Patent ID: 7570446

Claim:
A disk drive comprising: a head provided with a write head to record data on a disk and a read head to read out data recorded on the disk; and a read write control unit which controls the write and read done by the head; wherein the disk has servo areas in each of which common servo data to be used both during write and during read, and read servo data to be used during read, are recorded; wherein the common servo data including sync data for synchronization and the read servo data including a synchronization signal are recorded in each servo area in such a manner that the read servo data is read after the common servo data; wherein the head is structured in such a manner that the write head reaches each servo area earlier than the read head when data is recorded in data recording areas each of which are arranged between adjacent servo areas; and wherein the read write control unit starts the write head recording data in a data recording area before the read head reads out read servo data from the servo area.