Head positioner and disk drive using the same

摘要

A head positioner comprises a degradation detecting unit for detecting degradation of a fine motion actuator based on current flowing through a piezo element constituting the fine motion actuator and a performance recovering unit for repairing the degradation when the degradation is detected. A fine motion driver has a function of generating a fine motion driving signal, a function of generating a predetermined voltage used for detecting the degradation, and a function of outputting a high voltage signal used for repairing the degradation. Therefore, the present invention can provide a head positioner for realizing stable positioning control for a long time even when degradation of the positioning performance is generated by an electric short circuit or the like, and provide a disk drive.