Magnetic disc drive system having automatic offset and gain adju

Details Magnetic disc drive system having automatic offset and gain adju Magnetic disc drive system having automatic offset and gain adju

1987-12-16

1990-03-06

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 7807, 360 7812, G11B 555, G11B 5596

Patent

active

049071092

ABSTRACT:
A magnetic disc drive system includes a magnetic head, an actuator for moving the magnetic head, a control current detection circuit detecting a control current flowing through the actuator, a position signal generation circuit generating a position signal of the magnetic head, a speed control unit effecting a seek control, and a position control unit effecting a fine position control after completion of the seek control. The magnetic disc drive system includes units which, immediately upon receipt of a power supply and before receipt of a seek command, measure one or more position offset values along one or more cylinders on a magnetic disc. This is accomplished by detecting the control current from the control current detection circuit when the position of the magnetic head is controlled under the fine position control, and calculating one or more offset correction values and outputting the calculated offset correction values to the speed control unit and the position control unit. The magnetic disc drive system may further include an automatic speed control gain adjustment unit, which after completion of the offset correction value calculation, determines a speed control gain used in the speed control unit by seeking the magnetic head to a predetermined cylinder under application of the calculated offset values and measuring a time for the seek which meets a requirement of a reference seek time.

REFERENCES:
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4594622 (1986-06-01), Wallis

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