KR19980059941A - Rewritable optical disc - Google Patents

Abstract

In the rewritable optical disc, in particular, the absolute position information of a sector is wobblingly repeated without a physical header area on one side of a hill and valley interface of a disc having a signal track composed of hills and valleys. By eliminating the waiting time to reach the header area, the random access time is faster, the absolute position information of the sector is not damaged, and the signal recorded in wobble shape has the absolute position information of the corresponding mountain and the valley together. The control information can be known in the mode, and both mountain and valley tracks are used as the data recording area, whereby the recording density is increased and the disk capacity is increased.

Description

Rewritable optical disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rewritable optical disc, and more particularly, to a rewritable recording of an absolute address of a sector in a wobbling shape on one side of an interface of a peak and a valley of a disc having a signal track composed of a peak and a groove. Relates to an optical disk.

In a conventional reproduction-only optical disc, information is recorded along a track on the surface of an information recording medium. The recording information is reproduced by constant rotation of the disc and tracking of the light beam.

On the other hand, in the case of a rewritable optical disc, since the first disc has no information, disc control and recording are impossible.

Therefore, for this purpose, disc tracks are made by mountains and valleys, and information is recorded along the tracks, and control information for random access and rotation control is separately recorded on the disc, so that even on a blank disc in which no information signal is recorded. Enable tracking control.

At this time, the rewritable optical disc is managed by zone unit for random access. A total of 24 zones are divided.

That is, the rewritable optical disc is divided into a lead in area, a data area, and a lead out area from the innermost side in the radial direction. The zone is a unit for dividing the data area. This is the area where actual data is recorded.

As a method for recording the control information on the disc, there is a method of previously recording information indicating the physical position of the disc at a corresponding position on the disc.

That is, the header area of FIG. 1 is hard-formatted, and is preformatted at the start position for each sector.

Thus, the disc has an embossing area in which each sector position information is preformatted as pit information at the sector start position.

In this case, since the location information of the actual sector exists only in the header area, it takes a lot of random access time.

That is, when actually moving to a specific position in the disc, the movement between the zone and the zone is jumped to the roughly approximate position by the sled motor by the sled motor, and the corresponding position is detected. It is a form of visit.

At this time, it is necessary to read the header area to know the current position. If the jumped position is more likely to be the data area than the header area, the time until reaching the header of the next sector is jumped to the data area. Becomes Ross.

As a result, the random access time is delayed.

In addition, after the jump, the read clock phase locked loop (PLL) becomes unstable, so it is necessary to wait for the spindle and read clock PLL to stabilize and then read the header area.

This information is also in the header, so the latency is longer.

In addition, other data may be overwritten in the disc defect and header areas. Thus, if the sector position information is damaged, the corresponding position is unknown and data of the sector cannot be reproduced.

On the other hand, another method for recording sector position information on a disc is to record a wobbling shape of a signal without any information in the data area while leaving the physical header area as it is.

This is in case the header is damaged and no header information is obtained. Even if the next sector is wrong, the number of previous wobble pulses is counted to guess the header of the next sector.

However, this method also has a waiting time until reaching the header of the next sector and a waiting time until the read clock PLL is stabilized after the jump when the jump to the data area during the track movement results in a long data read time during random access. There is a problem.

In addition, since physical data cannot be recorded in the physical header area, there is a disadvantage in that the recording area for recording data is reduced, and there is a problem in that it is not compatible with a read-only disc that does not use this format.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to record a signal having the absolute position information of the peak and valley corresponding to only one boundary surface of the peak and valley without a header area in wobble shape, thereby providing data during random access. The present invention provides a rewritable optical disc having a high lead time, a high data recording density, and being compatible with a read-only optical disc.

A feature of the rewritable optical disc according to the present invention for achieving the above object is that the absolute position information of a sector is wobbling on one boundary surface of the track of the hill valley of the rewritable optical disk having a signal track composed of hills and valleys. To record.

1 illustrates the format of a header area physically preformatted at a sector start position of a conventional rewritable optical disc.

2 shows a structure of a rewritable optical disc according to the present invention;

Explanation of symbols for main parts of the drawings

21, 22, 23, 24: interface of mountain or valley

L1, L2, ...: Mountain track G1, G2, ...: Goal track

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram showing the structure of a rewritable optical disc according to the present invention, in which a signal having absolute position information is recorded in a wobbling shape only at one interface between a peak and a valley.

In this case, since the wobble signals are all information having a specific position in the zone, that is, the wobble signals have absolute position information of the corresponding hill and valley, they do not need to be in-phased.

Further, the absolute position information included in the wobble signal is repeatedly recorded several times for one sector address length, whereby more stable position information can be obtained.

In other words, when actually moving to a specific position in the disk, the movement between the zone and the zone first jumps to the position where the pickup is roughly approximated by the sled motor.

At this time, since the absolute position information of the sector is repeatedly recorded in the zone in a wobble shape regardless of where the pickup is reached, the wobble signal of the corresponding position is read immediately so that the position of the position can be recognized as soon as the read clock PLL is stabilized. do.

Therefore, since there is no waiting time for reaching the header area of the next sector from the data area during random access, the read time is faster.

In addition, in the conventional case, since the absolute position information of a sector is recorded by a pit determined in the physical header area, other data may be overwritten in the header area, which may cause damage to the sector position information. Although there is a problem in which the position is unknown, in the present invention, since the wobble signal is used, the absolute position information of the sector is not damaged by a miswriting or the like.

The signal recorded in the wobble shape has absolute position information of the corresponding hill and valley, so that both the control information of the hill and the valley can be known.

For example, the position control information of L1 may be known using the difference between two signals 21 and 22, and the position control information of G1 may be known using the difference between two signals 23 and 24.

Therefore, since data can be recorded on both the mountain and valley tracks, the data recording density is improved.

As described above, according to the rewritable optical disc according to the present invention, the peaks and valleys repeatedly record the absolute position information of the sector in one wobbling shape on one interface without the physical header area, thereby reaching the header area of the next sector after the jump. By eliminating the waiting time until the random access time is faster, the absolute position information of the sector is not damaged.

In addition, since the wobble-shaped signal has the absolute position information of the hill and the valley together, the control information on the hill and the valley can be known. By using both tracks of the hill and the valley as the data recording area, the recording density is increased and the disk capacity is increased. This has a growing effect.

In addition, since the wobble shape is recorded in a soft format without a physical header area, compatibility with a disc for playback can be maintained.

Claims (3)

A rewritable optical disc having a signal track consisting of hills and valleys, wherein the absolute position information of the sector is recorded in a wobbling shape on one interface of the hill and valley tracks. The rewritable optical disc of claim 1, wherein the absolute position information of the sector is repeatedly recorded in a specific area. 2. The rewritable optical disc of claim 1, wherein absolute position information of a corresponding hill and valley sector is recorded together in the signal recorded in the wobbling shape.