Polarity detection of piezoelectric actuator in disk drive

摘要

Determining a polarity of a piezoelectric (PZT) actuator of a disk drive including a disk for storing data and a head for reading and writing data. A test signal is injected into the PZT actuator and a position signal is received which indicates a position of the head over the disk resulting from the test signal. A test compensation signal is generated based on the received position signal and the polarity of the PZT actuator is determined based on a phase of the generated test compensation signal.

主权项

1. A disk drive comprising:
a disk for storing data; an actuator arm; a head connected to the actuator arm for reading data from the disk and for writing data on the disk; a piezoelectric (PZT) actuator located between the actuator arm and the head for positioning the head over the disk; and a controller configured to:
inject a test signal into the PZT actuator;receive a position signal indicating a position of the head over the disk resulting from the test signal;generate a test compensation signal based on the received position signal; anddetermine a polarity of the PZT actuator based on a phase of the generated test compensation signal.