JP3125817B2 - Data recording method and data reproducing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording data on a disk-shaped recording medium or the like.

[0002]

2. Description of the Related Art In a data recording device such as a hard disk device, a floppy disk device, or a magneto-optical disk device, the minimum unit of data access is a data block called a sector. These data storage devices are used as an external storage device of a computer. Conventionally, the size of a data block per sector, which is a unit of the access (hereinafter referred to as a sector size).
The mainstream was 512 bytes.

However, in recent years, with the background of increasing the capacity of data files and improving the reliability of data, it has been called for to increase the sector size.
There are media that handle data in units of bytes or about 2.5 Kbytes. Therefore, 512 bytes,
There is a strong demand for compatibility between these large-capacity sector sizes, and various proposals have been made.

[0004]

These proposals basically consist of stacking a plurality of small sectors having a small data size (for example, 512 bytes) to form a large sector having a larger size (for example, 2.5 Kbytes). The data in the small sector unit is recorded and reproduced continuously. For this reason, the protection against burst errors has been inevitably reduced for data in small sector units.

In view of the above points, the inventor of the present application has
We have proposed a new data recording method that can ensure data reliability even for data with a small sector size.
The data recording method proposed earlier, for example,
If such a servo scheme optical disk drive, utilizes the fact that it is recorded and reproduced by the smaller data size than the sector size.

Namely, the sample servo scheme optical disk (including a magneto-optical disk), as shown in FIG. 6, the staggered mark including pits 21 and 22 a pair of distributed to the left and right from the track center 20 recorded service Boeria as, along with being preformatted at predetermined intervals, data area Ad and time, are spatially separated. It referred to the area of the unit including the servo area As and the data area Ad segment, the sample servo
For square type can record and reproduce data in the segment unit.

In the invention proposed earlier, the user sector size is recorded and reproduced on the disk 1 with compatibility between a small sector of, for example, 512 bytes / 1 sector and a large sector of 2560 bytes / 1 sector. In hitting
For example, as shown in the recording pattern on the disk 1 in FIG.
The data is recorded and reproduced so as to form a data recording area Db for a plurality of large sectors. In this case, when writing data for one small sector to the disk 1, the data for one small sector is written. Divide into units of one segment,
The data of the divided one segment unit is recorded in discrete segments, for example, in every five segments.

An example of the invention proposed above will be described in more detail. In this case, the data formats of the small sector and the large sector are as shown in FIGS.
FIG. 8 shows a data format of a small sector in this example. That is, the data of the small sector is a total of 52 bytes of user data of 512 bytes and control data of 8 bytes.
As shown in FIG. 8, the 0-byte data is horizontal × vertical = 10
The data is arranged in 4 (bytes) × 5 (rows), and an error correction code is generated for the 520 bytes of data, and
It is formed by adding a parity of 0 bytes (16 bytes × 5 rows). The data read / write direction is vertical, but for one segment (4 bytes x 5 rows = 20 bytes)
Each time the data is read from the memory and recorded on the disk as will be described later, the reproduction data from the disk is written to the memory every segment.

In this example, as the error correcting code, for example, (120, 104, 17) Reed-Solomon codes are generated for each row of 104 bytes of data to generate 16 bytes of parity. Is done. Therefore, the data of one sector is 600 bytes in total. 1
An error in a small sector can be corrected using the parity within the range of its error correction capability.

The data of the large sector has a structure equivalent to that of the five small sectors stacked in the column direction as shown in FIG. That is, for the 104 bytes of data in each row, the (120, 104, 17) Reed-Solomon code is generated to generate a 16-byte parity, for example, with respect to 104 bytes of data in each row in the horizontal direction. The vertical direction is 5 rows × 5 = 25 rows.

In this case, the read / write direction of the data on the memory is the vertical direction in FIG. 9, but the memory is sequentially read in the vertical direction by 4 bytes every 5 rows (1 segment of 20 bytes in total). Data is read from
The data in the unit of a segment which is continuously recorded on the disk and reproduced from the disk is sequentially written in the memory in the vertical direction to form a large sector as shown in FIG. At this time, the recording pattern of the large sector shows that the data of the small sector of five rows each, as described later, is 1 data.
The data is recorded every five segments in segment units, and therefore, compatibility between the small sector and the large sector can be obtained.

