Patent ID: 7616543
Filing Date: 2009-11-10
Classification: G11B

Abstract:
1. A disk drive apparatus for recording and reproducing data on a disk recording medium, said disk recording medium having a groove formed in a spiral fashion to form a track on the disk, and said disk recording medium including: a recording and reproducing area in which address information is recorded by wobbling of said groove and the track formed by said groove is used for recording and reproducing mark information; and a reproduction-only area in which prerecorded information is recorded by wobbling of said groove, said disk drive apparatus comprising: head means for irradiating said track with a laser and obtaining a reflected light signal; wobbling extracting means for extracting a signal related to wobbling of said track from said reflected light signal; mark information extracting means for extracting a signal related to the mark information from said reflected light signal; address decoding means for performing minimum shift keying (MSK) demodulation of said signal related to the wobbling extracted by said wobbling extracting means and decoding said address information at a time of reproduction in said recording and reproducing area; mark decoding means for decoding said signal related to the mark information extracted by said mark information extracting means and thereby obtaining information recorded as the mark information at the time of the reproduction in said recording and reproducing area; and prerecorded information decoding means for decoding said signal related to the wobbling extracted by said wobbling extracting means and thereby obtaining said prerecorded information at a time of reproduction in said reproduction-only area.