Optical recording medium

Details Optical recording medium Optical recording medium

1992-09-01

1996-03-05

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

054973678

ABSTRACT:
An optical storage medium provided with both a read-write area in which read-write data can be rewritably stored and a read-only area in which read-write data is previously stored in an unerasable manner. In the read-write area, a guide track is previously formed for tracking control, and read-write data is rewritably stored, for example photomagnetically, along the guide track. In the read-only area, data is stored along a read-only track that is offset over a portion of its length in a direction lateral to the track direction to represent the read-only data. This read-only data may be reproduced by detecting the laser light radiated from an optical pickup and reflected by the medium by a two-segment photodetector.

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