FIG. 10 shows a track format in the case of this example. In this example, as shown in FIG. 10D, one segment includes a 4-byte servo area, a 1-byte reference area for reproducing clock synchronization, and a 20-byte user data area. Then, as shown in FIG. 10A, one track is
It includes data for 30 small sectors (small sector numbers “0” to “29” are sequentially assigned to these 30 small sectors). The data recording area Db of the large sector is formed by dividing one track into six. Therefore, as shown in FIG. 10B, the large sector recording area Db includes five data recording areas Ds for one small sector.

The data recorded in the data recording area Ds for one small sector is not the data per small sector shown in FIG. 8 but is included in the large sector recording area Db as shown in FIG. 10C. The data of the segment units of the small sectors are mixed. That is, looking at the data of five small sectors with small sector numbers “0” to “4”, for example, as shown in FIG. 10B and FIG. As shown by the oblique lines in the middle, 5 of the recording area Ds
Over the entire recording area Db of a size corresponding to the number of pieces, recording is made in one segment every five segments. Also, the data of the segment unit of the small sector with the number “1” is recorded in the segment adjacent to the data of the segment unit of the small sector with the number “0”, skipping every five segments. Similarly, numbers “2”, “3”,
The segment unit data of the small sector of "4" is sequentially recorded in the adjacent segment every five segments.

Recording can be performed in units of small sectors. When all five small sectors forming a group are recorded, the user data size is 2560 bytes and the sector size is 300 bytes.
A data structure equivalent to the data format of a large sector of 0 bytes (FIG. 9) is completed. Therefore, data access in small sector units and data access in large sector units are possible, and compatibility is achieved.

According to the above configuration, since the data is written every five segments, the burst error correction length is five times larger than in the conventional case of continuous writing, and the small sector The data reliability can be ensured even for the above data.

By the way, when the above-described recording method for compatibility between the small sector and the large sector is generalized, the small sector size A and
When compatibility is achieved between large sector sizes nA (n is an integer of 2 or more), data is recorded in i (i × n) segment i segments for every i (i is an integer of 1 or more) segment unit. It turns out that.

[0017] The above invention is not limited to the sample servo side <br/> type optical disc, if the recording medium with a segment equivalent concepts can be applied, a recording medium to the disc-shaped recording medium Not exclusively.

As described above, when the data in the small sector unit is divided into the segment units, and the data in the segment unit is spatially dispersedly recorded on the disk, one small sector unit is used. When data is recorded on the disk, the next small sector is
You have to wait for a spin.

That is, for example, in the case of the above-mentioned example, as shown in FIG.
As shown in FIG.
If one segment is recorded for each segment, the large sector recording area Db has already passed. Therefore, in order to record data in segment units of the small sector number “1”,
Until the same recording area Ds is reached,
Wait for the spin and record it. For this reason,
In order to complete a large sector, five rotations of the disk are required. For this reason, there is a drawback that data writing efficiency is low and data writing takes too much time.

In view of the above, it is an object of the present invention to provide a data recording method capable of efficiently recording data when performing recording in the above-described novel data recording mode.

[0021]

According to a first aspect of the present invention, there is provided a recording medium capable of recording unit data for a predetermined data amount for each unit recording area for a predetermined data amount. A data block serving as a unit of data access is divided into a plurality of the unit data, and the data for each of the divided unit data is written on the recording medium,
A method of spatially separating and recording each of m (m ≧ 2) unit recording areas, one for each of the m data blocks, for each of the m unit data in total Is recorded for each of the m unit recording areas spatially adjacent to the recording medium.

According to a second aspect of the present invention, a data block constituting a sector is divided into data of i times (i is an integer of 1 or more) a minimum unit that can be recorded and reproduced on a recording medium, and The data of i times the minimum unit is stored in the recording medium by n × i (n is an integer of 2 or more) of the minimum unit.
When the data is spatially separated and recorded for each multiple, the data for each n × i times of the minimum unit includes i times the minimum unit data from each of the n sectors. Thus, in units of a large sector consisting of the n sectors,
It is characterized in that data is recorded.

