Rewritable optical disc

Details Rewritable optical disc Rewritable optical disc

1992-06-02

1994-02-01

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 53, G11B 390

Patent

active

052837793

ABSTRACT:
A rewritable optical disk has a user recording area in which data is stored in a plurality of sectors, and a written sector flag zone radially separated from the user recording area. The written sector flag includes a plurality of written sector flags, each flag corresponding to one sector in the user recording area. Each written sector flag indicates by its setting whether or not information data has been written in its corresponding sector in the user recording area. The written sector flags are single bits, and are written using error correction. The written sector flags are written in sectors in the written sector flag zone. If a sector is determined to be "no good" and cannot be used for writing written sector flags, the written sector flags that would be written in the "no good" sector are written in the next good sector following the "no good" sector. An apparatus for writing and reading an optical disk with a written sector flag zone reads the written sector flags in the written sector flag zone. A write inhibitor, responsive to the read written sector flags, inhibits writing in a sector indicated as having data written in it. The apparatus is responsive to the write inhibitor and writes information data on the disk in a sector in which writing is not inhibited. The apparatus then writes the written sector flag corresponding to the sector to indicate that information data has been written in the sector.

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patent: 4937804 (1990-06-01), Ishihara
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