Head positioning control apparatus for a data storage device

Details Head positioning control apparatus for a data storage device Head positioning control apparatus for a data storage device

1990-07-25

1992-12-01

Smith, Jerry

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 369 4429, G11B 555, G11B 2108

Patent

active

051683989

ABSTRACT:
In a servo system for a hard disk drive, an integrating circuit for eliminating an offset of a head has its capacitor charged to an extent corresponding to an offset amount, at a time of a track following control operation, before an integral action is done. The integrating circuit performs the integral action through the utilization of the charged capacity to eliminate the offset amount of the head. A CPU retrieves an initially prepared offset table for one of voltage level data corresponding to the offset amount which is determined in accordance with a head's destination track. A D/A converter converts the voltage level data which comes from CPU to a voltage and supplies it to the capacitor in the integrating circuit.

REFERENCES:
patent: 4086636 (1978-04-01), Cizmic et al.
patent: 4949201 (1990-08-01), Abed
patent: 5062023 (1991-10-01), Squire

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