[0023]

In the first aspect of the present invention, a data block serving as a unit of data access, for example, a sector is divided into a plurality of unit data, and the data for each of the divided unit data is stored in a recording medium. Above, spatially separated recording is performed for each of m (m ≧ 2) unit recording areas.
Then, one unit from each of the m data blocks (sectors) is recorded for each of a total of m unit data in each of m spatially adjacent unit recording areas. Therefore, since the data of each sector is spatially separated and recorded for each unit data, it is resistant to a burst error, and, for example, when a large sector is constituted by m sectors, the large sector unit is used. Thus, efficient data recording becomes possible.

According to the second aspect of the present invention, a data block of a sector is spatially separated and recorded at every n × i times a minimum unit (eg, a segment) capable of recording and reproduction. Since the data of the unit of n × i times includes the data of i times the minimum unit from each of the n sectors, for example, a large sector is constituted by n sectors. In this case, efficient data recording can be performed in units of the large sector.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a data recording method according to the present invention will be described below with reference to the drawings. The embodiment described below is a case where the present invention is applied to a disk recording / reproducing system for recording data in the above-described novel mode proposed above.

[Explanation of Disc Recording / Reproducing System and Data Configuration] FIG. 2 is a block diagram of the overall configuration of a disc recording / reproducing system which is an example of a data recording method according to the present invention. In this example, the optical disk 1 is a rewritable optical disk, for example, a magneto-optical disk. Because of the sample servo method , this optical disc 1
The tide marks as described above are provided as pre-pits for each segment. The optical disc 1 is rotationally driven by a spindle motor 2. The spindle motor 2 receives the servo signal from the servo circuit 5 and drives the optical disc 1 to rotate at a constant angular velocity (CAV), for example.

An optical head 3 is provided on one side of the optical disc 1.
Is provided. The optical head 3 of the optical disc 1
A magnetic head 6 is provided at a position facing a surface opposite to the surface facing the magnetic head 6. The optical head 3 and the magnetic head 6 are configured to move in the radial direction of the optical disk 1 in synchronization.

The optical head 3 includes a laser light source and a photodetector. The laser light source is driven by a driving signal from a laser driving circuit 4, and the photodetector receives reflected light from the disk 1 to obtain reproduction information. The laser drive circuit 4 also controls the output power of the laser light source of the optical head 3 to generate a laser beam having a larger power during recording than during reproduction. In addition, a servo control signal from the servo circuit 5 is supplied to the optical head 3 so that focus control and tracking control are performed.

An RF signal (high-frequency signal) reproduced from the optical disk 1 by the optical head 3 is supplied to a servo circuit 5 via a head amplifier 11. The servo circuit 5 calculates the R
A focus error, a tracking error, and the like are formed from the F signal.
To form a servo control signal to be supplied to the.

A modulation / demodulation circuit 12 modulates recording data and demodulates reproduction data. A signal detection circuit such as an NRZ binary value detection circuit or a partial response ternary value detection circuit is included in a stage preceding the demodulation. Reference numeral 13 denotes a RAM for temporarily storing data for processing recorded data and reproduced data. 14 is the RAM
13 is a RAM controller that controls writing of recording data to the memory 13 and reading of reproduction data. The exchange of the recorded data and the reproduced data with other parts, for example, a personal computer, is performed by a SCSI interface in this case. Reference numeral 15 denotes a SCSI controller for the SCSI interface.

[Example of Data Structure] Next, the structure of recording / reproducing data in this system will be described. This data configuration is the same as that of FIGS. 8 and 9 described above.
That is, the user sector size is 512 bytes / 1 sector for the small sector and 2560 bytes / 1 sector for the large sector. The data format of the small sector and the large sector is as shown in FIGS. 8 and 9 described above, and the data of the large sector is divided into five small sectors in the column direction as shown in FIG. It has the same structure as the stacked one. Then, as shown in FIG.
Above, five data recording areas Ds for one small sector constitute a data recording area Db for one large sector. When writing data for one small sector to the disk 1, the data for one small sector is divided into units of one segment, and the divided data of one segment is divided into discrete segments, for example, five segments. Each segment is recorded.

FIG. 3 shows a track format in this case. The configuration of the large sector recording area Db, the recording area Ds for the small sector, and the recording area for one segment are exactly the same as those in the above-described example.

