Patent ID: 6172838
Filing Date: 2001-01-09
Classification: G11B

Abstract:
A disk unit intended to record a sector mark at a leading position of each of a plurality of sectors which are obtained by recording servo frames at prescribed intervals on tracks of a disk medium and dividing an interval between said servo frames and upon read operation or write operation relative to the disk medium, generate a write gate signal or a read gate signal on the basis of a sector pulse derived from a read of the sector mark, said disk unit comprising:a gap region provided at a trailing position of each sector of the disk medium and having a duration corresponding to an encode loss attributable to a write operation;a write gate generation unit for generating in a write operation, a write gate signal in synchronism with the sector pulse, and interrupting the write gate signal in response to a detection signal of said gap region; anda read gate generation unit for generating, in read operations read gate signal in synchronism with the sector pulse with a delay of time corresponding to decode loss attributable to a read operation, and interrupting the read gate signal in response to a signal which is obtained by delaying said detection signal of said gap region by said time corresponding to the decode loss.