Method and system for a magnetic disk drive employing a quadrati

Details Method and system for a magnetic disk drive employing a quadrati Method and system for a magnetic disk drive employing a quadrati

1987-06-29

1989-10-31

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 7707, 360 7811, G11B 555, G11B 5596

Patent

active

048781355

ABSTRACT:
A head positioning system for use with a magnetic disk with outer, middle and inner servo tracks which are radially separated by data tracks. The head positioning system includes a measuring element for measuring deviations of the magnetic head from the outer, middle and inner servo tracks by reading the servo information recorded on each of the servo tracks and generating first, second and third deviation values. The head positioning system also includes a determining element which determines an offset correction value for a targtet data track included in the data tracks in accordance with a quadratic compensation function and the first, second and third deviation values. A fine positioning element positions the magnetic track of the target track according to the offset correction value.

REFERENCES:
patent: RE32075 (1986-01-01), Harrison et al.
patent: 4122503 (1978-10-01), Allan
patent: 4697213 (1987-09-01), Kitamura
patent: 4731680 (1988-03-01), Mariyana
IBM TDB, vol. 19, No. 6, "Self-Calibrating Disk Storage Apparatus" Griffiths et al., 11/76, pp. 1991-1992.
IBM TDB, vol. 17, No. 6, "Correction of Data Track Misregistration in Servo Controlled Disk Files", Paton, 11/74, pp. 1781-1783.

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