JPH06231502A - Magnetooptic disk - Google Patents

Abstract

PURPOSE:To make access to a spare sector in a short time even when the recording area of a magnetooptic disk is divided concentrically and the recording/reproducing condition of data is switched for every area in the magnetooptic disk which record data, for example, by a thermomagnetic method. CONSTITUTION:The recording area of a magnetooptic disk D4 is divided concentrically, and the recording/reproducing condition of data is switched for each of areas AR1-AR3. In this case, spare sector SP1-SP3 are formed respective areas AR1-AR3.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Field of the Related Art (FIGS. 5 and 6) Problems to be Solved by the Invention (FIGS. 7 and 8) Means for Solving the Problems (FIGS. 1 and 3) Operation (FIGS. 1 and 4) ) Example (1) First Example (FIG. 1) (2) Second Example (FIG. 2) (3) Third Example (FIGS. 3 and 4) (4) Other Examples Invention Effect of

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk,
For example, it can be applied to a magneto-optical disk that records desired data by applying a thermomagnetic recording method.

[0003]

2. Description of the Related Art Conventionally, in this type of magneto-optical disk, a thermo-magnetic recording method is applied by rotating and driving under constant angular velocity conditions and intermittently irradiating a light beam. It is designed to record data.

In this magneto-optical disk, there may be a case where a region where data cannot be recorded / reproduced more reliably such as a flaw or unevenness of the magnetic film is formed. For this reason, in the magneto-optical disk, this area is detected in advance and this area is set as the defect area, and the desired data is recorded by using the previously prepared space area instead of this area. Has been done.

For example, a magneto-optical disk D as shown in FIG.
, A recording track is formed concentrically, and this recording track is divided into sectors (each sector is represented by a numeral 1, 2, respectively).
(Represented by 3, 4, ...) And the desired data is recorded and reproduced. If the sector 3 cannot correctly record / reproduce data, in the magneto-optical disk D, this sector 3 is set as a defect sector, and the data to be recorded in this sector 3 is stored in the outermost spare area SP. Record in the spare sactor S.

Thus, when reproducing the magneto-optical disk D, in the magneto-optical disk device, the sectors 1, 2 are
When the data is reproduced, the optical pickup is moved to the outermost spare area SP, the data of the spare sector S is reproduced, and then the optical pickup is moved to the original recording track to reproduce the sector 4. Has been done.

On the other hand, as shown in FIG. 6, in the magneto-optical disk D1, the spare areas SP1, SP2, S are arranged.
There is also one in which P3 is formed by being divided in the radial direction of the magneto-optical disk D1, and in this case, the time required to move the optical pickup between the defect sector and the spare sector can be shortened.

[0008]

By the way, if the recording capacity of this type of magneto-optical disk can be increased, the usability of this type of magneto-optical disk can be further improved, and it is considered to be convenient.

As one of the methods, a method is conceivable in which the recording area of the magneto-optical disk is divided into concentric circles and the condition for recording / reproducing data is switched in each area. That is, FIG.
As shown in FIG. 5, in the magneto-optical disc D2, the recording area is divided into concentric circles, thereby forming the first to third recording areas AR1 to AR3.

When recording data on the magneto-optical disk D2, each recording area AR is used in the magneto-optical disk device.
The frequencies of the clocks used for recording data are switched so that the recording wavelengths become the same at the innermost circumferences of 1 to AR3. On the other hand, at the time of reproduction, the characteristics of the equalizer for processing the reproduction signal are switched in each of the areas AR1 to AR3.

On the other hand, in the spare area SP2, as shown in FIG. 8, a method of allocating the spare area SP2 to the outermost periphery of the magneto-optical disk D3 can be considered. However, in this method, every time the optical pickup is moved to the spare sector, it is necessary to switch the clock and the equalizer, and in this type of switching, it takes time for the operation to stabilize after switching. After all, there is a problem that the whole processing time becomes long.

The present invention has been made in consideration of the above points. Even if the recording area of the magneto-optical disk is divided into concentric circles and the condition for recording and reproducing data is switched in each area, it takes a short time. An attempt is made to propose a magneto-optical disk capable of accessing a spare sector.

[0013]

SUMMARY OF THE INVENTION In order to solve the above problems, according to the present invention, a magneto-optical disk D4 is formed in which recording tracks are sequentially formed to record desired data.
In, the recording area is divided into concentric circles in the radial direction to form first and second recording areas AR1 and AR2.
And the clocks used for data recording in the second recording areas AR1 and AR2 are switched, and the substitute area SP1 of the first recording area AR1 is replaced with the first recording area A1.
R1 is assigned to the second recording area AR2, and the substitute area SP2 of the default area of the second recording area AR2 is assigned to the second recording area AR2.

