Magnetic disk drive having programmable sector pulse generator a

Details Magnetic disk drive having programmable sector pulse generator a Magnetic disk drive having programmable sector pulse generator a

1994-07-25

1996-04-09

Callahan, Timothy P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 7705, 360 7708, G11B 2102, G11B 5596

Patent

active

055067352

ABSTRACT:
In a magnetic disk drive system in which a transducer addresses a plurality of tracks on a rotating magnetic disk, a programmable sector pulse generator responds to rotation of the magnetic disk and to an indication of the location of a track to be addressed by the transducer to generate sector pulses identifying a succession of sectors along the track. The indication of location of the track is provided by a central processing unit which divides the tracks into a plurality of concentric zones and then programs the sector pulse generator to execute different counts of timing pulses derived from the rotating magnetic disk in accordance with the particular zone in which the selected track is located. The central processing unit determines the zone of the selected track by counting track crossings of the transducer relative to a reference track, thereby eliminating the need to record zone identifying information in the tracks. The programmable sector pulse generator responds to a track seek command identifying a track in a different zone by changing the count in connection with sector pulse generation within a small fraction of the time required for the magnetic disk to undergo a revolution.

REFERENCES:
patent: 4488187 (1984-12-01), Alaimo
patent: 5012363 (1991-04-01), Mine et al.
patent: 5109307 (1992-04-01), Sidman
patent: 5307218 (1994-04-01), Kitamura et al.

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