That is, as shown in FIG. 3D, the recording area for one segment includes a 4-byte servo area, a 1-byte reference area for synchronizing a reproduction clock, and a 20-byte user data area. Become. Then, as shown in FIG. 3A, one track includes data of 30 small sectors (small sector numbers “0” to “29”), and the large sector recording area Db, as shown in FIG. It consists of five data recording areas Ds for one small sector.

As shown in FIG. 3C, the data recorded in the data recording area Ds for one small sector is a mixture of segment data of five small sectors included in the large sector recording area Db. . That is, assuming that five small sectors constituting the large sector include data of five small sectors having small sector numbers “0” to “4”, for example, as shown in FIG. 3B and FIG. ”,
The 5-segment data in which the 1-segment data of each of the small sectors "1", "2", "3", and "4" are arranged in order as one set, and the 5-segment data is stored in the recording area Ds. Are recorded sequentially over the entirety of the five recording areas Db.

In this case, the data of the first five segment units of each large sector is the data of the first segment of each of the five small sectors constituting the large sector.

In the case of this example, as shown in FIG. 3, an address of a large sector immediately after this area is recorded in an area for one segment immediately before the large sector recording area Db. This address is preformatted on the disk 1 in advance. Alternatively, it is recorded when the disc 1 is formatted. Of course, this address may be written at the time of the first data recording.

As shown in FIG. 3E, the data at this address includes a 2-byte track number TNo (a number from the innermost track of the disk 1, for example) and a 1-byte sector number SNo (in the track, The number includes the number of the small sector of which number), a 3-byte parity ECC for error correction for these number data, and 14 bytes of other auxiliary data (ALPC or reference data). As the sector number SNo of the address data, the smallest number of the small sectors included in the large sector to which the address is added at the beginning is assigned. Since a large sector is formed for every five small sectors, the sector number SNo of this address data indicates the order of the large sector in one track. It should be noted that a large sector number indicating the number of a large sector in one track may be recorded as the number SNo.

Recording is performed as follows. That is,
The recording data from the SCSI interface is SCS
It is temporarily stored in the RAM 13 via the I controller 15 and the RAM controller 14. The data is read out appropriately according to an instruction from the system controller 10, supplied to the modulation / demodulation circuit 12, modulated, and supplied to the magnetic head drive circuit 16. Magnetic head drive circuit 16
Drives the magnetic head 6 so as to apply a modulation magnetic field corresponding to the recording data to the optical disk 1 and performs recording. At this time, the servo control as described above is performed, and data of one segment unit is sequentially recorded.

In reproduction, data of one segment unit is sequentially read from the disk by the sample servo method . The reproduction RF signal obtained from the optical detector of the optical head 3 is supplied to a modulation / demodulation circuit 12 through a head amplifier 11 and demodulated.
It is stored in M13. Then, the data is appropriately transferred to the reproduction data processing unit via the SCSI interface.

In this case, the recording data is not recorded in small-sector units, but in the case of recording one segment every five segments as described above, in 5-sector units (ie, large-sector units). , And temporarily store it in the RAM 13. At this time, the contents stored in the RAM 13 are as shown in FIG. In FIG. 9, in the vertical direction, data is sequentially read from the memory in the vertical direction at intervals of 4 bytes every 5 rows (for a total of 20 bytes per segment), and is successively recorded on the disk.

The reproduction data is not always taken in small sector units, but is always read in the RAM 13 in small sector units.
Then, the image is taken in such a state as shown in FIG. Then, only the data of the necessary small sector is read out from the RAM 13 and decoded.

At this time, the data to be recorded or the data to be reproduced may be less than 5 small sectors, and the recording and reproduction can be performed from an arbitrary small sector number position. A data access method for this will be described.

[Example of Data Access Method] In this example, data access in small sector units can be performed using an address given for each large sector as described below.

FIG. 4 is a flowchart of the data access in this case. That is, first, a target track number Tr and a target small sector number Se are set as addresses for a target small sector (step 101). Next, the target small sector number Se is divided by the number n of small sectors constituting the large sector (recorded at intervals of n segments; n = 5 in this example), and the quotient SE and the remainder R (R <n) )
Is obtained (step 102).

