OPTICAL DISK SYSTEM WITH IMPROVED PLAYABILITY

摘要

An optical disk drive ( 50 ) comprises a radial servo system ( 70 ) for driving the position of an optical head ( 52 ) for scanning an optical disk ( 10 ) comprising at least one recording track ( 11; 12, 13 ), a focus servo system ( 80 ) for controlling the focussing of an optical beam, and a data retrieval system ( 90 ) for regenerating the digital data recorded on disk. Operative parameters of the radial servo system ( 70 ) and/or focus servo system ( 80 ) and/or data retrieval system ( 90 ) are frozen or are set to predetermined values as soon as the optical head ( 52 ) reaches a predetermined location ( 17 ) along a current track ( 12; 13 ) which is determined on the basis of a defect entry location ( 17 ) along a previous track ( 11; 12 ).