JPH06259886A - Magneto-optical disk and recording and reproducing device for magneto-optical disk - Google Patents

Abstract

PURPOSE:To obtain a recording and reproducing device for a magneto-optical disk which can rapidly control cluster including a defective region of a magneto- optical disk and can improve an error rate without requiring controlling a defective region of a magneto-optical disk at a host side. CONSTITUTION:Defective control data reproduced from a read in region of a magneto-optical disk 2 is stored in a buffer memory 14. A cluster including a defective region is controlled by a system controller 9 based on this defective control data, each cluster other than clusters including the above mentioned defective region is accessed, and access control for recording and reproducing recorded data which is made a cluster with one cluster unit is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk on which clustered recording data is recorded in units of one cluster, and a magneto-optical disk recording / reproducing for recording / reproducing recording data on / from this magneto-optical disk. It relates to the device.

[0002]

2. Description of the Related Art In a magneto-optical disk on which data subjected to interleave processing is recorded, clustered data is recorded in units of one cluster in consideration of data rewriting. That is, in a magneto-optical disk on which data subjected to interleave processing is recorded, data does not exist independently in each sector but data is recorded over a plurality of sectors. Only the rewriting cannot be performed by one operation, and the rewriting is performed in cluster units.

[0003]

By the way, in a magneto-optical disk recording / reproducing apparatus which clusters data on a magneto-optical disk and records / reproduces in units of one cluster, when recording is performed sequentially like music data. When there is a cluster including a defect (defect) in the recording area, the cluster is shifted as it is, so that the defect cluster can be easily skipped at the time of the next recording / reproduction.

However, when handling computer data, writing is not always performed sequentially from the beginning of the cluster, and the writing location changes randomly. Further, since a random access disk for a computer normally handles each data in block units, there is a one-to-one correspondence between write / read locations and block addresses, and it is only necessary to shift the write location later like music data. Not that. For this reason, it is too late to know whether it is a defect when writing data.

Therefore, in view of the conventional problems as described above,
It is an object of the present invention to provide a magneto-optical disk capable of providing a recording / reproducing system with defect management data indicating a defective area in a recording area in cluster units.

Another object of the present invention is to enable rapid management of a cluster including a defective area of a magneto-optical disk, without the need for management of the defective area of the magneto-optical disk on the host side, and to make an error. An object of the present invention is to provide a magneto-optical disk recording / reproducing device capable of improving the rate.

[0007]

In order to solve the above problems, the present invention provides a magneto-optical disk in which clustered recording data is recorded in a unit of a cluster, and a defective area in a recording area is formed in a unit of a cluster. It has a lead-in area for recording the defect management data shown.

Further, the magneto-optical disk according to the present invention is 1
The cluster is characterized in that the link sector is composed of 3 sectors, the sub data sector is composed of 1 sector, and the data sector is composed of 32 sectors, ie, 36 sectors.

Further, in the magneto-optical disk recording / reproducing apparatus according to the present invention, the recording data obtained by clustering the magneto-optical disk having the lead-in area for recording the defect management data indicating the defective area in the recording area in units of clusters. A recording / reproducing apparatus for recording / reproducing data in units of one cluster, wherein a cluster including the defective area is managed based on the defect management data reproduced from the lead-in area of the magneto-optical disk, A feature is provided that has a access control means for accessing each cluster except the cluster including the defective area, and accesses each cluster excluding the cluster including the defective area to record and reproduce the clustered record data in units of one cluster. It is what

[0010]

In the magneto-optical disk according to the present invention, defect management data indicating a defective area in the recording area in cluster units is held in the lead-in area.

Further, in the magneto-optical disk recording / reproducing apparatus according to the present invention, the success control means manages the cluster including the defective area on the basis of the defect management data reproduced from the lead-in area of the magneto-optical disk. Each cluster except the cluster including the defective area is accessed to record / reproduce the clustered recording data in units of one cluster.

[0012]

Embodiments of a magneto-optical disk and a magneto-optical disk recording / reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the schematic arrangement of a magneto-optical disk recording / reproducing apparatus according to the present invention.

