Patent ID: 6809998
Filing Date: 2004-10-26
Classification: G11B

Abstract:
An optical disk drive for handling an optical disk in which a sector as a recording unit is formed by a header region where pre-formatted data including a sector mark for indicating a leading position of a sector and a data recording region subsequent to the header region, and the header region has a recording density different from the recording density of the data recording region, comprising:a data reproduction device for reproducing the pre-formatted data from the header region in the sector, and for reproducing data from the data recording region of the sector; a clock generator for generating a reference clock with a frequency corresponding to a reproduction frequency of the data reproduced from the data recording region in the sector; a divider for dividing the reference clock in accordance with the ratio between the recording density of the header region and the recording density of the data recording region, so as to generate a sampling clock with a frequency corresponding to the reproduction frequency of the pre-formatted data reproduced from the header region; and a sector mark detector for detecting the sector mark from the pre-formatted data reproduced in the data reproducing device, by use of the sampling clock.