The obtained quotient SE corresponds to a large sector number. The remainder R corresponds to the number of data in segment units from the beginning of the large sector recording area Db. As described above, the data of the first n segments in the large sector recording area Db is the data of the first segment of the n small sectors included in the large sector. Is specified.

Then, the track number TNo of the address data and the target track number Tr are searched for while comparing them, and the track position of the target track number Tr is detected (step 103). Subsequently, referring to the quotient SE, the quotient S in the track of the target track number Tr is read.
The head of the large sector indicated by E is detected (step 1).
04). Next, the segment (the (R + 1) th segment since the segment number starts from "0") at the position indicated by the remainder R from the head of the recording area Db of the large sector is set to the head position of the target small sector. Recording or reproduction is started (step 105). This is the end of the access.

For example, when the instruction (track number “50”, small sector number “14”) is set as the target small sector, since n = 5, 14/5 = 2
Since the remainder is 4, first, (track number "50", large sector number "2") is searched, and recording or reproduction is started from the fifth segment from the beginning of the large sector.

[Example of data processing at the time of recording] Next, R in the case of performing data recording by accessing as described above.
The manner of writing and reading data in the AM 13 and recording on a disc will be described below. In the following description, a small sector is simply referred to as a sector for simplicity.

FIG. 1 is a flow chart of an example of the data processing at the time of recording. In this example, a file having a capacity of k sectors (k is a positive integer) is recorded from a target address.

That is, in the file recording mode,
The routine shown in FIG. 1 is entered (step 201). In step 202, the target address (Tr, Se) at which recording is started is accessed on the disk 1 as described above, and the process waits. Next, in step 203, the sector number Se of the destination address is set to mod. The operation of n is performed to convert to a sector number a (a = 0 to 4) in a large sector. Next, proceeding to step 204, it is determined whether or not the number k of sectors of the file to be recorded is larger than (na). The sector number a indicates the number of the n sectors constituting the large sector from which data recording is to be started.
a) shows how many sectors can be recorded in the first large sector recording area Db. In this step 204, the size of the number k of sectors of the file and the number of sectors that can be recorded in the first large sector recording area Db are checked.

If it is determined in step 204 that k > (na), the process proceeds to step 205, where the (na) sectors of the file data transferred via the SCSI interface are loaded into the RAM 13. , to form an (n-a) number of sectors of the lower data of the large sector of the structure shown in FIG.

Next, proceeding to step 206, the number k of sectors of the file is reduced by the number of processed sectors. Thereafter, the process proceeds to step 207, where data of (na) sectors from the bottom in FIG.
The data is sequentially read out in the vertical direction by 4 bytes every 5 rows in the vertical direction (for each segment of 20 bytes in total), and is recorded on the disk 1 from the disk position accessed in step 202. In this case, if a = 0, sets of data for every five segments described above are sequentially and sequentially recorded from the first segment of the large sector recording area Db. When a ≧ 1, no data is recorded in the first a segment of every five segments, and data is recorded in (na) segments after every five segments.

Following step 207, step 2
08 and the remaining sector number k of the file to be recorded is n
It is determined whether there is more than the number. And if k ≧ n,
The process proceeds from step 208 to step 209, in which n (= 5) sectors of the file data transferred via the SCSI interface are fetched into the RAM 13, and large sector data having the structure shown in FIG. 9 is generated. Then, the process proceeds to step 210, where the number of sectors of the file is reduced by the number of processed sectors. Then, the process returns to step 207. This time, data of n = 5 sectors is read from the RAM 13 in the vertical direction in FIG. 4 bytes every 5 lines (total 20
The data is sequentially read out in the vertical direction, and is successively recorded in the next large sector recording area Db of the disk 1.

Thereafter, the process again proceeds to step 208, where it is determined whether or not the number k of remaining sectors of the file is greater than n.
As a result of the determination, if k > n, steps 207 to 210
repeat. If it is determined in step 208 that k ≦ n, the process proceeds from step 208 to 211, where the remaining k sectors are loaded into the RAM 13, and the k sectors are k sectors from the top of the data having the large sector structure in FIG. Generate When it is determined in step 204 that k ≦ (na), the process proceeds from step 204 to step 211, and the k sector is similarly loaded into the RAM 13.