Further, in the second invention, the recording track is formed in a spiral shape, and the alternative area SP1 of the first recording area AR1 is formed at the boundary with the second recording area AR2.

[0015]

The replacement area SP1 of the default area of the first recording area AR1 is assigned to the first recording area AR1, and the replacement area S of the default area of the second recording area AR2 is assigned.
By allocating P2 to the second recording area AR2, even when the clocks used for recording data in the first and second recording areas AR1 and AR2 are switched, the replacement areas SP1 and SP are not switched.
2 can be accessed.

In particular, the replacement area S of the first recording area AR1
If P1 is formed at the boundary with the second recording area AR2, in the case where the recording track is formed in a spiral shape and data is continuously recorded, the area required for switching the clock is effectively used and the replacement area SP1 is formed. Can be formed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment In FIG. 1, D4 indicates a magneto-optical disk as a whole, which is fixedly used in the magneto-optical disk device. Further, in the magneto-optical disk D4, the recording area is concentrically divided into three recording areas AR1 to AR3, and each area A
The recording areas AR1 to A are respectively provided on the innermost circumferences of R1 to AR3.
The spare areas SP1 to SP3 of R3 are formed.

As a result, in the magneto-optical disk D4, when recording the recording areas AR1 and AR2 on the outer peripheral side as compared with the recording areas AR2 and AR3 on the inner peripheral side, the frequency of the clock used for recording is switched to a higher level, and The recording area on the outer peripheral side is such that the recording capacity per one rotation of the magneto-optical disk D4 can be improved. Further magneto-optical disk D
In No. 4, as the recording capacity is increased, more sectors can be formed in the recording area on the outer peripheral side for one circumference of the magneto-optical disk D4, and the recording capacity can be improved as compared with the conventional magneto-optical disk. It is done like this.

Thus, in the magneto-optical disk D4,
By dividing the recording area in this way, it is necessary to switch the clock when the recording area is switched at the time of recording, and also the processing program for controlling the light amount of the light beam and the entire operation. Need to switch. Further, at the time of reproduction, it is necessary to switch the equalizer characteristic and the filter characteristic of the reproduction signal processing circuit, and it is also necessary to switch the processing program (this type of characteristic switching is hereinafter referred to as parameter switching).

That is, in order to efficiently record and reproduce data on the magneto-optical disk D4, each recording area AR is required.
It is necessary to set the parameter to an optimum value for each of 1 to AR3.

On the other hand, as in this embodiment, the spare areas SP1 to SP3 of the recording areas AR1 to AR3, respectively.
By forming the areas AR1 to AR3 in the magneto-optical disk apparatus, when the spare sector is accessed from the defect sector, this kind of parameter switching can be omitted, and the data recording / reproducing is required accordingly. The time can be shortened.

That is, in the magneto-optical disk device,
The recording areas AR1 to A are respectively provided in the areas AR1 to AR3.
In the case of forming the spare areas SP1 to SP3 of R3, after recording / reproducing data up to the defect sector, it is possible to record / reproduce the spare sector without changing the parameters by seeking the optical pickup to the spare sector.

When the recording / reproducing of the spare sector is completed, the magneto-optical disk device can seek the optical pick-up to the sector following the defect sector and record / reproduce the following data without switching the parameters. As a result, the time required for recording / reproducing data can be shortened.

According to the above construction, the recording area is concentrically divided into three recording areas AR1 to AR3, and each area AR is divided.
Recording areas AR1 to AR on the innermost circumferences of AR1 to AR3, respectively.
By forming three spare areas SP1 to SP3,
The spare sector can be accessed without switching the parameters, and the spare sector can be accessed in a shorter time accordingly.

(2) Second Embodiment In FIG. 2, D5 indicates a second embodiment of the magneto-optical disk according to the present invention, and in this embodiment, each recording area AR
Spare areas SP1 to SP3 in almost central portions of 1 to AR3
To form. In this way, even if the spare areas SP1 to SP3 are formed in substantially the central portions of the recording areas AR1 to AR3,
In the magneto-optical disk device, when accessing the spare sector, the spare sector can be accessed in a short time without switching the parameters, and the entire processing time can be shortened accordingly.

