JP3456210B2 - Data recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
An optical disk that records data on an optical (magneto-optical) disk
The present invention relates to a disk data recording method. [0002] 2. Description of the Related Art In recent years, read-only optical discs (ROM discs) have been developed.
Not only discs but also optical discs that can be recorded and reproduced
Data storage, music use, etc.
You. As a recordable optical disk, a light-sensitive recording medium
Magneto-optical disk with body as recording surface can be overwritten
And is considered the most useful. [0003] Also, optical discs and these optical discs are used.
Laser beam on a spiral or concentric track
Irradiates the system to record various data on the optical disc,
Optical disc system that can read recorded data
System, the track on which the data is arranged
And a continuous method composed of
A sample sampler in which tracks to be arranged are discretely arranged
-The sample servo system formed by the pits
Is widely known. FIG. 7 shows that a recording track has a sample servo pitch.
Disk format when formed by
This is an example of an₁ ~ S₄₂Is, for example, the circumference
A sector divided into 42 in the direction is shown. FIG. 8 shows a track in each sector unit.
(A) As shown in FIG.
Rear and ALPC area (Automatic Laser Power Control A
rea)₁ And the trial writing area
Header segment H used for _Two Address consisting of
A test area AD is provided.
The data recording area DB where the data of the
Segment SG₁ ~ SG₃₀Is divided into
You. FIG. 8B shows a header segment H₁ , H
_Two And data segment SG₁ ~ SG₃₀To further expand
First, the servo byte SB is located,
Subsequently, an address or magneto-optical (MO) data is recorded.
A rear is provided. [0007] The servo byte SB has at least a track.
A pair of pairs deviated from the center of T to the outer peripheral side and the inner peripheral side
Wobbling pit P₁ , P_Two And the center of the track T
Clock pit P located on the line_Three But in advance
It is formed by embossing or the like. Also, the wobbling pit P₁ , P_Two And
Lock pit P_Three Of the mirror surface M, this mirror
-Focus laser by laser light reflected from surface M
Signal is detected and the laser power is controlled.
Can also be done. In addition, the track information
Pit P where access code forms gray code_Four , P
_Five Recorded by [0009] Such a magneto-optical disk is usually a warp disk.
Bring pit P₁ , P_Two At the sampling point t₁ , T_Two Inspection
Trackin by calculating the reflected light when emitted
Error signal is generated and the clock pit P_Three The sump
Le point t_Three The clock signal is formed by the signal detected at
It is. This magneto-optical disk has a data byte DB.
In the area of the area A along the track T
Irradiates a laser beam on the recording surface of the
When a magnetic field is applied from the other side of the disc, the recording
Magnetic field in the direction of the applied magnetic field
And the data is recorded. For example, one data segment
Mention (SG₁ ~ SG₃₀) 20 bytes in the data byte DB
Is recorded (data of one data group unit).
If the data length is 20 bytes), as shown in FIG.
Is formed. Note that D_i (I = 0,1,2 ...) are respectively
Indicates 1-byte data. Also, like this, each segment
SG₁ ~ SG₃₀Has a record of 20 bytes each
And a total of 600 bytes of data in one sector
If data is recorded, for example, data 520 bytes
(Including control data) followed by ECC (Er
ror Correction Code) is recorded in 80 bytes. Magneto-optical recording of data
When reading information from the disc, the laser beam
By detecting the emitted light using the magnetic force effect,
The data recorded in the data byte DB is read
You. Then, read from the recording track as shown in FIG.
The stored data is stored in the data memory as shown in FIG.
For example, it should be arranged with an interleave factor = 5.
5 units as error correction processing unit for 1 sector
Error correction line L₁~ L_Five Is formed, and each error correction line is
L₁ ~ L_Five Error correction processing is performed every time.
As shown, 520 bytes of data (data D
₀ ~ D₅₁₁ , Control data P₁ ~ P_Four , CRCC
Data CRC₁ ~ CRC_Four ) Followed by each error correction line.
L₁ ~ L_Five Each have a 16-byte ECC (E1₁~ E
1₁₆ , E2₁~ E2₁₆ , E3₁~ E3₁₆ , E4₁~ E4₁₆ , E
Five₁~ E5₁₆ ) Are arranged and subjected to error correction. [0013] By the way, the above-mentioned light
For magnetic disks, etc., physical properties such as kinking and birefringence during molding
Pits, for example, due to embossing
Data recorded around the formed servo byte SB
Recorded at a position relatively far from the servo byte SB.
