JPS61248266A - Optical disk device - Google Patents

Abstract

PURPOSE:To omit an exchange track by using an exchange sector separated by the prescribed number of tracks if exchange sectors are insufficient. CONSTITUTION:In an optical disk device, data are recorded in the optional sector area 2 of a user area on a rotating optical disk 1, whether the data are correctly written or not is confirmed after waiting by one rotation, and if error status is bad, the data are rerecorded in an exchange sector area 3 on the same track to avert a defect on the optical disk 1. When data are already recorded in an exchange sector area 3, a recording head is successively moved in a track direction by the already determined number of tracks during one rotation. The data shunted in the exchange sector area 3 on the track after movement are rerecorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device, and particularly to a recording format.

[Conventional technology]

Figure 4 is from Nikkei Electronics, November 2, 1983.
This is a conceptual diagram showing the recording format on an optical disk used in the conventional optical disk device shown in 1 (p. 194), where 1 is an optical disk, 2 is a sector area of the user area, and 3 is a sector in a bad condition (incorrect). The spare sector area 4 is used for re-recording the data of the track, and the spare sector area 4 is a spare track area for re-recording the data of the track for which there is a shortage of spare sectors.

Next, the operation will be explained. In an optical disk device that has a configuration that records data in any sector of the user area of the rotating optical disk 1 and confirms whether the data has been written correctly after waiting for rotation, an error in the sector area 2 of the user area where data is recorded is detected. When the disc condition is poor, defects on the optical disc 1 are avoided by re-recording the recorded data in the spare sector area 3 of the same track. When the spare sector area 3 in the same track is insufficient, the recording data of the corresponding track is re-recorded in the spare track area 4.

[Problem that the invention seeks to solve]

Since the conventional optical disk device is configured as described above, it is necessary to prepare a large number of replacement sectors. However, as the diameter of the optical disk becomes smaller, there is a problem in that when the number of sectors in one track decreases, the ratio of the effective user area decreases.

In addition, when using a replacement track, it is necessary to move the recording head from the corresponding track to the replacement track area, and this movement requires a short access time (lQQmsec).
There were problems such as requiring ~500m5ec).

The present invention has been made to solve the above-mentioned problems, and aims to provide an optical disc device that can limit the number of spare sectors and eliminates the need for spare tracks.

[Means for solving problems]

The optical disk device according to the present invention limits the number of spare sectors in one track to, for example, one sector to ensure a wide user area, and when there is a shortage of spare sectors, uses a spare sector located a predetermined number of tracks away. It is structured as follows.

[Effect]

In the optical disk device according to the present invention, when there is a shortage of spare sectors, the recording track is moved to a spare sector a predetermined number of tracks apart and the corresponding data is recorded during one rotation wait. This predetermined number of tracks is set to a value sb and a large value that allows reliable movement during one waiting time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is an optical disk, 2 is a sector area of the user area, and 3 is a replacement sector area used for re-recording a sector in a bad state.

Next, the operation will be explained. The optical disc device records data in an arbitrary sector area 2 of the user area on the rotating optical disc 1, and after waiting for the rotation, checks whether the data has been written correctly, and if the error is in bad condition, writes data to an alternate sector area 3 on the same track. Defects on the optical disc 1 are avoided by re-recording data on the optical disc 1. Here, if the replacement sector area 3 has already been recorded, the recording head is sequentially moved in the track direction, and the movement is performed over a predetermined number of tracks during the -rotation wait, and the recording head is moved in the track after the movement. The data to be avoided is re-recorded in the spare sector area 3.

Here, the probability that the replacement sector has already been recorded is very low, and in this case, it may be assumed that the recording is defective, but there is a method of repeating the above operation and searching for a vacant replacement sector. A control flowchart in the above method is shown in FIG.

However, n is the predetermined number of tracks.

Next, FIG. 3 shows an example of recording when one track has two sectors with bad errors. Reference numeral 21 indicates a sector with a first bad error state, and 22 indicates a sector with a second bad error state. Reference numeral 31 indicates a replacement sector in which the data of sector 21 is re-recorded, and reference numeral 32 indicates a replacement sector in which data in sector 22 is re-recorded.

In the above embodiment, the number of replacement sectors within one track is 1.
Although it has been described as one, a plurality of them may be provided, and if all the replacement sectors in a track have been recorded, a configuration may be adopted in which the replacement sectors are avoided by a predetermined number of tracks apart. In addition, in the above embodiment, it was explained that there is no replacement track, but
If the replacement sector that has been moved by a track has already been recorded, the replacement sector can be moved using the replacement track, ignoring the access time.The replacement sector is configured to use the replacement sector on a track that is a predetermined number of tracks away. can be used effectively. Furthermore, by using alternate tracks, an access time of 1QQmsec to 50Qmsec is required, but in the present invention, the access time is 1 rotation, that is, about 3Qmsec.
It can be accessed in a short time such as sec.

Furthermore, if the use of alternative sectors is to some extent removed, e.g. 30
By setting the values to be separated by about a track distance, various effects can be obtained, such as the performance not being degraded even if a defect spanning multiple tracks occurs on the disk.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a disc format of an optical disc device according to an embodiment of the present invention, FIG. 2 is a flowchart diagram showing an operation for accessing a replacement sector in the present invention, and FIG. 3 is a diagram showing an example of the present invention. A diagram showing a recording example according to the embodiment,
FIG. 4 is a diagram showing a conventional disc format. 1 is an optical disk, 2 is a user area sector area, 3 is a replacement sector area, 21 and 22 are sectors with bad error status,
31°32 are used replacement sectors. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In an optical disk device having an optical disk that divides one track into multiple sectors and records intermittently,
comprising means for re-recording data of a sector with a bad error state in a predetermined replacement sector on the optical disc,
An optical disc device characterized by comprising means for re-recording in the spare sector a predetermined number of tracks apart when recording is not possible in the spare sector to be recorded. (2) The number of tracks to be moved in the case where recording cannot be performed in the replacement sector to be recorded is set within the number of tracks that can be reliably moved during one revolution of the disk. Optical disk device.