Thermal offset compensation for high density disk drives

Details Thermal offset compensation for high density disk drives Thermal offset compensation for high density disk drives

1990-09-28

1993-02-09

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7704, 360 7707, G11B 5596

Patent

active

051856816

ABSTRACT:
A thermal offset compensation system is provided for use in a computer disk drive unit have a dedicated servo surface on one of a plurality of memory storage disks. The disk drive unit has a plurality of electromagnetic heads displaced as a group relative to respective storage surfaces on the disks to read and/or write data in concentric tracks. One of the heads comprises a servo head for reading servo data prerecorded onto the dedicated servo surface to align the remaining heads relative to corresponding cylinders of data tracks. Thermally induced offsets of the data heads relative to the servo head are measured on one or more calibration cylinders located in the inner and outer guard bands of each storage surface. The average offset of the data heads, taken collectively, is determined and subsequently compensated-for when any data head is utilized to read or write data on a selected track. The thermal compensation offset is determined during a spin-up operation of the disk drive unit, and then periodically thereafter upon receipt of any host command by the disk drive unit.

REFERENCES:
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A. Paton, IBM Technical Disclosure Bulletin, vol. 17, No. 6, Nov. 1974, "Correction of Data Track Misregistration in . . . " pp. 1781-1783.

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