Optical disk apparatus

摘要

An optical disk apparatus has a data recording circuit for recording user data in a data portion of a sector on an optical disk. The optical disk is formed with a plurality of tracks in a concentric circular shape or spiral shape on the surface thereof and is possible of data write based on a sector unit. Each track is segmented into a plurality of sectors. The apparatus also has a detection circuit for detecting a resynchro pattern recorded together with user data from a regenerative signal obtained from the data portion of a sector before recording user data in the sector, a count circuit for counting a number of resynchro patterns detected, and an overwrite preventive circuit for stopping recording data on the sector when a count value of the count circuit is not less than a predetermined value.