In step 212, data is recorded in the first k segments of every five segments in the next large sector recording area Db of the disk 1, and data is recorded in the subsequent (nk) segments. Not done. Thereafter, the process proceeds to step 213, and this routine ends.

[Example of Data Processing During Reproduction] Next, writing of data from the disk to the RAM 13 in the case of reproducing the file data recorded as described above will be described below. In the following description, a small sector is simply referred to as a sector for simplicity.

In this case, the reproduction data is not taken in in units of one sector, but is always stored in the RAM 1 in units of n = 5 sectors.
3 Then, only the data of the necessary sector is read out and decoded. As in the case of recording, the processing operation for reading a file having the number of sectors k will be further described with reference to FIG.

That is, in the file playback mode,
The routine shown in FIG. 5 is entered (step 301). Then, in step 302, the target address (Tr, Se) at which recording is started is accessed on the disk 1 as described above. Next, in step 303, the sector number Se of the target address is set to mod. The operation of n is performed to convert to a sector number a (a = 0 to 4) in a large sector. Next, proceeding to step 304, it is determined whether or not the number k of sectors of the file to be recorded is larger than (na). This step 3
In step 04, the size of the number k of sectors of the file and the number of sectors that can be reproduced from the access position in the large sector recording area Db are checked.

If it is determined in step 304 that k > (na), the process proceeds to step 305, where (n) behind the access position of the large sector recording area Db at the target address of the disk 1 by 5 segments is used. -A) Reproduce only the segments in sequence, sequentially take them into the RAM 13, and take (na) sectors into the RAM 13. RA
The data captured by M13 is transferred to, for example, a personal computer via a SCSI interface. The same applies hereinafter.

Next, from step 305 to step 306
, The number of sectors k of the file is reduced by the number of processed sectors, and then the process proceeds to step 307 to determine whether the number of remaining sectors k of the file is greater than n. Then, if k > n, steps 307 to 3
08, and sequentially from the next large sector recording area Db.
All segment data is reproduced, and the RAM 13
To obtain data having a data structure as shown in FIG.

Next, from step 308 to step 309
And the number k of sectors of the file is reduced by the number of processed sectors. Thereafter, the process returns to step 307. In step 307, it is determined whether or not the number k of remaining sectors of the file is greater than n. If the result of the determination is that k > n, steps 307 to 309 are repeated.

If it is determined that k ≦ n, the process proceeds from step 307 to step 310, where only the remaining k sectors are reproduced from the large sector recording area Db of the disk 1 and loaded into the RAM 13. Step 304
When it is determined that k ≦ (na), the process proceeds from step 304 to step 310, and the k sector is similarly loaded into the RAM 13. Then, step 3
Proceeding to step S11, this routine ends.

The above is an example of the case where the file data is reproduced continuously. When only one necessary small sector is read from the disk, the data is reproduced from the disk in large sector units including the small sector. Then, the data is stored in the RAM 13 and only the necessary small sectors are read from the RAM 13. In this case, what small sector of the data of 5 sectors in the RAM 13 is to be read is obtained from the remainder R in the above-described access method. That is, data of the (R + 1) th small sector from the top of the data structure of FIG.

In the reproduction flowchart of FIG. 5, the first and last data of the file data are also fetched into the RAM 13 for large sectors, and in the data configuration of FIG. 9, the first data is obtained at the time of access. From the small sectors of the rank indicated by the remainder R, only the k small sectors from the beginning are stored in the RAM 13 as the last data.
And may be transferred to a computer via a SCSI interface.

Also in the present invention, when the above method is generalized, data can be recorded in units of i (i is an integer of 1 or more) segments, so that the small sector size A
When data is exchanged between large sector sizes nA (n is an integer of 2 or more), data is recorded in the i segment of each (n × i) segment. And
In this case as well, the large sector number is identified by the division Se / n in step 102, but the access starts from the (i × R + 1) th segment counted from the beginning of the large sector.

[0066] The present invention is not limited to the sample servo scheme optical disk, a recording medium present in the segment equivalent concepts, the data block (sector) units, to record data distributed Any system can be applied. Further, the recording medium is not limited to a disk-shaped recording medium, and may be, for example, a card-shaped recording medium.

