Optical disk having R/W and worm area

Details Optical disk having R/W and worm area Optical disk having R/W and worm area

1992-04-21

1994-11-01

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 430945, 346 76L, 3461351, B32B 300

Patent

active

053606515

ABSTRACT:
An optical storage arrangement is provided where a unified optical disk, or other optical media, has separate Read/Write (R/W) and Write Once Read Many (WORM) areas. A Read/Write head or transducer selectively records data only once in the WORM area but records and re-records data in the R/W area. Both areas can be selectively read repetitively. The WORM area is used to store data records and the R/W area contains directories for the data records recorded in the WORM area.

REFERENCES:
patent: 4575827 (1986-03-01), Kulakowski
patent: 4891305 (1990-01-01), Oba et al.
patent: 5206003 (1993-04-01), Westerhout
Patent Abstracts of Japan, Abstract--vol. 8, No. 179 (P-295) 17 Aug. 1984 & JP-A-59 071 144 (Canon K K) 21 Apr. 1984.
Patent Abstracts of Japan, Abstract--vol. 7, No. 224 (P-227) 5 Oct. 1983 & JP-A-58 114 343 (Fujitsu K K) 7 Jul. 1983.
Patent Abstracts of Japan, Abstract--vol. 12, No. 125 (P-691) 19 Apr. 1988 & JP-A-62 250 532 (TEAC) 31 Oct. 1987.
Patent Abstracts of Japan, Abstract--vol. 16, No. 58 (P-1311) 13 Feb. 1992 & JP-A-03 256 244 (Ricoh Co) 14 Nov. 1991.
Patent Abstracts of Japan, Abstract--vol. 12, No. 194 (P-713) 7 Jun. 1988 & JP-A-62 298 982 (Hitachi) 26 Dec. 1987.
Patent Abstracts of Japan, Abstract--vol. 10, No. 147 (P-460)(2204) 29 May 1986 & JP-A-60 263 353 (Matsushita Denki Sangyo) 26 Dec. 1985.

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