Actuator driving apparatus and magnetic disk drive system with a smaller number of high power amplifiers than actuators

摘要

In a magnetic disk drive apparatus having a plurality of actuators, or a magnetic disk drive system constructed of a plurality of head disk assemblies (HDA's); a magnetic disk drive apparatus or system in which the actuators included in the above apparatus or system can be arbitrarily and selectively coupled with a plurality of access control circuits and high power amplifiers that are smaller in number than the actuators.