Patent ID: 6751771
Filing Date: 2004-06-15
Classification: G11B

Abstract:
In a device adapted for the retrieval and processing of data stored on an optical disk in a DVD format, the retrieval and processing of data 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 and parts of plural sectors encoded within each outer code, a method of correcting and detecting errors in the data, the method comprising:passing the sector through a CRC generator to generate an initial error detection value for the sector; comparing the initial error detection value to a target error detection value to determine if errors are present in the sector; responsive to the process of comparing the initial error detection value to the target error detection value, determining whether or not one or more error correction operations are to be performed on data wholly or partially within the sector, the determining performed on a sector by sector basis; subsequently descrambling the data within the sector and outputting the data within the sector.