Optical disk apparatus for reading data from zones of an optical

Details Optical disk apparatus for reading data from zones of an optical Optical disk apparatus for reading data from zones of an optical

1994-09-27

1996-08-06

Young, W. R.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 50, 369 54, 369 58, 369 48, G11B 7085

Patent

active

055441343

ABSTRACT:
The optical disk formatted by the M.CAV mode has a plurality of tracks for recording data, arranged in a substantially coaxial manner, which are divided into a plurality of zones in its radial direction. Each track is divided into a plurality of sectors, each of which being handled as a unit region for recording data. The tracks in the same zone have the same number of sectors, and tracks in different zones have a different number of sectors. In the header region of each sector, the header data for specifying the sector is prerecorded, and a data field for recording data is provided following this header. In an apparatus for reading out data on a disk formatted as described above, data is read out from the data field based on a data clock having a frequency which varies from one zone to another. When a track of a different zone is accessed, the data of the track is read out based on the clock for reading the target track. It is then demodulated based on the data clock recorded in the header data, and the access operation is carried out once again.

REFERENCES:
patent: 5193034 (1993-03-01), Tsuyoshi et al.
patent: 5432762 (1995-07-01), Kubo

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