FIG. For each row (130 bytes) of the two-dimensional array data obtained in this way,
6-height error correction code ECC, for example C(146,
130) Generate and add a Reed-Solomon code to create the so-called L
It constitutes DC data. 2 of such LDC configuration
The dimensional array data is read and written column by column in the column direction, and is sequentially recorded in each 16-byte data signal area 4 (see FIG. 2) of the disk.

That is, in the second embodiment shown in FIG. 3, the sequence length m in the column direction of the two-dimensional array data is 8 bytes, and 1
Since the length of one of the data signal areas is 16 bytes, m:=1:2, which means that the length of the two-dimensional array data is 16 bytes.
The data for one data signal area can be allocated within the range of a column without any excess or deficiency, and the data of any one data signal area is not arranged beyond the range of the two columns. Further, the servo signal Sv is distributed one by one to every two columns of the two-dimensional array data, as shown by the broken line in FIG.

Next, when the data size of one sector is 2048 bytes, the length m of one column may be set to 16 bytes, as in the third embodiment shown in FIG. 4, for example. In this third embodiment, 16 bytes of additional information are added to the data of 2048 hides to make a total of 2064 bytes, with 16 rows and 129
After forming two-dimensional array data of columns, a 16-byte error correction code ECC is added to each row (129 bytes). In this case, the length of the above data signal area (
16 bytes) and the length in the column direction (16 bytes) are equal (rn: k = 1: 1), and there is no excess or deficiency of data for one data signal area within the range of one column of the two-dimensional array data. It will be allocated without any restrictions. Further, the servo signal S■ is distributed one to each column of the two-dimensional array data, as shown by the broken line in FIG.

Furthermore, Figure 5 shows that the data size of one sector is 4096.
An example of the data structure when using bytes is shown. In the example shown in FIG. 5, 32 bytes of additional information are added to 4096 bytes of data to form a total of 4128 bytes of data into two-dimensional matrix array data of 32 rows by 129 columns. In this case, the length m in the column direction is 32 (bytes), and the length of the data signal area 4 is (16 bytes).
(m: k=2:1), so 2
The data of two data signal areas 4 is allocated to one column of dimensional array data without excess or deficiency. Further, two of the servo signals Sv are distributed to each column of the two-dimensional array data, as shown by the broken line in FIG.

In the first to fourth embodiments described above, one row of two-dimensional array data before error correction encoding is approximately 128 bytes.
(10-odd bytes) Although we have explained the example, the length of one line can be set to any other length.

For example, in the fifth embodiment shown in FIG. 6, 528 bytes of data consisting of 16 bytes of additional information added to 512 bytes of data in one sector are divided into 8 bytes and sequentially arranged in the column direction. They are arranged to form a two-dimensional array of 8 rows and 66 columns. For each row (66 bytes) of this two-dimensional array data, a 16-byte error correction code ECC1, for example, C(82,66) Reed-Solomon code is generated and added to form a two-dimensional array of 8 rows and 82 columns. There is. Although the length of one data signal area 4 of the magneto-optical disk 1 (see second concavity) which is a recording medium is 16 bytes, the length m of the two-dimensional array data in the column direction is 8 bytes. , m: = 1:2, and it is possible to allocate just enough data for one data signal area within the range of two columns of the two-dimensional array data. That is, the data in any one data signal area is not arranged beyond the range of the two columns, and the servo signal Sv is arranged in the two-dimensional array data as shown by the broken line in FIG. One piece will be distributed to each of the two columns.

In addition, various modifications can be made without departing from the gist of the present invention. For example, the present invention can be easily applied to disk-shaped recording media other than magneto-optical disks. Also, the length l in the row direction and the length m in the column direction of the two-dimensional array data
Of course, the length of the data signal region, etc., are not limited to the numerical values in the above embodiments, and can be set arbitrarily within the range that satisfies the condition that m:k is a ratio of 1 to an integer value. It is.

H0 Effects of the Invention According to the data recording method of the present invention, even if an error occurs in the servo signal and data in one data signal area becomes an error, data within a certain number of columns of two-dimensional array data can be recorded. No more errors will occur, the error correction ability can be improved, and the ability can be maximized even in burst errors. Further, when error information is passed to the ECC in the event of a servo signal error, handling is easy because the error does not exceed the range of the fixed number of columns.

Furthermore, since the entire two-dimensional array data is divisible by the length of the data signal area, and no incomplete data is generated, there is no need to mix and record address signals and data signals in the data signal area. A switching operation between the servo signal and the data signal does not occur in the data signal region between the servo signals.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a data structure for one sector to be recorded by a data recording method according to a first embodiment of the present invention, and FIG. 2 is a schematic diagram showing a recording pattern of a magneto-optical disk in this embodiment. , FIG. 3 to FIG. 6 are diagrams showing the data structure of one sector applied to the second to fifth embodiments of the present invention, respectively. ■...Magneto-optical disk 2...Track 3...Servo signal area 4...Data signal area

Claims (1)

[Claims] For a recording medium in which a servo signal area in which a servo signal is recorded and a data signal area in which at least a data signal is written are provided alternately along the recording/reproduction scanning direction, each of the data signals In a data recording method in which data signals are sequentially recorded in an area, the data to be recorded is divided into m rows and l columns (m and l are positive integers).
The data is formed into a dimensional array, the data read/write direction is in the column direction, and an error correction code is added to each series in the row direction, and the length m in the column direction of the two-dimensional array data and the servo Each length m is set so that one is an integer multiple of the other with respect to the length of the data signal area between the signal areas (k is a positive integer).
, k.