Offset nulling system for computer disk drives

Details Offset nulling system for computer disk drives Offset nulling system for computer disk drives

1988-03-28

1990-11-06

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, G11B 555, G11B 5596

Patent

active

049690590

ABSTRACT:
An offset nulling system is provided for use in computer disk drives to identify and compensate for actuator head position offset errors attributable to dc offsets of the disk drive control circuitry, thereby obtaining improved head alignment wiht a designated track on a memory storage disk or the like. The system includes a microcontroller adapted during a calibration mode to identify the position offset error and direction for selected tracks located respectively at radially inner and radially outer regions of the disk, and to adjust head position incrementally relative to those tracks to subsantially eliminate position offset error. Thereafter, during a normal operation mode of the disk drive, the microcontroller functions at the conclusion of a track seek step to adjust the head through a position offset compensation value and direction derived by interpolation of the position offset compensation value and direction identified during the calibration mode, in accordance with the specific track address.

REFERENCES:
patent: 4122503 (1978-10-01), Allan
patent: 4419701 (1983-12-01), Harrison et al.
patent: 4669004 (1987-05-01), Moon et al.
patent: 4731680 (1988-03-01), Moriyama et al.
patent: 4814909 (1989-03-01), Brown et al.
IBM TDB. vol. 19, No. 6, "Self-Calibrating Disk Storage Apparatus" Griffiths et al. 11/76, pp. 1991-1992.

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