JPH02301047A - Magneto-optical disk recording system - Google Patents

Abstract

PURPOSE:To improve the transfer efficiency of data by reducing the number of times of access of a head by recording information with respect to an unusable sector on the specific area of a disk comprehensively after completing a series of recording operations. CONSTITUTION:Read out data is compared with the data stored in a data memory circuit 14 with an error check circuit 15, and it is judged whether or not a sector error occurs. An operation is completed when no sector error exists, and when the sector error exists, a signal to identify whether the data is recording data or a recording control signal, and the sector signal and the track signal of an alternate sector are recorded on the user part of the sector in which the error occurs as an alternate signals. Next, a magneto-optical head 12 is moved to the alternate sector, then, records the data. Next, it is judged whether or not a series of recording operations are completed, and the recording of the data is performed again when they are not completed and are continued, and when they are completed, the operation is completed after the information of the position of a defective sector, etc., is recorded comprehensively on the prescribed area at the inner or outer peripheral part of the disk.

Description

[Detailed Description of the Invention] [Summary] Regarding the recording method of magneto-optical disks in which information is recorded and reproduced using laser light, etc., delays in transfer speed due to redundant accesses of the optical head can be reduced, and data transfer efficiency is improved. The purpose of the present invention is to provide a magneto-optical disk recording system that can record a sector replacement signal and replacement sector number in the user area when an unusable sector occurs during normal operation of a magneto-optical disk device. The present invention includes a magneto-optical disk recording method characterized in that, after the series of recording operations is completed, information regarding the unusable sectors is collectively recorded in a specific area of the disk.

[Industrial Application Field] The present invention relates to a recording method for a magneto-optical disk in which information is recorded and reproduced using a laser beam or the like.

[Conventional technology]

A magneto-optical disk or a phase-change magneto-optical disk is a rewritable recording medium that records and reproduces a large amount of information, and is used as an external storage device for computers and the like. In this magneto-optical disk, information is recorded by irradiating the disk surface with a laser beam and applying a magnetic field to create a magnetization reversal region due to a local temperature upper field, and reproduction is performed by irradiating the disk surface with a laser beam and changing the direction of magnetization. It utilizes the Kerr effect, in which the plane of polarization rotates according to the

In addition, as a rewritable magneto-optical disk, a phase change type recording medium is used, and the power and irradiation time of laser beam irradiation are controlled to create a first state (erasure state B) and a second state B (
Recording/erasing is performed according to the recording status). and,
A recording area of a magneto-optical disk or the like is configured with a certain formant, similar to a normal optical disk.

FIG. 3 is a diagram showing the format of a conventional magneto-optical disk.A magneto-optical disk has many concentric tracks on the disk surface, and each track is equally divided into a plurality of sectors. It consists of the data section. This data section consists of a user section that can be used freely by the user, a directory section that records file names and their attributes on the inner peripheral side of the disc, and a recording control section that records data that controls recording operations. In addition, as shown in FIG. 4, each sector is generally a preformer) fi
It consists of a JT area and a user area, and consists of 512 bytes or 1024 bytes in total. The preformat area is, for example, AGC (Automatic Galn).
Con-Lro l, automatic gain control), sector mark (
SectorMark, partial mark), VFO (Va
riable FrequencyOscillato
r), 5YNCByte (synchrobyte), 1
It consists of areas for recording 0 (Instruction Data), Gap, etc.

[Problems to be Solved by the Invention] In a magneto-optical disk, there is a method in which certain information is recorded and then read out, and if an unusable sector occurs, the information is moved to a replacement sector and recorded. Conventionally, in this method, as shown in FIG. 5, replacement sector information such as sector numbers and track numbers is recorded in a directory area (recording control area) by accessing an area on the inner circumference of the disk. , then access the spare sector area to record user information, and then return to the original track to record the next information. In addition, even when reading data, if a bad sector is encountered, it is necessary to access the magneto-optical head in the same way as when writing data. Therefore, if an unusable sector occurs, the magneto-optical head must be accessed many times.
There was a problem with the data transfer speed being significantly delayed.

On the other hand, as shown in FIG. 6, in the method of recording replacement sector information in the data area when a bad sector occurs,
Since the destination of the replacement sector is recorded in the data area of the bad sector, redundant accesses can be significantly reduced.
can. In reading, when an unusable sector is encountered, redundant accesses can be reduced by sequentially reading out the numbers of replacement sectors in the data area and accessing them. However, with rewritable disks, there is no need to reuse bad sectors when rewriting information. If information about replacement sectors is simply recorded in the user area, the same thing will have to be done again when performing the second erasing/recording operation. Therefore, there was a problem that extra work was required and the data transfer speed was delayed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magneto-optical disk recording system that can reduce delays in transfer speed due to redundant accesses of the optical head and improve data transfer efficiency.

