Enhanced read retrial scheme
AssigneeMaxtor Corporation
InventorLih-Jyh Weng
Life of this patent
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Abstract
A read retrial mechanism which increases the error correction ability of a decoding operation by converting errors to erasures is presented. The mechanism reads at least two copies of a code word from memory and compares corresponding symbols to identify symbol locations for which corresponding symbols are of unequal value. At least one of the code word copies is decoded by an error-erasure decoding operation using the symbol locations identified by the comparison as erasures.
Claims22
A method of reading a stored code word, the code word having a plurality of symbols and each symbol in the plurality of symbols having a symbol location, comprising:
- reading at least two copies of the code word;
- comparing corresponding symbols in the at least two copies to determine which corresponding symbols are unequal;
- identifying symbol locations for the unequal corresponding symbols;
- and
- performing a decoding operation to decode one of the at least two copies using the identified symbol locations.
An apparatus for reading a stored code word, the code word having a plurality of symbols and each symbol in the plurality of symbols having a symbol location, comprising:
- a stored computer program in memory instituting the steps of:
- reading at least two copies of the code word;
- comparing corresponding symbols in the at least two copies to determine which corresponding symbols are unequal;
- identifying symbol locations for the unequal corresponding symbols;
- and
- performing a decoding operation to decode one of the at least two copies using the identified symbol locations.
Dependencies are inferred from the claim text.