[0067]

As described above, according to the present invention, when a data block is spatially separated and recorded by a predetermined unit amount on a recording medium, the data block is spatially separated on the recording medium. Since the data to be recorded in the recording range that covers a wide range is collectively recorded, the data can be recorded without deteriorating the recording speed even in the case of distributed recording.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining one embodiment of a data recording method according to the present invention.

FIG. 2 is a block diagram of an example of a disk device on which a data recording method according to the present invention is performed.

FIG. 3 is a diagram showing a track format of a disc to which the data recording method according to the present invention is applied.

FIG. 4 is a flowchart of an example of a data access method used in the example of FIG.

FIG. 5 is a flowchart for explaining an example of a method of reproducing data recorded according to the present invention.

FIG. 6 is a diagram for explaining the sample-servo scheme.

FIG. 7 is a diagram showing an example of a recording pattern on a disc.

FIG. 8 is a diagram showing a data format of a small sector.

FIG. 9 is a diagram showing a data format of a large sector.

FIG. 10 is a diagram showing a track format on a disk according to the data recording method proposed above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magneto-optical disk 3 Optical head 6 Magnetic head 13 RAM Db Large-sector recording area Ds Small-sector data recording area As Servo area Ad Data area

Claims (4)

(57) [Claims] 1. A data block serving as a data access unit is divided into a plurality of unit data on a recording medium capable of recording the unit data of the predetermined data amount for each unit recording area of a predetermined data amount. And a method of spatially separating and recording the data for each of the divided unit data on the recording medium for each of m (m ≧ 2) unit recording areas, wherein: One from each of the data blocks,
A data recording method, wherein a total of m unit data is recorded for each of the m unit recording areas spatially adjacent to the recording medium. 2. A data block constituting a sector is divided into data of i times (i is an integer of 1 or more) a minimum unit recordable and reproducible on a recording medium, and data of i times of the minimum unit is divided. Are recorded on the recording medium in a spatially separated manner at every n × i (n is an integer of 2 or more) times the minimum unit, and the data is written at every n × i times the minimum unit. Is a data recording method in which data of i times the minimum unit from each of n sectors is included, and data is recorded in units of a large sector including the n sectors. 3. A file is divided into k (k is a positive integer) sectors, and said sectors are grouped by n (n is a positive integer) to form a large sector and recorded on a recording medium. A data recording method for converting a sector number of a target address to start recording on the recording medium into a sector number a (a is a positive integer and a <n) in the large sector. And the total number k of sectors of the file to be recorded is (na)
A second step of determining whether or not the total number of sectors k of the file to be recorded in the second step is larger than (na);
A third step of storing data of (na) sectors in the file in the memory; and subtracting the (na) sectors already stored in the memory from the total number k of sectors of the file. A fourth step of setting the calculated number of sectors as a new total number of sectors of the file; and a fifth step of reading data of the (na) sectors from the memory and recording the data on the recording medium. Determining whether the new total number of sectors of the file determined in the fourth step is greater than n.
And if the new total number of sectors of the file obtained in the fourth step is larger than n, recording the sectors of the new total number of sectors on the recording medium every n sectors. 7. A data recording method, comprising: 4. A file is divided into k (k is a positive integer) sectors, and said sectors are grouped by n (n is a positive integer) to form a large sector and recorded on a recording medium. A data reproduction method for reproducing the file, wherein a sector number of a target address for starting reproduction on the recording medium is set to a sector number a (a is a positive integer and a <n) in the large sector. And the total number of sectors k of the file to be reproduced is (na)
A second step of determining whether or not the total number of sectors k of the file to be reproduced in the second step is larger than (na);
A third step of reading from the recording medium for (na) sectors of the file and storing the same in the memory; and calculating the (na) number of sectors already stored in the memory from the total number k of sectors of the file. A fourth step in which the number of sectors obtained by subtracting the number of sectors is set as a new total number of sectors in the file; and whether the new total number of sectors in the file obtained in the fourth step is larger than n. Fifth to determine
And if the new total number of sectors of the file obtained in the fourth step is larger than the n, read the sector of the new total number of sectors from the recording medium for every n sectors and reproduce it. A data reproducing method, comprising: a sixth step of: