System for controlling disk drive by varying disk rotation speed when buffered data is above high or below low threshold for predetermined damping period

摘要

A disk drive motor control system which dynamically varies the speed of the motor in accordance with the desired data transfer rate is provided. This is accomplished by monitoring the transfer rate and lowering the speed when the transfer rate decreases and then raising the speed when the transfer rate increases. Hysteresis is preferably built-in so that rapid oscillations between the two speeds do not occur.