Western Digital Technologies, Inc.

Yakov M Lifschitz

Guoxiao Guo

Duc T Phan

Chuanwen Ji

Min Chen

Stanley H Shepherd

Yanan Huang

Hengchang Guo

Jason Laks

A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo bursts. The head is positioned at a first radial location over the disk and a first burst correction value is generated by reading at least one of the servo bursts. The head is positioned at a second radial location over the disk and a second burst correction value is generated by reading at least one of the servo bursts. The head is positioned at a third radial location over the disk and the first burst correction value and the second burst correction value are written at the third radial location. The head is servoed over the disk by reading the first and second burst correction values.

Data storage device writing multiple burst correction values at the same radial location

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.

Polarity detection of piezoelectric actuator in disk drive

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San Jose, CA, United States of America

Yakov M Lifschitz