(3) Third Embodiment In FIG. 3, D6 shows a third embodiment of the magneto-optical disk according to the present invention, and in this embodiment, each recording area AR
Spare areas SP1 to SP3 are formed on the outermost circumferences of 1 to AR3. Even when the spare areas SP1 to SP3 are formed on the outermost circumference of each of the recording areas AR1 to AR3 in this way, in the magneto-optical disk device, when accessing the spare sector, it is possible to access in a short time without switching the parameters. Therefore, the entire processing time can be shortened accordingly.

Further, in this embodiment, the recording track is formed in a spiral shape, and the spare area SP is formed.
When recording and reproducing continuous data with 1 to SP3 interposed therebetween, parameters can be switched by using a period during which the spare areas SP1 to SP3 are scanned by the optical pickup.

That is, in the case of switching the parameters in this way, in the magneto-optical disk device, it takes time to operate properly after switching, so that when data is recorded across each of the areas AR1 to AR3, further, When continuously reproducing the data recorded across the areas AR1 to AR3, as shown in FIG.
A region SL in which data cannot be correctly recorded / reproduced at the boundary of R1 to AR3 and the optical pickup scans during that period SL
For 1 and SL2, continuous data cannot be recorded.

That is, in the magneto-optical disk, when the areas AR1 to AR3 are divided and the parameters are switched in this manner, the areas SL1 and SL2 are wasted.

On the other hand, in the spare areas SP1 to SP3, the spare areas SP1 to SP3 are stored in the areas AR1 to AR3 by accessing the spare areas without switching the parameters and recording the data of the defect sector at random. If formed at the boundary, each area AR1
When data is recorded / reproduced across the AR3, the parameters can be switched in the spare areas SP1 to SP3, whereby it is possible to prevent the useless area from being generated due to the parameter switching.

According to the configuration shown in FIG. 3, each recording area AR
By forming the spare areas SP1 to SP3 on the outermost circumferences of 1 to AR3, the same effect as that of the first embodiment can be obtained, and in addition to this, useless areas are generated due to the switching of the parameters. Can be prevented.

(4) Other Embodiments In the above embodiment, each recording area AR
1 to AR3, the case where the spare regions are formed in the outermost periphery, the substantially central portion, and the innermost periphery has been described, but the present invention is not limited to this, and the spare regions are alternately formed in the outermost periphery and the innermost periphery, for example. Alternatively, a plurality of spare areas may be formed in each of the recording areas AR1 to AR3.

Further, in the above-mentioned embodiment, the case where the recording area is divided into three has been described, but the present invention is not limited to this and can be widely applied to the case where various division numbers are selected as needed. .

Further, in the above-mentioned embodiment, the case where the present invention is applied to the magneto-optical disk incorporated in the magneto-optical disk device has been described, but the present invention is not limited to this, and is widely applicable to replaceable magneto-optical disks. Can be applied.

[0036]

As described above, according to the present invention, when the recording area of the magneto-optical disk is divided into concentric circles and the condition for recording / reproducing data is switched in each area, each area is replaced by each area. By forming the region, it is possible to obtain a magneto-optical disk capable of accessing the alternative region in a short time.

[Brief description of drawings]

FIG. 1 is a plan view showing a magneto-optical disk according to an embodiment of the present invention.

FIG. 2 is a plan view showing the second embodiment.

FIG. 3 is a plan view showing the third embodiment.

FIG. 4 is a plan view for explaining switching of parameters.

FIG. 5 is a plan view for explaining a spare area.

FIG. 6 is a plan view showing a case where a spare region is divided and formed.

FIG. 7 is a plan view showing a case where a recording area is divided and formed.

FIG. 8 is a plan view showing the arrangement of spare areas.

[Explanation of symbols]

1, 2, 3, 4 ... Sectors, AR1 to AR3 ... Recording area, D to D6 ... Magneto-optical disk, S ... Spare sector, SP1 to SP3 ... Spare area.

Claims (2)

[Claims] 1. A magneto-optical disk adapted to record desired data by sequentially forming a recording track, wherein a recording area is divided into concentric circles in a radial direction.
Recording areas are formed, and the clocks used for recording the data are switched in the first and second recording areas.
Of the first recording area as the alternative area of the record area of
Of the second recording area and an alternative area of the defect area of the second recording area is allocated to the second recording area. 2. The recording track is formed in a spiral shape, and the alternative area of the first recording area is formed at a boundary with the second recording area. Magneto-optical disk.