Seagate Technology Incorporated

SanYuan Liew

FongKheon Chong

Myint Ngwe

TeckKhoon Lim

WeiMing Yeow

QuekLeong Choo

EngHock Lim

CheeFong Oh

David Loh

Edward YinKong Hew

YoiSeng Yee

A method for monitoring a data storage medium is provided in which a virtual head fly profile is measured. In addition, a data storage device for implementing the monitoring method is provided.

Virtual head fly profile measurement

Embodiments of the present invention include a method and an apparatus for generating an optimal MRO for a zone having a plurality of tracks. A disc drive controller determines the optimum MRO of a zone of tracks by analyzing multiple tracks in the zone with the actuator arm located at a series of offsets relative to the track center. Selected tracks in the zone are written to once. Then the selected tracks in the zone are sequentially read at a first offset, and the corresponding errors recorded. This reading is repeated for each of the offsets until all offsets have been analyzed. Based on the offset, or band of offsets, with the least errors over the selected tracks, the optimum MRO can be selected for the zone. The process can be repeated for each zone and the optimum MRO values stored in an MRO table in the disc drive for use during subsequent read and write operations.

Multi-tracks MR offset tuning based on error count in certification process

A method and apparatus produce a read signal using a read head. A variable gain value is set that is used by a variable gain amplifier to amplify the read signal. The variable gain value is used to determine whether the head is functioning properly.

Transfer function for track average amplitude prediction

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Singapore, Singapore

SanYuan Liew