Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1996-11-12
1999-11-02
Neyzari, Ali
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
3692751, G11B 724
Patent
active
059783508
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an optical disc of the sample servo system and a driving device therefor.
BACKGROUND ART
There has hitherto been known an optical disc system for recording/reproducing various data by scanning a concentrically or spirally extending track on the disc by a laser beam, in which the optical disc is driven at a constant linear velocity (CLV) or at a constant angular velocity (CAV) for recording/reproducing the data. There has also been known an optical disc system of a continuous servo system in which tracking control is performed using a continuous pre-groove formed along the track, or of a sample servo system in which tracking control is performed using discrete servo areas formed on the track.
Among known types of the optical discs, there are a recordable RAM disc, such as a replay-only ROM disc, a write-once disc or a magneto-optical disc (MO disc) and a so-called partial ROM disc having both ROM and RAM areas.
An optical disc system, handling such optical disc, is configured for reading the parameter information for the medium recorded on a phase encoded part (PEP) provided on an inner rim of the optical disc as prescribed in ISO MO 5.25 inch standards and for reading the control information from the control track based upon the control information for carrying out the control operation responsive to the control information.
With the continuous composite servo system (CCS system) standardized in ISO, servo data is affected by data per se. That is, if data recording density is increased, system clocks can be reproduced with increasing difficulties, such that it becomes difficult to achieve high recording density. Besides, since the groove and pits must be cut simultaneously, it is difficult to produce a ROM disc or a partial ROM disc.
In addition, with the conventional optical disc, a dedicated decoding circuit has been required for reading out the parameter information recorded on the PEP. Since the PEP lacks in the address information, the pickup position cannot be identified. Since the PEP and the recording area for data per se are different in formats, the two areas need to be demarcated from each other via a gap.
It is therefore an object of the present invention to provide an optical disc of a sample servo system of high capacity and high performance, and a driving system therefor.
It is another object of the present invention to provide an optical disc in which the parameter information can be read without requiring a dedicated decoding circuit and in which the pickup position can be identified.
DISCLOSURE OF THE INVENTION
The present invention provides an optical disc having a plurality of substantially concentrically extending tracks, each track including a plurality of segments having a servo area having servo pits giving the servo information to a disc drive and a data area. There is provided a discrimination mark giving the information for identifying a segment by the recording position in the servo area.
With the optical disc of the present invention, the segments include a data segment for recording user data and an address segment for specifying an address of the data segment. The discrimination mark discriminates the data segment from the address segment.
With the optical disc of the present invention, a sector is formed by a plurality of segments and a segment at a leading end of the sector is identified by the discrimination mark.
With the optical disc of the present invention, a sector is formed by a plurality of segments and a segment at a leading end of the sector and a directly previous segment are identified by the discrimination mark.
With the optical disc of the present invention, the segments include a data segment for recording user data and an address segment specifying an address of the data segment, and a plurality of said segments make up a sector. The data segment and the address segment may be discriminated from each other by the discrimination mark and the segment constituting the leading end of the sector and the directly pr
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Fujita Goro
Otsuka Satoshi
Tobita Minoru
Yamagami Tamotsu
Neyzari Ali
Sony Corporation
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