Patent ID: 6757861
Filing Date: 2004-06-29
Classification: G11B

Abstract:
A method for error control processing of a block of CD data, the method comprising:receiving a block of data having P rows of codeword symbols and Q columns of codeword symbols, where P and Q are selected positive integers; providing a number e(C1) indicating a number of errors in at least one C1 codeword of the data block; when the number e(C1) for at least N1 C1 codewords is larger than a selected C1 codeword threshold number e(thr;C1), providing a distinguishable symbol value in a variable number of at least e(thr;C1)+1 symbol positions for data in each of N2 rows within the data block, where N1 and N2 are selected positive integers; and interpreting occurrence of at least e(thr;C1)+1 distinguishable symbol values in at least one C1 codeword within the data block as indicating that the data block contains at least one C1 codeword with at least one uncorrectable error.