Method and system for overriding error correction
AssigneeT.T.R. Technologies Ltd.
InventorsBaruch Sollish, Dennis Howe
Life of this patent
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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.
Claims28
A method for overriding error correction on a digital optical medium, the method comprising the steps of:
- prior to EFM encoding, determining the error-correction code codeword in which a non-correctable predetermined symbol is to be contained and causing a non-correctable pattern of erroneous symbols to occur in the error-correction code codeword;
- and
- following EFM encoding, storing the predetermined symbol and said pattern of erroneous symbols on the digital optical medium.
A method for overriding error correction on a digital optical medium, said digital optical medium having a lead-out area with a plurality of sectors, the method comprising the steps of:
- prior to EFM encoding, determining an error-correction code codeword in which a non-correctable predetermined symbol is to be contained, and causing a non-correctable pattern of erroneous symbols to occur in the error-correction code codeword;
- and
- following EFM encoding, locating the final sector of the lead-out area;
- and storing at least one non-correctable predetermined symbol in said final sector.
A digital optical medium, configured for overriding error correction, said digital optical medium comprising:
- at least one sector having at least one non-correctable predetermined symbol located therein;
- wherein, prior to EFM encoding, said at least one non-correctable predetermined symbol is replaced by one of a non-correctable pattern of erroneous symbols created prior to EFM encoding.
A system for overriding error correction on a digital optical medium, said digital optical medium comprising at least one error-correction code codeword, said at least one error-correction code codeword containing said at least one non-correctable predetermined symbol and a non-correctable pattern of erroneous symbols, said system comprising:
- a determinator to determine the error-correction code codeword in which said predetermined symbol is to be contained;
- an invalid symbol generator for creating erroneous symbols prior to EFM encoding;
- and
- a replacing unit to replace said predetermined symbol by one of said erroneous symbols prior to EFM encoding and
- following EFM encoding, a storage unit to store said predetermined symbol and said erroneous symbols on said digital optical medium.
Dependencies are inferred from the claim text.