Error is more likely to occur during playback than
There are times. That is, in the example of FIG.
The first byte and the last byte of the data byte DB adjacent to the
The last byte, D₀ , D₁₉, D₂₀, D₃₉, D₄₀...
 And the likelihood of a read error occurring in other data (eg,
D₁ ~ D₁₈, D_{twenty one}~ D₃₈Etc.). At the time of data reproduction, as shown in FIG.
Error correction processing arranged with interleave factor = 5
Is considered, the beginning of each data segment
Data D₀ , D₂₀, D₄₀... are all error correction
L₁ Data at the top and at the end of each segment
D₁₉, D₃₉, D₅₉... are all error correction lines L_Fiveabove
And therefore the error correction line L₁ as well as
L_Five Is the other error correction line L_Two~ L_Four Processing negative compared to
The burden is likely to be excessive, that is, the probability of occurrence of uncorrectable is high
There is a problem that becomes. For example, one error correction line is 8 bytes
Each data segment due to physical influences.
Mento SG₀ ~ SG₂₉Error in the first data in
Error correction line L₁ To 30
Byte errors are concentrated and the error correction line L₁ Is uncorrectable
It works. As described above, the correction by one error correction line is performed.
If an error occurs, other error correction lines can be corrected.
Even if it is, the whole sector will be defective reproduction
Errors that have a high probability of being uncorrectable
The presence of correction lines must be prevented.
No. [0018] The present invention addresses such problems.
In light of this, each error correction line
The processing load is evenly distributed, especially the probability of uncorrectable
To avoid generating high error correction lines.
You. For this reason, a track is composed of a plurality of sectors.
Is divided circumferentially into each sectorForRicin
Signal, followed by a data area of n data units.
Data segments with multipleRecordedToDid
A data recording method for an optical disc, comprising:
Error correction line, and this m or m
Divisor aboveBetween resync signalsDivide the number of data units n
Set the data stream to a value that is
Allocated sequentially to the error correction line for each data unit
Data segment within the above sector
A data group of the corresponding data unit number n is constructed, and this data
The group is sequentially recorded on the optical disc.
A data recording method is provided. The data length n of one data group unit and the data length n
N / m or (n / (approximately
Number)) so that the format of the optical disc is
Or on interleave control operation, or both
By setting, for example, continuous in one sector
A predetermined number of data group units (that is, a predetermined number of consecutive segments
G) Comrades use data memos for error correction
Each data area on the disk as a data array on the
The data recorded at the corresponding position in the
Data array that is not processed by That is, the data provided for the error correction operation
Data array formed on the data memory is a predetermined number of data groups
Each data group will be shifted
The first byte or each last byte is collected on a specific error correction line.
It will not be inside. [0022] DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an optical disk according to the present invention.
Shows a schematic diagram of an optical disk system to which the recording method is applied.
1 is a magneto-optical disk, and this magneto-optical disk
The disk 1 is loaded into the optical head device 2 to record data.
/ Reproduction operation is executed. The magneto-optical disk 1 is, for example, shown in FIGS.
Track format of sample servo method like
It has been done. That is, one track is 56 minutes in the circumferential direction.
Cracked sector S₁ ~ S₅₆Is formed, and each sector S
₁ ~ S₅₆Indicates address data and the like as shown in FIG.
Header segment HS to be recorded and 23-segment data segment
Mento SG₁ ~ SG_{twenty three}Composed of Header segment HS and data segment
SG₁ ~ SG_{twenty three}First, as shown in FIG.
Byte SB is arranged, followed by address and magneto-optical
(MO) Area where data is recorded (data byte D
B) is provided. In addition, the servo byte SB
1 that is deviated from the center of the
Pair of wobbling pits P₁ , P_Two And of track T
Clock pit P located on the center line_Three Provided
It is. Also, the wobbling pit P₁ , P_Two And the clock
Cuppit P_Three Is a mirror surface M. In addition,
Pit P where access code forms gray code_Four , P
_Five Recorded by Here, each of the magneto-optical disks 1
Data segment SG₁ ~ SG_{twenty three}Data bytes in
26 bytes of data are recorded in DB
Is set to Therefore, the recording capacity in one sector is
598 bytes, for example, 512 bytes of user data
80 bytes of ECC data and 4 bytes of CRCC data
And two bytes of control data are recorded. The optical head unit 2 includes a magneto-optical disk
1 is constant linear velocity (CLV) or constant angular velocity (CA
V) spindle motor
To the magneto-optical disk 1
To irradiate a laser beam when recording or reproducing
Head 2b is located below the loaded magneto-optical disk 1.
