Servo track centering for magnetic disc read/write head

Details Servo track centering for magnetic disc read/write head Servo track centering for magnetic disc read/write head

1988-03-14

1990-03-20

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, G11B 5596, G11B 2110

Patent

active

049106163

ABSTRACT:
A magnetic storage disc 1 has a plurality of concentric data tracks, with circumferentially staggered servo centering signals B, C recorded flanking each track in a sector shaped region of the disc. A rotationally driven spindle 2 positionally clamps the disc such that an index mark on the spindle base is sensed by a pickup 5 immediately following the servo sector. The pickup signal is reliably supplied to a host computer via a timer 16, a microprocessor 12 and a R/W interface 15 to enable read/write operations on an accessed track. A delayed output from the timer, at the end of the data portion of the track and at the beginning of the servo sector, terminates such operations, enables the R/W head 3 to be stepped to a next addressed track by an actuator 4 with coarse positioning, and initiates the accurate centering of the head by an open loop servo.

REFERENCES:
patent: Re32075 (1986-01-01), Harrison et al.
patent: 4419701 (1983-12-01), Harrison et al.

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