Optical disk, optical disk recording and reproducing apparatus a

Details Optical disk, optical disk recording and reproducing apparatus a Optical disk, optical disk recording and reproducing apparatus a

1987-07-16

1989-11-07

Faber, Alan

Dynamic information storage or retrieval

Simultaneous diverse types of storage or retrieval

369 59, 369 48, 369 58, 360 60, G11B 1112, G11B 2328

Patent

active

048797049

ABSTRACT:
In an optical disk system of the type including an optical disk for performing the recording and reproduction of data by use of a semiconductor laser and an optical disk recording and reproducing apparatus, an optical disk, optical disk recording and reproducing apparatus and copy preventive method for optical disks capable of preventing copying of the stored data from one optical disk on another. Irrespective of the kinds of optical disks, such as, read only-type optical disk, DRAW-type optical disk and erasable optical disk, each of the optical disks is provided in common with sectors from which data can be reproduced but not recorded on, i.e., data record-protected sectors and at least part of the stored data is stored in the record-protected sectors of the optical disk, thereby protecting the stored data from being recorded on the same address sectors of another recordable optical disk forming a part of the optical disk system.

REFERENCES:
patent: 4562577 (1985-12-01), Glover et al.
patent: 4583208 (1986-04-01), Verboom
patent: 4599717 (1986-07-01), Bracht et al.
patent: 4734796 (1988-03-01), Grynberg et al.
patent: 4734901 (1988-03-01), Murakami
patent: 4748611 (1988-05-01), Tsuyoshi et al.
IEEE Spectrum, vol. 23, No. 6, Jun. 1986, pp. 32-40.
IBM Tech. Dis. Bulletin, vol. 23, No. 2, Jul. 1980, pp. 554-555.

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