Are arranged as follows. In addition, the optical disk 1
Magnetic head 2c is provided at a position facing the magnetic head 3.
When data is recorded on the magneto-optical disk 1, the recorded data
To apply a reversing magnetic field.
You. With respect to such a magneto-optical disk 1, FIG.
Optical head mounted on optical head unit 2 in 1
2b is the laser emission source, collimation
Control lens, beam splitter and objective lens
Optical system consisting of two-axis devices
Polarizing beam splitter to detect reflected light from magnetic disk
Detector and detector. In particular, reflected light is polarized
Split into P and S deflection components by the beam splitter
And be detected by two detectors
Have been. In the optical head device 2,
Supplies the outputs of the two detectors to a differential amplifier,
By taking the difference between both outputs with a differential amplifier,
The reproduction signal of the recorded data is extracted. Also, the header
Molding HS or servo tool SB
Use the output signal obtained from the detector when scanning the
To form various servo signals and supply them to the servo circuit.
Drive the two-axis device, and perform tracking servo and
And focus servo, and master clock signal
Number, address information and the like. 3 stores data to be recorded, and
The recording data is supplied to the recording device unit 2 as recording data, and
The data reproduced by the head unit 2 is stored.
Data memory 4 is for processing recorded data and reproduced data
A controller (CPU) 5 that performs such control is a data controller.
An ECC circuit section 6 for performing data correction processing is, for example, not shown.
Record and playback data with the host computer
1 shows an interface unit for exchanging data. Data in such an optical disk system
The operation at the time of data recording is, for example, the host computer
To the magneto-optical disk 1 via the interface unit 6
Data to be recorded (for example, 512 bytes per sector)
G) is held in the data memory 3. Further control
Control data (2 bytes) is generated in LA4
The data is stored in the data memory 3 and further stored in the ECC circuit section.
5, CRCC data (4 bytes), ECC data
(80 bytes) is generated and written to the data memory 3.
Be included. For example, as shown in FIG.
Such a data stream, ie, data D₀ ~ D₅₁₁ , Con
Troll data P₁ , P_Two , CRCC data CRC₁ ~
CRC_Four , ECC data E1₁~ E5₁₆ Data list by
A ream is formed. In FIG. 4, the solid frame is light.
26 corresponding to one data segment on the magnetic disk 1
This shows a byte data group. These data are shown in FIG.
Are stored in the data memory 3 as shown in FIG.
Here, in the data memory 3, for example, the first two bytes
Indicates dummy fixed data (such as "00" or "FF")
I try to remember. The data held in the data memory 3
(D₀ ~ D₅₁₁ , P₁ , P_Two , CRC ₁ ~ CRC_Four , E
1₁~ E5₁₆ ) Are in the order shown in the data stream of FIG.
The data is read out and supplied to the optical head device unit 2, and 26 bytes
Each data set on the magneto-optical disk 1 is
Gmento SG₁ ~ SG_{twenty three}Field modulation on data byte DB
It is recorded by the method. Therefore, the magneto-optical disk 1
As shown in FIG. 6, each data segment SG₁ ~ SG_{twenty three}To
The data is recorded. For example, the beginning of each data byte DB
If you give the data, D₀ , D₂₆, D₅₂...
You. This magneto-optically recorded data is reproduced again.
At the time of birth, the optical head 1
Is reproduced from the data memory 3 as shown in FIG.
I will be absorbed. Here, 598 bytes are stored in the data memory 3.
The data of each site are arranged with an interleave factor = 5.
Therefore, the ECC circuit unit 5
Error correction line L for the data written in₁
~ L_Five 16 bytes of E allocated in units of
CC data (E1₁~ E1₁₆ , E2₁~ E2₁₆ , E3₁~ E3
₁₆ , E4₁~ E4₁₆ , E5₁~ E5₁₆ ) For error detection
And a correction processing operation. Error-corrected data
D₀ ~ D₅₁₁ Through the interface unit 6
To be supplied as playback data to the
Become. Here, each data is recorded on the magneto-optical disk 1.
First byte in data byte DB of data segment
Data D recorded as₀ , D₂₆, D₅₂...
Attention is paid to the data D as shown by the hatched lines in FIG.
