Double-sided recordable optical disk suitable for a substituting

Details Double-sided recordable optical disk suitable for a substituting Double-sided recordable optical disk suitable for a substituting

1994-02-03

1995-04-11

Pascal, Robert J.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 47, 369 4437, G11B 1722, G11B 700

Patent

active

054065348

ABSTRACT:
An optical disk apparatus for an optical disk having two sides for which data can be simultaneously recorded. Each of the two sides includes a spare area for alternative recording. In the optical disk apparatus, a series of data to be recorded is distributed into first data for the first one of the two sides and second data for the second one of the two sides. The apparatus of this invention detects any defective sector into which data cannot be recorded which occurs in either one or both sides during the simultaneous recording. If there is a defective sector in one side, an alternative recording process is performed for alternatively recording data that was to be recorded into the detected defective sector, and data to be recorded into a sector in the other side corresponding to the defective sector, into alternative sectors in the spare areas of the two sides, respectively. Also, defect information relating to the defective sector is recorded into a predetermined area of the optical disk. When the first data and the second data are reproduced, the first and second data are integrated and rearranged, so as to reproduce the series of data.

REFERENCES:
patent: 5132953 (1992-07-01), Matsubayashi
patent: 5253242 (1993-10-01), Satoh et al.
M. Onoue et al., Optical Disk Technique, pp. 230-233, Feb. 10, 1989, "1.8.4. Alternative Area" with partial English translation.

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