Seagate Technology Incorporated

Western Digital Technologies, Inc.

Huaan Zhang

Xiao Z Wu

Alexei Hiram Sacks

Barmeshwar Vikramaditya

David D Terrill

The disclosure is related to apparatuses and methods for characterizing and compensating for curvature in a write field generated by a data storage device transducer. In some embodiments, the curvature of a write field generated by a data storage device transducer may be characterized. Some embodiments can include a circuit to apply a phase compensation value based on a deterministic phase offset value, which may correspond with the write field curvature characterization.

Transducer write field curvature characterization and compensation

A data storage device is disclosed comprising a head actuated over a disk. A plurality of data tracks on the disk are first written, and a metric representing a spacing between at least two of the first written data tracks is generated. At least two of the plurality of data tracks are rewritten based on the generated metric such that the rewritten data tracks comprise a more equal spacing compared to the first written data tracks.

Data storage device writing tracks on a disk with equal spacing

A data storage device for retrieving data includes a controllably positionable head and a storage medium having servo information comprising a phase pattern having a first frequency and a PES pattern having a second frequency, the second frequency being different from the first frequency.

Growing community of inventors

Sunnyvale, CA, United States of America

Huaan Zhang