Dennis L Howe

US Patent:

61123242, Aug 29, 2000

Filed:

Feb 2, 1996

Appl. No.:

8/594604

Inventors:

Dennis George Howe - Tucson AZ
Babak Tehranchi - Tucson AZ

Assignee:

The Arizona Board of Regents acting on behalf of The University of
Arizona - Tucson AZ

International Classification:

G11C 2900

US Classification:

714763

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.

US Patent:

63113058, Oct 30, 2001

Filed:

Mar 2, 1998

Appl. No.:

9/032905

Inventors:

Baruch Sollish - Emmanuel, IL
Dennis Howe - Tucson AZ

Assignee:

T.T.R. Technologies Ltd. - Kfar Saba

International Classification:

H03M 1300

US Classification:

714784

Abstract:

A method and system for overriding error correction capabilities of digital optical media is provided. The overriding of the error correction codes (ECC) is accomplished by causing a non-correctable pattern of erroneous symbols to occur in the ECC codeword. Specific redundancy symbols are replaced with invalid symbols. The non-correctable error pattern is recognized by the ECC decoder as being non-correctable and the ECC decoder does not attempt to change the values of any symbols of an ECC codeword that is contaminated by the detectable non-correctable error pattern.