Compensating for variations in torque capability of voice coil m

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

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360 7704, 360 7806, 369 32, G11B 5596

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053051602

ABSTRACT:
A method for compensating for position and component induced variations in the acceleration and deceleration capabilities of a voice coil actuator in a disc drive, comprising the steps of dividing the discs radially into a plurality of zones, testing the acceleration and deceleration capability of the disc drive in each zone by performing specially controlled seeks in both inward and outward directions in each zone, comparing the result of these specially controlled seeks with a calculated nominal or desired result, and calculating a compensation factor for each zone which is applied by the servo system to all subsequent seek and track following operations.

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