Western Digital Technologies, Inc.

Western Digital (Fremont), Inc.

Lin Mei

Lin Yang

Robert J McNab

Teik Ee Yeo

Xiaokun L Chew

William C Tipton, Ii

A disk drive is disclosed comprising a disk and a head actuated radially over the disk. The head is positioned over a first radial location, and a first data tracks per inch (TPI) is selected for data tracks recorded near the first radial location. The head is positioned over a second radial location, and a second data tracks per inch (TPI) is selected for data tracks recorded near the second radial location. The head is positioned over a third radial location, and a third data tracks per inch (TPI) is selected for data tracks recorded near the third radial location. A geometry of the head is estimated in response to TPI, TPIand TPI

Disk drive selecting TPI profile by estimating head geometry

A method of operating a disk drive including providing the disk drive. The disk drive includes a disk with data tracks and an actuator with a slider including a perpendicular magnetic write head. The write head includes leading and trailing sides defining a taper angle. The write head and the actuator define a maximum skew angle with respect to the data tracks. The maximum skew angle being greater than the taper angle. The method further includes rotating the slider during operation of the disk drive to reduce a difference between the skew and taper angles for aligning the write head with the data tracks.

Method of operating a disk drive including rotating a perpendicular write head to reduce a difference between skew and taper angles, and a disk drive

A method characterizes a generally-trapezoidally-shaped portion of a writing pole of a perpendicular magnetic write head in proximity to a magnetic medium. The method includes providing measured track width data corresponding to magnetic track widths of a plurality of tracks written by the writing pole on a rotating magnetic medium underlying the writing pole. The magnetic track widths vary as a function of skew angle of the writing pole during writing. The method further includes determining a magnetic width of the wider of a leading edge and a trailing edge of the writing pole from a first portion of the measured track width data corresponding to a first range of skew angles. The method further includes determining at least one magnetic taper angle of the writing pole from the measured track width data.

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San Jose, CA, United States of America

Lin Mei