Western Digital Technologies, Inc.

Zhenyu Zhang

Duc T Phan

Chuanwen Ji

Donald Joseph Brunnett

Yanan Huang

Alexander Babinski

Shan Tang

Eugene Chun-Tsing Wu

Alan M Fossen

A data storage device is disclosed comprising a plurality of disk surfaces including a first disk surface and a second disk surface. A first head is actuated over the first disk surface, and a second head is actuated over the second disk surface. A ramp is located proximate an outer diameter of the disk surfaces. A stroke difference between the first and second heads is measured by moving the first and second heads toward the ramp and detecting when the heads contact the ramp.

Disk drive measuring stroke difference between heads by detecting a difference between ramp contact

An apparatus includes: a media; a head over the media; a read channel, coupled to the head, configured to extract data from the media; control circuitry, coupled to the read channel, configured to execute a read command; and wherein the read channel is further configured to: generate, based on extracting the data from the media, a data condition indicator, and provide, for use by the control circuitry, the data and the data condition indicator.

Electronic system with media scan mechanism and method of operation thereof

A data storage device is disclosed comprising a head actuated over a disk surface comprising tracks defined by servo sectors, wherein each servo sector comprises at least one servo burst comprising a periodic pattern. The servo burst of one of the servo sectors is read to generate a read signal, and M intermediate integration points yare computed according to: where r(kT) represents a sample point of the read signal, Trepresents a sample interval between the sample points, and &#x3c9; represents a frequency of the periodic pattern in the servo burst.

Data storage device demodulating servo burst by computing slope of intermediate integration points

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Irvine, CA, United States of America

Zhenyu Zhang