Seagate Technology Incorporated

Jpmorgan Chase Bank, As Collateral Agent

EngHock Lim

Myint Ngwe

WeiLoon Ng

KokHoe Chia

CheeWai Lum

QuekLeong Choo

FongKheon Chong

Jun Wang

David Loh

SanYuan Liew

BengTheam Ko

MingYou Hu

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

A method of determining run-out in a disc drive involving steps of performing a direct current erase, selecting a reference track, writing a sinusoidal signal into a first track at a first offset from the reference track, sensing a read signal along the reference track, and analyzing the read signal to extract run-out information.

Method for sensing run-out in data fields

An apparatus and associated method for detecting head collision with disc media, or other matter, during a write operation is disclosed. The method and apparatus generally monitor the resistance of an MR element on the head in order to detect a temperature increases indicative of a head collision. The resistance can be compared to a pre-selected threshold to generate an output indicative of head collision.

Write head collision detection using MR read element in disc drives

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Singapore, Singapore

EngHock Lim