Patent ID: 7266751
Filing Date: 2007-09-04
Classification: G11B,H04N

Abstract:
1. A data recording method, comprising the steps of: performing error correction encoding on input data for each encoding unit of a plurality of encoding units by use of a product code to provide error-correcting encoded data; recording said error-correction encoded data on at least one track of a recording medium in at least one encoding unit; sequentially recording a first sync-block on said at least one track of said recording medium, said first sync-block being constituted by adding an internal encoding parity to a data string of said input data constituting an internal encoding calculation data stream; and after said first sync-block is completely recorded, sequentially recording a second sync-block, said second sync-block being constituted by adding the internal encoding parity to a data string of an external encoding parity constituting the internal encoding calculation data stream, wherein in each item of said error-correction encoded data recorded on said at least one track of the recording medium in at least one encoding unit, the external encoding parity is calculated with the calculation being divided into a plurality of parts.