| 摘要 |
A disk drive device capable of satisfactorily detecting address information recorded by land prepits even after data is recorded is provided. When address information recorded by land prepits is detected from a disk on which lands and grooves as recording tracks are formed and address information is recorded as land prepits on the lands, a window signal is generated by binarizing a push-pull signal (window generation circuit 31 ), the push-pull signal is integrated in a period based on the window signal (integration circuit 32 ), and the address information by the land prepits is extracted from the integrated signal ( 33, 34, 35 , and 26 ).
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