The magneto-optical disk recording / reproducing apparatus shown in FIG. 1 records / reproduces data on / from a magneto-optical disk 2 which is rotationally driven by a spindle motor 1 at a constant linear velocity. as a magneto-optical disk 2 having the recording and reproduction area a ₂₀ provided outside the read-only area a ₁₀ Toko playback only area a ₁₀ is rotated at a constant linear velocity by the spindle motor 1 as shown in Has become.

A read-only area A ₁₀ of the magneto-optical disk 2.
Has a data area A ₁₁ in which program data such as music data and computer data is recorded, and a lead-in area A ₁₂ provided on the inner peripheral side thereof. Digital data “1” and “0” are stored in the reproduction-only area A _10.
Is recorded in advance as the presence or absence of a pit corresponding to. The lead-in area A ₁₂ has the data area A ₁₁
(TOC: Table of Con
As tents) data, recording start address data and recording end address data are recorded in order for all program data.

The recording / reproducing area A ₂₀ of the magneto-optical disk 2 is a data area A _{21 in} which program data such as music data and computer data is recorded, and a lead-in area A ₂₂ provided on the inner peripheral side thereof. And have. This recording / reproducing area A ₂₀ is a magneto-optical recording medium area. Then, the recording / reproducing area A ₂₀ of the magneto-optical disk 2 is
A recording track is formed along the groove (tracking guide groove), and a CLV control sine wave signal is recorded as a wobbling signal by wobbling the groove. Address data is superimposed by performing frequency modulation on the CLV controlling sine wave signal.

In the lead-in area A ₂₂ , defect management data, which will be described later, is recorded as TOC data indicating the recording position and recording content of the data recorded in the data area A ₂₁ , and each data area is recorded. Track number data indicating a series of data recorded on the disk and address data indicating the position of each data area are recorded.

That is, the magneto-optical disk 2 is subjected to a formatting process according to the procedure shown in the flowchart of FIG. 3 at the time of its production, so that the defect management data is recorded in the lead-in area A ₂₂ .

In this formatting process, first, "00" data is written in all the cluster sector areas of the recording / reproducing area A ₂₀ (step 1). Then, if the writing of "00" data fails even if a retry is executed several times when writing data, the cluster is registered as a defect (defect) area (step 2). Next, if all the cluster sector areas of the recording / reproducing area A _{20 in} which the “00” data has been written are read and the reading of the “00” data fails even after several retries, a defect (defect). The cluster is registered as an area (step 3). Then, defect management data indicating all defect (defect) areas found in this way in units of custaster is written in the lead-in area A ₂₂ of the recording / reproducing area A ₂₀ .

Here, for example, as shown in FIG. 4, physical clusters [50] and [5] are used as clusters including defective areas.
5] and [100] are registered, as shown in FIG. 5, sector 0 of the lead-in area A ₂₂ of the recording / reproducing area A ₂₀ is recorded.
Include clusters [50], [5 including the defect area
5] and [100] start address data and end address data are recorded. The start address data and the end address data are in the upper 14
The bit indicates a cluster, the next 6 bits indicate a sector, and the lower 4 bits indicate a sound group. And
The logical cluster actually accessed to the physical cluster is the cluster [50], [55] including the defective area.
6, the physical clusters to be accessed are, for example, [50] and [5].
5], two clusters are shifted to 72 clusters [7
2].

In the magneto-optical disk recording / reproducing apparatus of this embodiment, the magneto-optical disk 2 rotated by the spindle motor 1 at a constant linear velocity is converted into data by irradiating laser light from the optical pickup 3, for example. By applying a corresponding modulation magnetic field by the magnetic head 4, data recording (so-called magnetic field modulation recording) is performed along the recording track of the recording / reproducing area A ₂₀ of the magneto-optical disk 2, and the magneto-optical disk. Data is optically reproduced by tracing the recording tracks of the reproduction-only area A ₁₀ and the recording / reproduction area A ₂₀ of 2 with the laser beam by the optical pickup 3, and the magnetic head for driving the magnetic head 4. The drive circuit 5, the RF circuit 6 to which the reproduction output obtained by the optical pickup 3 is supplied, the address circuit Provided with a like over da 7 and the servo control circuit 8, the system controller 9 for controlling the entire system, the optical pickup 3 and the magnetic head 4
Sled motor 10 for moving a disc, encoder / decoder 1 for performing conversion processing corresponding to the disc format
1. AD / DA converter 12 for inputting / outputting audio signals, compression / expansion processing unit 13 for compressing / expanding audio data, buffer memory 14 for temporarily storing audio data, input / output of computer data A buffer memory 15 for performing error correction and an encoder / decoder 1 for performing error correction processing on computer data
6 and so on.

