Optical disc having protective cover

Details Optical disc having protective cover Optical disc having protective cover

1986-03-04

1987-06-09

Richardson, Robert L.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, 369 14, G11B 2300, G11B 700

Patent

active

046726004

ABSTRACT:
An optical disc assembly has an optical disc and a protective cover. The optical disc has a surface adapted to have optically recorded thereon data consisting of a series of laser ablated pits recorded as a series of concentric data tracks. The pits have small size and high surface density. The protective cover has a permanent optical recording at one surface thereof consisting of a series of visible marks. The marks are an order of magnitude larger than the pits and have a much lower surface density. Memory data is recorded on the optical disc and positional data, comprising a map of the memory data surface, is recorded on the cover. This allows the use of separate positional data and memory data monitoring channels which facilitates the recording of a blank optical disc and subsequent memory data access.

REFERENCES:
patent: 4094013 (1978-06-01), Hill et al.
patent: 4108365 (1978-08-01), Hughes
patent: 4331966 (1982-05-01), Moe
patent: 4385372 (1983-05-01), Drexler
patent: 4387381 (1983-06-01), Bell
patent: 4450553 (1984-05-01), Holster et al.

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