Shih-Ming Shih - San Jose CA Richard J. Spanel - San Jose CA Kenneth G. Yamamoto - San Jose CA Mantle M. Yu - San Jose CA
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
G11B 2108 G11B 2110
US Classification:
360 7804
Abstract:
A digital servo control system in a data recording disk file has a single processor which generates the control signal to the actuator at two different rates, depending on whether the read/write head is being moved between data tracks or is following a specific track. A sampling clock generator receives servo timing information from a recorded servo disk surface and generates interrupt signals to the processor at predetermined frequencies selected by the time required for the processor to run the algorithm which generates the control signals. Upon receipt of a seek command to move the head of a target track, or a predetermined head position error signal indicative of arrival of the head to the target track, the microprocessor enables or disables appropriate interrupts so as to select one of the appropriate rates for generating the control signals. The digital servo control system thus allows servo position information to be sampled at a higher frequency during track following.