The optical pickup 3 has the magneto-optical disc.
Recording / playback area A of disk 2₂₀When recording data to
In addition, the magnetic head 4 is driven by the head drive circuit 5.
The above-mentioned magneto-optical device is applied with a modulation magnetic field according to the recorded data.
Irradiating the target track of the air disk 2 with laser light.
The data is recorded by thermomagnetic recording. Also,
This optical pickup 3 is used to irradiate a target track.
By detecting the reflected light of the laser light, for example, so-called astigmatism
Focus error is detected by the aberration method.
The tracking error is detected by the 3-beam method. Furthermore
In addition, the optical pickup 3 includes the magneto-optical disk 2 described above.
Playback area A_TenWhen playing back data from
Detect the change in the amount of reflected light from the target track
The reproduced signal obtained by the above is output. Also, above
Recording / reproducing area A of the magneto-optical disk 2 ₂₀Play data from
Of the reflected light from the target track of the laser light
Obtained by detecting the difference in polarization angle (Kerr rotation angle)
Output the playback signal.

The output of the optical pickup 3 is supplied to the RF circuit 6 as shown in FIG. This RF circuit 6
The focus error signal and the tracking error signal are extracted from the output of the optical pickup 3 and supplied to the servo control circuit 6, and the reproduction signal is binarized and supplied to the address decoder 6 and the encoder / decoder 7.

The servo control circuit 6 is composed of, for example, a focus servo control circuit, a tracking servo control circuit, a spindle motor servo control circuit, a sled servo control circuit, and the like. The focus servo control circuit controls the focus of the optical system of the optical pickup 3 so that the focus error signal becomes zero.
Further, the tracking servo control circuit controls the tracking of the optical system of the optical pickup 3 so that the tracking error signal becomes zero. Further, the spindle motor servo control circuit controls the spindle motor 1 so as to rotate and drive the magneto-optical disk 2 at a predetermined constant linear velocity. Further, the sled servo control circuit controls the sled motor 10 to move the optical pickup 3 and the magnetic head 4 to a target track position of the magneto-optical disk 2 designated by the system controller 9. The servo control circuit 8 that performs such various control operations supplies the system controller 9 with data indicating the operating state of each unit controlled by the servo control circuit 8.

The system controller 9 controls the operation in a key input operation section (not shown) or in a write mode or a read mode designated by control input information supplied from an external host. The system controller 9 also records a recording position on the recording track traced by the optical pickup 3 and the magnetic head 4 based on address information in sector units reproduced from the recording track of the magneto-optical disk 2. Manage the playback position. The system controller 9 controls the read-in area A ₁₀ of the read-only area A ₁₀ of the magneto-optical disk 2.
_The TOC data read from ₁₂ is stored in the buffer memory 14, and the reproduction position of the data area A ₁₁ of the reproduction-only area A ₁₀ is managed based on this TOC data.
Further, the system controller 9 stores the defect management data read from the lead-in area A ₂₂ of the recording / reproducing area A ₂₀ of the magneto-optical disk 2 in the buffer memory 14
The cluster including the defective area is managed based on the defect management data, access control is performed to access each cluster except the cluster including the defective area, and the clustered recording is performed. The recording position and reproducing position of the recording / reproducing area A ₂₀ with respect to the data area A ₂₁ are managed so that the data is recorded / reproduced in units of one cluster.