₀ Is L_Three On line, D₂₆Is L _Four On line, D₅₂Is L_Five La
On the different error correction lines
It will be arranged in. On the magneto-optical disk 1
Is recorded as the last byte of each data byte DB
Data D_{twenty five}, D₅₁, ‥‥). That is, in this embodiment, one data segment
A magneto-optical disc in which 26 bytes of data are recorded
5 interleave factors = 5
Error processing with error correction lines
And the head in the data byte DB with the highest error probability
Byte or last byte equally on 5 error correction lines
Error correction processing
Error correction line, which particularly increases the error processing load.
This can be eliminated. That is, the storage capacity of the data byte DB (2
6 bytes) for the interleave factor (= 5)
Because the value is set to an indivisible number,
During data read, each data
Data at the corresponding position between sites naturally corrects each error
Will be assigned to the line. Of course, this place
No special hardware is required for
Address generator for read / write operation of data memory 30
Control the position and change the interleave position, etc.
No processing is required. Note that, in the present invention, one such
And interleave storage capacity (n) of data byte DB
Assuming a factor (m), n ÷ m or n ÷ (m
Divisor) is set to an indivisible value.
Therefore, as described above, each error correction line has an error.
-The processing load can be equalized, but
To do this, for a particular interleave factor,
Identification realized by setting the format of the optical disk
Interleave file format
Optical disk format and
And interleave factor are newly set for each
Three ways of thinking. By the way, the above embodiment is a sample server.
Recording on optical discs that use the recording format
/ Playback operation was described as an example,
Recording / playback for composite servo type optical discs
The present invention is also effectively applied to a raw operation. For a continuous composite servo system
In this case, a resync signal is recorded in the data area,
To resynchronize the PLL circuit,
Data errors are prevented from spreading. Follow
The data immediately after the resync signal has a relatively high error rate.
Is small, but the closer to the data just before resync, the more error occurs
Is likely to increase. Therefore, the resync signal
Signal between the signal and the resync signal,
One data group like data segment data
To the data length n of this data group unit,
The turile factor m or this divisor is indivisible
To achieve a similar effect.
Can be. The present invention is not limited to the above embodiment.
Not within the scope of the gist.
Various setting changes should be made. Of course de
Data length n and interleave factor m
It is not limited to the above numerical values. [0041] As described above, the optical disk of the present invention
The data recording method of
An optical disk in which the data length of each data group is set to n
Interleave factor m or a divisor of m
Is indivisible to the data length n,
Data length n and / or interleave length m are set
On the data memory provided for error correction operation
The data array formed in each of the predetermined number of data groups
Each data segment on the optical disc
Data that is the first byte or last byte
Will not be concentrated on the correction line. Thus, the error on a specific error correction line
The number of data with high error probability will not be concentrated,
Therefore, an error correction line has an excessive correction burden.
The probability of being uncorrectable is much lower. That is, correction
Ineffectiveness is effectively prevented, and correctability in sector units
There is an effect that the power can be improved. Only
Even special hardware to perform such processing
There is also an advantage that it is not necessary to add.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an optical disk system to which a recording method of the present invention is applied. FIG. 2 is an explanatory diagram showing a format of a magneto-optical disk according to an embodiment. FIG. 3 is a detailed explanatory diagram of a recording track according to the embodiment. FIG. 4 is an explanatory diagram of a data stream for a data memory according to an embodiment. FIG. 5 is an explanatory diagram of a data holding state of the data memory according to the embodiment; FIG. 6 is an explanatory diagram of a data recording state of a recording track of the magneto-optical disk of the embodiment. FIG. 7 is an explanatory diagram showing a format of a magneto-optical disk. FIG. 8 is a detailed explanatory diagram of a recording track. FIG. 9 is an explanatory diagram of data on a recording track. FIG. 10 is an explanatory diagram of a data holding state of a reproduction signal from a magneto-optical disk in a data memory. [Description of Signs] 1 magneto-optical disk 2 optical head unit 3 data memory 4 controller 5 ECC circuit unit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 20/12 G11B 7/007 G11B 20/18

Claims (1)

(57) [Claim 1] A track is divided in a circumferential direction by a plurality of sectors , and a resync signal and
A data recording method for an optical disc data segment and a data area of the number of data units n subsequent thereto is to Ru is more recorded, as well as providing a m number of error correction line, the m,
Alternatively, by setting the divisor of m to a value that is not divisible by the number n of data units between the resync signals, and sequentially allocating the recorded data stream to the error correction line for each data unit, the data in the sector A data recording method, comprising forming a data group of a data unit number n corresponding to a segment, and sequentially recording the data group on the optical disc.