Error correction method in digital data storage device

Details Error correction method in digital data storage device Error correction method in digital data storage device

2005-07-08

2009-06-30

Abraham, Esaw T (Department: 2112)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

C714S708000, C714S774000

Reexamination Certificate

active

07555697

ABSTRACT:
A data error-detecting method for detecting errors before C1 decoding procedure is provided. First, a bit modulation is performed for modulating data channel bits obtained from an optical disk into 8-bit data. When the data channel bits is determined to introduce a legal mapping, an erasure bit having a first value is derived and tagged at the modulated 8-bit data, otherwise an erasure bit having a second value is derived and tagged at the modulated 8-bit data. After the 8-bit data being arranged as a codeword composed of 32 erasure bits respectively tagged with 32 8-bit data, counting the number of the modulated 8-bit data tagged with the erasure bit having the second value. When the counted number is less than 4, the codeword composed modulated 8-bits data tagged with the erasure bits having the second value can be corrected.

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