In the audio signal recording system in this magneto-optical disk recording / reproducing apparatus, the input audio signal is quantized by the AD / DA converter 12 and 2 ch × 1.
Digital audio data having a data rate of 6 bits × 44.1 kHz≈1.4 Mbit / s is formed. This A
The digital audio data obtained by the D / DA converter 12 is supplied to the compression / expansion processor 13.

The compression / decompression processing unit 13 quantizes the input audio signal by the AD / DA conversion unit 12 and digital audio data having a data rate of 1.4 Mbit / s is a block of data of about 20 ms at maximum. As a result, the waveform on the time axis is analyzed into approximately 1,000 components on the frequency axis by so-called orthogonal transformation, and the frequency components that are important for hearing are sequentially extracted to generate digital audio data having a data rate of 300 kbit / s. That is, an ATR that compresses the digital audio data having the data rate of 1.4 M bit / s into the digital audio data having the data rate of 1/5 300 k bit / s.
AC (Adaptive Transform Acoustic Coding) encoding processing is performed. This converts the data transfer rate from 75 sectors / sec in the standard CD-DA format to 15 sectors / sec.

Next, in the buffer memory 14, the writing and reading of data are controlled by the system controller 9, and the compressed audio data supplied from the compression / expansion processing unit 13 is temporarily stored, and if necessary. Accordingly, it is used as a buffer memory for recording on the disc. That is, the compressed audio data supplied from the compression / expansion processing unit 13 has its data transfer rate reduced to 1/5 of the standard data transfer rate of 75 sectors / second, that is, 15 sectors / second. The compressed data is continuously written in the buffer memory 14. This compressed data is 1 for every 5 sectors
Although it suffices to record the sectors, it is practically impossible to record every 5 sectors like this. Therefore, continuous sector recording as described later is performed. In this recording, a cluster consisting of a predetermined plurality of sectors (for example, 32 sectors + several sectors) is used as a recording unit for 75 recordings during the rest period.
It is performed in bursts at a data transfer rate of sectors / second.
That is, in the buffer memory 14, the compressed audio data continuously written at a low transfer rate of 15 (= 75/5) sectors / second corresponding to the bit compression rate is recorded as the recording data of 75 sectors / second. It is read in bursts at the transfer rate. The overall data transfer rate of the read and recorded data, including the recording pause period, is as low as the above-mentioned 15 sectors / second, but within the time of the burst recording operation. The instantaneous data transfer rate is 75 sectors / sec.

Compressed audio data, that is, recording data, which is burst-read from the buffer memory 14 at the transfer rate of 75 sectors / second is supplied to the encoder / decoder 11. Here, the buffer memory 1
In the data string supplied from 4 to the encoder / decoder 11, the unit to be continuously recorded in one recording is a cluster composed of a plurality of sectors (for example, 32 sectors) and a cluster connection arranged before and after the cluster. It is set to several sectors. This cluster connection sector is an encoder /
It is set longer than the interleave length in the decoder 11 so that interleaved data will not affect the data in other clusters.

That is, this magneto-optical disk recording / reproducing device
Recording data (read from the buffer memory 14)
Data) is a fixed number of sectors (or block
Cluster) and clusters between these clusters.
It is in the form that several sectors for star connection are arranged
There is. Specifically, as shown in FIG. 7, the cluster C has 32
Sectors (blocks) B0 to B31 and one sub-code
Dosector S and 3 sectors for connection (linking) L1
~ L3 consisting of 36 sectors in total, the linking sector
It is connected to the adjacent cluster via L1 to L3. This
Here, one cluster, for example, the kth cluster C_kNote
When recording, this cluster C_k32 sectors of B
0-B31 and not only one subcode sector S,
Cluster C _k-12 sectors on the side L2, L3 (run-a
Block) and cluster C_{k + 1}One side sector L1
36 sectors including (run-out block)
I record it as a unit. At this time, this
36 sectors of recorded data are recorded in the buffer memory 1
4 to encoder / decoder 11
Interleave processing is performed by the decoder / decoder 11.
Depending on, a maximum of 108 frames (approx.
The distance is rearranged, but the cluster C_k
For the data in the run-in block L2,
Sufficient within the range from L3 to run-out block L1
Other cluster C_k-1And C_{k + 1}Affect
It has no effect. In addition, linking sectors L1 to L
Damy data such as 0 is arranged in 3, and
The adverse effect of the interleave processing on the original data
It can be avoided.

