JPH04178975A - Method for recording data on magneto-optical disk - Google Patents

Abstract

PURPOSE:To prevent the simultaneous disappearance of the same backup data together with their original data by a defect by recording the backup data at a position separated from the recording position of the original data on a magneto-optical disk by a prescribed rotation angle. CONSTITUTION:Backup data D are recorded at a position separated from the recording position of their original data by a rotation angle of about 180 deg.. At the time of recording the backup data, a recordable vacant track with a sector number of S0+8 or S0+9, meaning that the '8' or '9' is added to the sector number S0 of the recording position of the original data D, is found. The backup data D are recorded at the recording position of the vacant sector, the track number of which is the farthest from the track number T0 of the recording position of the original data D. Therefore, even when a defect occurs for some reason in the physical property of a magneto-optical disk, such as a change in composition, etc., the backup data do not disappear at the same time together with their original data.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is directed to recording data on a magneto-optical disk in a double or multiple manner, for example as backup data, on the same magneto-optical disk. This invention relates to a method of recording data on a magneto-optical disk.

[Prior Art] A magneto-optical disk device is a storage device with a large storage capacity like a conventional write-once optical disk device, but it is capable of rewriting and erasing information, which is not possible with a write-once optical disk device. In recent years, a wide range of products for magneto-optical disks have been released, and magneto-optical disk technology is moving from the prototype stage to the commercialization stage.

As described above, magneto-optical disk devices have great expectations as the next generation of large-capacity storage devices, but since magneto-optical disks have extremely large capacities, they are subject to the existence of a certain degree of defects. . For this reason, the method for detecting and correcting defects in magneto-optical disks is
, and countermeasures have been taken.

For particularly important data, in order to prevent data loss due to defects that occur on the magneto-optical disk,
When recording data on a magneto-optical disk, the same data is recorded as backup data.

[Problems to be Solved by the Invention] However, in the past, backup data was recorded on magneto-optical disks without particularly considering the recording position of the original data. There has been a problem in that the data may be lost along with the original data and the backup function may not be fulfilled.

An object of the present invention is to provide a method for recording data on a magneto-optical disk in which data and the same data are not simultaneously lost due to defects.

[Means for solving the problem] The above purpose is to
In a method for recording data on a magneto-optical disk in which the data and the same data are recorded at different positions on the magneto-optical disk, the magneto-optical disk records the data at a position spaced apart by a predetermined rotational angle from the data recording position on the magneto-optical disk. This is achieved by a method of recording data on a magneto-optical disk, which is characterized by recording the same data.

[Effect 1] According to the present invention, since the same data as the original data is recorded at a position separated by a predetermined rotational angle from the original data recording position on the magneto-optical disk, the original data and the same data may be lost due to a defect. Data will not be lost at the same time.

Therefore, when the same data is used as backup data, the original data and the backup data will not be lost at the same time.

[Embodiment 1] A method of recording data on a magneto-optical disk according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Magneto-optical disk device 1 as an external storage device for CPUl0
2 is provided. In the magneto-optical disk device 12, a magneto-optical disk 13, which is a recording screw, is rotated by a motor 14, and a magneto-optical head 15 records or reads data. A magnet 16 is provided on the magneto-optical disk 13 for applying a magnetic field.

The magneto-optical disk 13 is provided with a large number of tracks as shown in FIG. 1(b), and each track is divided into a plurality of sectors. For example, in the case of a 5-inch magneto-optical disk 13, 18,751 tracks are provided, and each track is divided into 17 sectors.

When the CPU 10 records or reads data on the magneto-optical disk device 12, it outputs an ID number indicating the access position of the magneto-optical disk 13 to the magneto-optical disk device 12. The ID number is the tiger number T (0-18750)
) and sector number S (0 to 16),
The magneto-optical disk device 12 records or reads data at a position specified by an ID number.

Next, a method of recording data on a magneto-optical disk according to this embodiment will be explained with reference to FIG.

First, the CPU 10 outputs data D to be recorded to the magneto-optical disk device 12 along with an ID number (track number TO, sector number SO) indicating the data recording position. The magneto-optical disk device 12 records data D at the recording position of track number TO and sector number SO (FIG. 2(a)).

CPU10 stores the ID number of data D.

Next, backup data D, which is the same data as data D, is recorded. In this embodiment, backup data D is recorded at a position as far away from the original data D recording position as possible.

In other words, the data is recorded at a position that is approximately 180 degrees away from the original data recording position9.
8 for the sector number SO of the original data D recording position.
Or search for an empty recordable track whose sector number is S0±8 or SO+9 plus 9. I of the free sector whose track number is farthest from the track number TO of the original data D recording position among the moved up free sectors
D number (track number T1, sector number 5i=so±8
The backup data D is recorded at the recording position of (or SO+9) (Fig. 2 (bL (C)). In this way,
The backup data D is recorded at a position separated by a predetermined rotation angle from the original data recording position.

As described above, according to the data recording method of this embodiment, the backup data is recorded at a rotation angle position away from the original data. Figure 2 (b)) and ■ Defects due to external reasons such as scratches (Figure 2 (C))
Even if this occurs, both the original data and the backup data will not be lost. Furthermore, since the track numbers are also separated, the possibility of them disappearing together can be minimized.

However, if the recording position of the backup data is determined without taking into account the recording position of the original data as in the past, as shown in FIG. and backup data may be recorded. In such cases, defects caused by physical reasons such as compositional changes (Figure 3 (b)) or ■ defects due to external causes such as scratches (Figure 3 (C)) that occur on the magneto-optical disk may occur. , the backup data will be lost along with the original data.

The present invention is not limited to the above embodiments, and various modifications are possible.

For example, in the above embodiment, the same data was recorded at positions separated by a rotation angle of about 180 degrees from the original data recording position, but it is sufficient that the rotation angles are separated from each other by 90 degrees or more.

Furthermore, when searching for a free sector, the free sector is initially searched for from sectors approximately 180 degrees apart, but if no free sector is found, the rotation angle conditions are gradually loosened.

Further, in the above embodiment, the backup data was described as an example of the same data, but the present invention is applicable not only to backup data but also to cases where the same data is recorded for other purposes.

[Effects of the Invention] As described above, according to the present invention, since the same data is recorded at a position separated by a predetermined rotational angle from the original data recording position on the magneto-optical disk, the same data may be recorded due to a defect. data will not be lost at the same time.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a method of recording data on a magneto-optical disk according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a conventional method of recording data on a magneto-optical disk. In the figure, 10...CPU 12...Magneto-optical disk device 13...Magneto-optical disk 14...-Motor 15...Magneto-optical head 16...-Magnet Toso Co., Ltd.

Claims (1)

[Scope of Claims] 1. A method for recording data on a magneto-optical disk, in which, when recording data on a magneto-optical disk, the data and the same data are recorded at different positions on the magneto-optical disk, comprising: A method for recording data on a magneto-optical disk, characterized in that the same data is recorded at a position spaced apart by a predetermined rotational angle from a recording position of the data on the magneto-optical disk.