Seagate Technology Incorporated

Jun Wang

Myint Ngwe

Kah Liang Gan

Quek Leong Choo

Fong Kheon Chong

EngHock Lim

BengTheam Ko

MingYou Hu

XueYi Miao

Challa Anantha Lakshmi

Kan Liang Gan

A system and method for performing read retry operations with respect to an erroneously read data sector is disclosed. The system and method use estimates of bit error rates determined during previous attempts to read data from the sector to determine an optimal distance and direction to move a read transducer for a subsequent read retry of the erroneously data sector.

System and method for performing adaptive read retry operations in a data storage device

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

A method for optimizing the read-to-write offset of a disk drive system in respect of a track is provided. In one aspect the method includes the step of determining a first read position amongst a range of test positions offset relative to the track on the basis of read signal strength. The method further includes the steps of calculating a subrange of test positions about the first read position, selecting a second read position from the subrange on the basis of bit error rates and setting the read-to-write offset as a function of the second read position. In addition a disk drive system including means for optimally setting the read-to-write offset in respect of a track is provided.

Method and apparatus for determining read-to-write head offset of a disk drive

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Singapore, Singapore

Jun Wang