By performing such recording in cluster units, it is not necessary to consider mutual interference due to interleaving with other clusters, and data processing is greatly simplified. Also, if the recording data could not be recorded normally during recording due to defocusing, tracking deviation, or other malfunctions, re-recording can be performed in cluster units, and if effective data reading cannot be performed during playback, Re-reading can be performed in cluster units.

The encoder / decoder 11 performs coding processing (parity addition and interleave processing) for error correction and EFM on the recording data supplied in bursts from the buffer memory 14 as described above.
Encoding processing is performed. This encoder / decoder 11
The recording data that has been subjected to the encoding process according to (4) is supplied to the magnetic head drive circuit 5. The magnetic head drive circuit 5 is connected to the magnetic head 4 and drives the magnetic head 4 so as to apply a modulation magnetic field according to the recording data to the magneto-optical disk 2.

The system controller 9 controls the buffer memory 14 as described above and records the recording data burst read from the buffer memory 14 on the magneto-optical disk 2 by the memory control. The recording position is controlled so as to continuously record on the track. The control of the recording position manages the recording position of the recording data which is burst-read from the buffer memory 14 by the system controller 9 and designates the recording position on the recording track of the magneto-optical disk 2. Is supplied to the servo control circuit 8.

That is, in this magneto-optical disc recording / reproducing apparatus, the AD / DA converting section 12 is used in the recording mode.
As described above, the digital audio data obtained from the sampling frequency is 44.1 kHz and the quantization bit number is 1
It is audio PCM data of 6 bits and a data transfer rate of 75 sectors / second. This is sent to the compression / expansion processing unit 13 and is output as compressed audio data of 15 sectors / sec with a data transfer rate of ⅕. This compression /
Compressed audio data continuously output from the decompression processing unit 13 at a transfer rate of 15 sectors / second is supplied to the buffer memory 14.

Then, the system controller 9 is
By continuously incrementing the write pointer of the buffer memory 14 at a transfer rate of 15 sectors / second, the compressed audio data is continuously written to the buffer memory 14 at a transfer rate of 15 sectors / second. When the data amount of the compressed audio data stored in the buffer memory 14 exceeds a predetermined amount, the read pointer R of the buffer memory 14 is incremented in a burst manner at a transfer rate of 75 sectors / second, and the buffer memory 14 stores the data in the buffer memory 14. Memory control is performed so that the compressed audio data is read as a recording data in a burst at a transfer rate of 75 sectors / sec.

By the memory control by the system controller 9 as described above, the compression / expansion processing unit 1
The compressed audio data continuously output from 3 at a transfer rate of 15 sectors / second is written in the buffer memory 14 at the transfer rate of 15 sectors / second, and the compressed audio data stored in the buffer memory 14 is written. When the amount of data exceeds a predetermined amount, the compressed audio data is read out from the buffer memory 14 as recording data by a predetermined amount in a burst manner at a transfer rate of 75 sectors / sec.
It is possible to continuously write the input data in the buffer memory 14 while always securing a data writing area of a predetermined amount or more therein.

Here, the recording data read in a burst from the buffer memory 14 is recorded on the magneto-optical disk 2 by controlling the recording position on the recording track of the magneto-optical disk 2 by the system controller 9. It is possible to record in a continuous state on the track. Moreover, as described above, the buffer memory 14
Since a data writing area of a predetermined amount or more is always secured, the system controller 9 detects that a track jump or the like has occurred due to disturbance or the like and interrupts the recording operation on the magneto-optical disk 2. The input data can be continuously written in the data write area of the predetermined amount or more, and the recovery processing operation can be performed in the meanwhile, and the input data can be continuously recorded on the recording track of the magneto-optical disk 2. it can.

Next, an audio signal reproducing system in this magneto-optical disk recording / reproducing apparatus will be described.