(Means for Solving the Problem) The above problem is to record a sector replacement signal and a replacement sector number in the user area when an unusable sector occurs during normal operation of a magneto-optical disk device, and record the sector replacement signal and replacement sector number in the user area. This is achieved by a magneto-optical disk recording method characterized in that information regarding the unusable sectors is collectively recorded in a specific area of the disk after a series of recording operations are completed.

[Effect]

In the present invention, since information regarding replacement sectors is recorded in the user area (data area), the number of accesses of the optical head can be reduced. Furthermore, by collectively recording information regarding unusable sectors in a specific area of the disk, it is possible to avoid accessing bad sectors many times.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to an illustrated embodiment.

FIG. 1 is a block diagram of a recording signal processing system of a magneto-optical disk device according to an embodiment of the present invention.

In the figure, 11 is a magneto-optical disk, 12 is a magneto-optical head for recording and reproducing information using a laser beam, 13 is a drive circuit for driving the magneto-optical head 12, 14 is a data storage circuit for storing recorded data, 15 is a magneto-optical head 1
This is an error check circuit that checks the data read in step 2 for errors. The drive circuit 13 applies a drive signal to the magneto-optical head 12 based on a control signal from the data storage circuit 14 . The magneto-optical head 12 irradiates a predetermined recording area of the magneto-optical disk 11 with a laser beam, and causes the data storage circuit 14 to record the recorded data. The error check circuit 15 reads out the data recorded by the magneto-optical helad 12 again, compares it to see if it matches the data stored in the data storage circuit 14, and records it again in the user section area if they do not match. The drive circuit 13 is controlled accordingly.

FIG. 2 is a flowchart illustrating the recording operation of the embodiment of the present invention.

First, after starting to record user information, the magneto-optical head 1
2 accesses the target sector for recording and records data (steps STI, ST2). Next, when the magneto-optical RAD 12 returns to the same sector, it reads out the previously recorded data (step ST3). Then, the error check circuit 15 compares the read data with the data stored in the data storage circuit 14,
Determine whether a sector error has occurred (step ST
4). It ends when there is no sector error, and when there is a sector error, a signal identifying whether it is recording data or a recording control signal as a replacement signal is sent to the user part in the sector where the error occurred, and the sector number and track number of the replacement sector. etc. are recorded (step ST5). Next, the magneto-optical head 12 moves to the above-mentioned replacement sector (step ST6) and records data. Next, step ST? to determine whether the series of recording operations has been completed? ),
When continuing without finishing, record the above data again (
Return to Step STI), and when finishing, record information such as the location of the bad sector in a predetermined area such as the inner or outer circumference of the disk, and then finish (Step 8) 1 A sector error has occurred again. Sometimes, steps ST2 to ST6 are repeated, that is, if sector errors occur continuously, the loop (2) is repeated, and in this case, the effect of the present invention is great.

According to the above method, when a sector error occurs due to a defect in the magneto-optical disk and the corresponding sector cannot be used, instead of recording the replacement sector number etc. as a replacement signal in a separate area, Since the bad sector information is recorded in the user section and the recording control section manages the information on the bad sector after the recording operation is completed, it is possible to prevent the bad sector from being accessed many times during recording. As a result, delays in transfer speed can be reduced, and when alternate processing is required, it has become possible to improve processing speed by about 0.1 degree.

In the above embodiment, when a sector error occurs, a replacement sector number etc. is recorded on the same corresponding track in the user area, but the scope of application of the present invention is not limited to this. It is sufficient if the sector replacement signal, replacement sector, and lid number are recorded in the user area when a sector replacement occurs.

During reproduction, access is performed based on the information regarding the replacement sector in the inner circumference, which is very advantageous.

Further, in the above embodiments, the present invention has been explained by giving an example of applying it to a magneto-optical disk recording system, but it can also be applied to a phase change type optical disk recording system.

〔Effect of the invention〕

As explained above, according to the present invention, when an unusable sector occurs, a sector replacement signal and a replacement sector number are recorded in the user area, and after a series of recording operations are completed, the unusable sector is By collectively recording information on a specific area of the disk, it is possible to reduce the number of head accesses, which is a bottleneck for magneto-optical disks, and improve data transfer efficiency, increasing overall transfer speed. can be raised.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a recording signal processing system of a magneto-optical disk device according to an embodiment of the present invention, FIG. 2 is a flowchart explaining the recording operation of an embodiment of the present invention, and FIG. 3 is a format of a conventional magneto-optical disk. FIG. 4 is a diagram showing the format of the sector area of a conventional magneto-optical disk. FIG. 5 is a diagram explaining the conventional recording method. FIG. 6 is a diagram showing information on replacement sectors in the data section. FIG. In the figure, 11 is a magneto-optical disk, 12 is a magneto-optical head, 13 is a drive circuit, 14 is a data storage circuit, and 15 is an error check circuit.

Claims (1)

[Claims] When an unusable sector occurs during normal operation of a magneto-optical disk device, a sector replacement signal and a replacement sector number are recorded in the user area, and the unusable sector is recorded after the series of recording operations is completed. A magneto-optical disk recording method that records information about sectors all at once in a specific area of the disk.