Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-09-01
1998-06-30
Young, W. R.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369111, 3692753, G11B 700
Patent
active
057744394
ABSTRACT:
The optical-disk recording and reproducing apparatus is provided with an optical head, a reproduction circuit, a detector circuit, a servo circuit, a recording circuit, and a controller. The controller among them performs such control that information is recorded and reproduced on only either lands or grooves in a region where file management information is recorded and reproduced, while information is recorded and reproduced on both lands and grooves for a plurality of tracks or for every zone in a data region, in the case of a land and groove recording optical disk. In the case of a land or groove recording optical disk, the controller performs such control that information is recorded and reproduced at alternate tracks in a region where file management information is recorded and reproduced, while information is continuously recorded and reproduced in the data region. As an optical disk, the track pitch in the region where the file management information is recorded and reproduced is made wider than the diameter of the laser beam.
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Miyagawa et al., "Improvement of track density by land and groove recording on phase change optical disk", Extended Abstracts (The 40th Spring Meeting, 1993); The Japan Society of Applied Physics and Related Societies, May 1993.
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Ogami et al., "Optical Disk Technique", Recording Format, pp. 222-223.
Aoki Kazuhiro
Ito Motoshi
Oohara Shunji
Matsushira Electric Industrial Co., Ltd.
Young W. R.
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