In this audio signal reproducing system, the reproducing-only area A ₁₀ and the recording / reproducing area A of the magneto-optical disk 2 are used.
It is for reproducing the record data continuously recorded on ₂₀ recording tracks, and the reproduction signal obtained by tracing the recording track of the magneto-optical disk 2 with the laser beam by the optical head 3 is the RF signal. It is binarized by the circuit 5 and supplied to the encoder / decoder 11.

The encoder / decoder 11 has a function of performing a decoding process corresponding to the encoding process by the encoder / decoder 11 in the audio signal recording system, and is binarized by the RF circuit 6. The reproduced output is subjected to the above-described decoding processing for error correction and EFM decoding processing, and the above-mentioned compressed audio data is reproduced at a transfer rate of 75 sectors / second. The reproduced data obtained by the encoder / decoder 11 is supplied to the buffer memory 14. In the buffer memory 14, writing and reading of data are controlled by the system controller 9, and reproduced data supplied from the encoder / decoder 11 at a transfer rate of 75 sectors / sec burst at the transfer rate of 75 sectors / sec. Will be written. Also,
In the buffer memory 14, the reproduction data written in burst at the transfer rate of 75 sectors / second is stored in the buffer memory 14.
It is continuously read at a transfer rate of sectors / second.

The system controller 9 writes the reproduced data in the buffer memory 14 at a transfer rate of 75 sectors / second, and continuously writes the reproduced data from the buffer memory 14 at a transfer rate of 15 sectors / second. Memory control such as reading is performed.

Further, the system controller 9 controls the buffer memory 14 as described above and records the reproduction data burst-written from the buffer memory 14 on the magneto-optical disk 2 by the memory control. The playback position is controlled so that playback is continued from the track. The control of the reproducing position controls the reproducing position of the reproducing data which is burst-read from the buffer memory 14 by the system controller 9 and specifies the reproducing position on the recording track of the magneto-optical disk 2. Is supplied to the servo control circuit 8.

That is, the system controller 9
Increments the write pointer of the buffer memory 14 at a transfer rate of 75 sectors / second, writes the reproduction data in the buffer memory 14 at a transfer rate of 75 sectors / second, and sets the read pointer of the buffer memory 14 to the read pointer. The reproduction data is continuously read from the buffer memory 14 at the transfer rate of 15 sectors / second by continuously incrementing at the transfer rate of 15 sectors / second, and writing is performed when the write pointer catches up with the read pointer. Stop the above buffer memory 14
The write pointer of the buffer memory 14 is burst-wise incremented at a transfer rate of 75 sectors / second to perform memory control so that writing is performed when the data amount of the reproduction data stored in the storage device becomes a predetermined amount L or less. .

By the memory control by the system controller 9 as described above, the compressed audio data reproduced from the recording track of the magneto-optical disk 2 is recorded in 7
Burst data is written in the buffer memory 14 at a transfer rate of 5 sectors / second, and the compressed audio data is reproduced from the buffer memory 14 as 75 sectors / second.
Since the data is continuously read at the transfer rate of 2 seconds, the reproduction data is continuously read from the buffer memory 14 while always ensuring a data reading area of a predetermined amount or more in the buffer memory 14 with respect to the buffer memory 14. be able to. In addition, the buffer memory 14
The reproduction data read in bursts from the magneto-optical disk 2 can be reproduced continuously by controlling the reproduction position on the recording track of the magneto-optical disk 2 by the system controller 9. it can. Moreover, as described above, since the buffer memory 14 always has a data read area of a predetermined amount or more, the system controller 9 detects that a track jump or the like has occurred due to disturbance or the like, and the magneto-optical disk. Even when the reproducing operation for 2 is interrupted, the reproducing data can be read from the data reading area of the predetermined amount or more and the output of the analog audio signal can be continued, and the restoration processing operation can be performed during that time.

From the buffer memory 14 to 15 sectors /
Compressed audio data obtained as reproduction data continuously read at a transfer rate of 2 seconds is compressed / decompressed processing circuit 1
3 is supplied. The compression / expansion processing circuit 13 performs ATRAC decoding processing corresponding to the ATRAC encoding processing in the recording system. The operation mode is designated by the system controller 9, and the compression / expansion processing is performed in the magneto-optical disk recording / reproducing apparatus. The audio data is expanded five times to reproduce digital audio data having a transfer rate of 75 sectors / second. The digital audio data reproduced by the compression / expansion processing circuit 13 is converted into an analog signal by the AD / DA conversion section 12 and output as an analog reproduced audio signal.

