Seagate Technology Incorporated

KokSeng Lim

KokHoe Chia

CheeWai Lum

TeckKhoon Lim

KokChoon See

LianYong Tan

SoonWah Leow

TienHiong Lee

A method of performing a retry procedure may begin with detecting an error in a first zone of a data storage medium. Upon detecting the error, it is determined whether any retry procedure of a sequence of retry procedures has been performed upon detecting a previous error in the first zone. If a first retry procedure of the sequence was unsuccessfully performed upon detecting the previous error, there is performed a second retry procedure that follows next after the first retry procedure in the sequence.

Performing retry operations

A recording surface is segmented into a plurality of radial zones each containing a plurality of concentric tracks on which data may be recorded. The recording surface is initially formatted with a data frequency for each zone such that all of the zones have substantially the same data density. The data frequency is reduced for a first zone whose error rate is initially less than the predetermined error rate so that the first zone exhibits an error rate meeting the predetermined error rate. The data frequency for a second zone whose data transfer error factor initially exceeds the predetermined error rate is increased to restore any loss of storage capacity of the recording surface due to the reduced data frequency in the first zone. As a result, the data density in the first zone is substantially less than a nominal data density and the data density in a second zone is substantially greater than the nominal data density. The data storage capacity of the recording surface is at least as great as a minimum data storage capacity.

Adaptive zone frequency compensation for disc drives

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Singapore, Singapore

KokSeng Lim