Sector mis-synchronization detection method

Details Sector mis-synchronization detection method Sector mis-synchronization detection method

H - Electricity

03

M

354/67, 352/19.6

H03M 13/00 (2006.01) G11B 20/18 (2006.01) H03M 13/33 (2006.01)

Patent

CA 1314977

ABSTRACT A data encoder is set to an initial condition by encoding preliminary symbols. The encoder is then used to encode the data to generate ECC symbols. The data and the generated ECC symbols are then recorded on a disk as code words. Thereafter, when a data code word is read it is again encoded in the initialized encoder to generate new ECC symbols. If the data read from the disk is one or more symbols out of synchronization, errors due to the initial condition will be found. The locations of the errors due to mis-synchronization will be in symbols corresponding to the initial condition, that is, in the preliminary symbols and beyond the boundary of the code word data, indicating the synchronization error. Alternatively, the locations of errors due to defects in the disk or misinterpretation of the data signal are within the code word data. Thus a mis- synchronization of one of more full symbols can be readily detected.

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