In this magneto-optical disk recording / reproducing apparatus, the encoder / decoder 11 has its operation mode controlled by the system controller 9.
In the computer data write mode, the data transferred from the outside via the host data interface is stored in the buffer memory 15, and the data read from the buffer memory 15 is supplied to the encoder / decoder 16. The encoder / decoders 16 and 11 are connected to the buffer memory 1
The data supplied via 5 is subjected to error correction encoding processing, EFM encoding processing, and the like. The data encoded by the encoders / decoders 16 and 11 are supplied to the magnetic head drive circuit 5. The magnetic head drive circuit 5 is connected to the magnetic head 4 and drives the magnetic head 4 so as to apply a modulating magnetic field according to the data to the magneto-optical disk 2. In the recording mode, the system controller 9 automatically generates the TOC data table indicating the recording position of the data area A ₂₁ of the recording / reproducing area A _{20 in} the buffer memory 11, and the TOC data is recorded in the recording mode. At the end of, the control for recording in the lead-in area A ₂₂ is performed.

That is, the system controller 9
When a write request is issued from the host side, the computer enters the computer data write mode and performs the following control operation.

In the computer data write mode, first, in the data previously transferred from the host side and stored in the buffer memory 15, there is the same cluster data as the data transferred from the host side this time. If the data of the same cluster as the data transferred from the host side this time does not exist in the buffer memory 15, the data transferred from the host side this time is newly stored in the buffer memory 15. To do.

If the data previously stored in the buffer memory 15 includes data of the same cluster as the data transferred from the host side this time,
The data transferred from the host side this time is overwritten in the storage location in the buffer memory 15 where the data of the same cluster is stored first.

Then, it is judged whether or not there is all data for one cluster (for example, 64 KB) in the buffer memory 15, and if there is no data for one cluster, the write mode is terminated as it is. If there is one cluster of data, the buffer memory 15
The data for the cluster is read and the magneto-optical disk 2 is read.
The servo control circuit 8 and the encoder / decoder 11 are controlled so as to write to Then, after writing one cluster of data to the magneto-optical disk 2, the write mode is ended. As a result, every time the data accumulated in the buffer memory 15 reaches one cluster,
The data for one cluster is written on the magneto-optical disk 2. That is, on the magneto-optical disk 2, the data recorded on the disk is rewritten through the buffer memory 15 in units of one cluster.

As described above, the sector unit data is first written in the buffer memory 15, and every time the data accumulated in the buffer memory 15 reaches one cluster, the data for one cluster is transferred to the magneto-optical disk. By writing to the disk 2, it is possible to access in units of one cluster or in units of sectors.

Here, the system controller 9 manages whether the data is read / written to / from the storage locations of the areas divided in cluster units on the buffer memory 15.

Then, the system controller 9 is
When the amount of data less than one cluster accumulated in the buffer memory 15 has to be written in the magneto-optical disk 2, the insufficient data of the cluster is read from the magneto-optical disk 2 and stored in the buffer memory 15. The servo control circuit 8 and the encoder / decoder 11 are controlled so that the data of one cluster 68 KB is combined and the data of one cluster is written to the magneto-optical disk 2. For example, when rewriting data over a plurality of clusters, for data less than the first and last one clusters, the shortage data of the clusters is read from the magneto-optical disk 2 and stored on the buffer memory 15. Rewriting control is performed by synthesizing data of one cluster and writing the data on the magneto-optical disk 2. Data less than one cluster generated at the end of one data file is written in the magneto-optical disk 2 by performing the above-mentioned rewrite control, and is left in the buffer memory 15, Data on the head portion of the data file is combined on the buffer memory 15 to form one cluster of data and then written again on the magneto-optical disk 2, so that a useless recording area is recorded on the magneto-optical disk 2. Is not generated, and the storage capacity of the magneto-optical disk 2 can be utilized to the maximum.

