Direct access compact disc, writing and reading method and devic

Details Direct access compact disc, writing and reading method and devic Direct access compact disc, writing and reading method and devic

1996-02-02

2000-08-29

Grant, William

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

39550005, 714752, 714756, 714758, 714762, 714766, 714799, 711 4, 711112, 707205, 369 53, 369 54, G11C 2900

Patent

active

061123242

ABSTRACT:
A system that redefines how data is distributed on a conventional writable compact disc (CD-R/E). A rearrangement of the data on the disc provided during the writing operation preserves eight-to-fourteen channel frames and the control and display (C&D) channel and burst error mitigation while providing a direct access storage device (DASD) format and capability. The CD-DASD format is suitable for preformatting the CDs and has constant size sectors recorded contiguously along the spiral track. Each sector is independently addressable and synchronous with the C&D data word and ATIP channel words on the CD-R disc. The system uses the components of a conventional CD device and a mapping controller address translator to encode and decode the data bytes using a conventional CIRC encoder/decoder. A rectangular product code of C1 and C2 CIRC subcodes is provided that is interleaved to mitigate the effects of handling. The system provides for locking in on the changing data frequency that occurs when moving between spirals of the CD allowing reading and writing to occur while the CD is coming to the proper speed.

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