Patent ID: 8166369

Claim:
A method of correcting and detecting errors in data stored on an optical disk in a DVD format, retrieval and processing of the data stored on the optical disk in the DVD format including inner and outer code error correction for a Reed-Solomon product like code and an error detection process for evaluating an extent of errors in a sector of data, the sector of data encoded within a plurality of inner codes, parts of plural sectors encoded within each outer code, the method comprising: calculating an initial error detection value for data within the sector; performing an error correction operation on the data within the sector and determining an updated, intermediate error detection value responsive to the error correction operation; using a target error detection value and one of the initial error detection value and the intermediate error detection value to determine that the sector does not include errors; processing an outer code to provide a set of error patterns and error locations; and determining if any of the error locations are for data within the sector and not correcting data corresponding to the error locations within the sector.