In the computer data read mode, the encoder / decoders 11 and 14 are set to the R
The reproduction output binarized by the F circuit 6 is subjected to processing such as decoding processing for error correction and EFM decoding processing to reproduce data. Then, the reproduction data obtained by the encoder / decoder 14 is stored in the buffer memory 15. Then, the reproduction data is read from the buffer memory 15 and transferred to the outside via the host data interface (SCSI).

That is, the above system controller 9
When a read request is issued from the host, the device enters the read mode and performs the following control operation.

In the computer data read mode, first, it is judged whether or not the target data is present in the data previously read from the magneto-optical disk 2 and stored in the buffer memory 15, and the buffer is stored. When there is no desired data in the memory 15, the servo control circuit 8 and the encoder / decoder 14 are controlled so as to read the desired data from the magneto-optical disk 2, and the buffer memory is sent to the buffer controller 13 by the buffer memory. Control is performed to specify the storage location of the data on 15, and the target data is read from the magneto-optical disk 2 and stored in the buffer memory 15. Here, the buffer memory 15 is divided into cluster units, and the target data is stored in the position of each sector of the cluster to which it belongs.

Then, when the target data is prepared on the buffer memory 15, the buffer memory 15
The target data is read from and is transferred to the outside via the host data interface.

[0058]

As described above, in the magneto-optical disk according to the present invention, since the defect management data indicating the defective area in the recording area in cluster units is held in the lead-in area, the defective area in the recording area is clustered. The defect management data shown in units can be given to the recording / reproducing system.

Further, in the magneto-optical disk recording / reproducing apparatus according to the present invention, the success control means manages the cluster including the defect area based on the defect management data reproduced from the lead-in area of the magneto-optical disk. By accessing each cluster excluding the cluster including the defective area and recording and reproducing the clustered recording data in units of one cluster, the cluster including the defective area can be quickly managed, and the magneto-optical disk on the host side. It is possible to improve the error rate without the need to manage the defective area.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magneto-optical disk recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a schematic plan view for explaining the structure of a magneto-optical disk used in the magneto-optical disk recording / reproducing apparatus.

FIG. 3 is a flowchart showing a procedure of a formatting process for the magneto-optical disk.

FIG. 4 is a diagram showing an outline of defect management data of the magneto-optical disk.

FIG. 5 is a diagram showing an outline of defect management data on a lead-in area of the magneto-optical disk.

FIG. 6 is a diagram showing a relationship between a physical cluster and a logical cluster in the magneto-optical disk.

FIG. 7 is a diagram for explaining a cluster structure of data to be recorded on a magneto-optical disk by the magneto-optical disk recording / reproducing device.

[Explanation of symbols]

 1 ... Spindle motor 2 ... Magneto-optical disk 3 ... Optical pickup 4 ... Magnetic head 5 ... Magnetic head drive circuit 6 ... RF circuit 7 ... Address decoder 8 ... Servo Control circuit 9 ... System controller 11 ... Encoder / decoder 12 ... AD / DA converter 13 ... Compression / decompression processor 14 ... Buffer memory 15 ... Buffer memory 16 ... Encoder /decoder

Claims (3)

[Claims] 1. A magneto-optical disk in which clustered recording data is recorded in units of one cluster, and a lead-in area for recording defect management data indicating a defective area in the recording area in units of clusters. Magneto-optical disk. 2. One cluster has three link sectors,
The magneto-optical disk according to claim 1, wherein the sub-data sector is composed of one sector and the data sector is composed of 32 sectors. 3. A cluster of recording data for a magneto-optical disk having a lead-in area for recording defect management data indicating a defective area in the recording area in units of clusters.
A magneto-optical disk recording / reproducing apparatus for recording / reproducing in units of clusters, wherein a cluster including the defective area is managed based on the defect management data reproduced from the lead-in area of the magneto-optical disk, and the defective area is recorded. And a cluster control unit for accessing each cluster except the cluster including the defective area, and recording and reproducing the clustered record data in units of one cluster. Magneto-optical disk recording / reproducing device.