Seagate Technology Incorporated

Sandeep Bhushan

Phillip Kevin McGinnis

Abhay Tejmal Kataria

Mai Ghaly

Dale Thomas Riley

Michael D Schaff

Vidur Parkash

Prasanna Manja Ramakrishna

Scott Howard Deits

Kevin David Powers

Kevin M Bailey

Vance Charles Kluver

Carl Stephen Arnold

Piengphen Swangsmutchai

Lewis Scott Kessinger Patterson

James J Martin

Deepak Prakash

Read and write transducer elements have very high reliability for most of their respective lives. Only a small percentage of transducer elements fail after a significant duration of operation in the field, but failure rate ramps up significantly with as the transducer elements age, particularly with heavy read and write use. Prior solutions to this problem involve regularly running data field integrity checks. However, the data field integrity checks are resource intensive and yield significant latency impacts. The presently disclosed technology renders data field integrity checks (that come with high latency costs) dependent upon periodic or continuous head health monitoring schemes (that come with low latency costs). The data field integrity checks are triggered by a 'poor health' signal generating from the head health monitoring schemes rather than being continuously or periodically performed with no regard to projected head health.

Head health monitor triggered data field integrity check

A method for calibrating a hard drive having a heat-assisted magnetic recording head is provided. The method includes performing, across an increasing temperature ramp, a first set of write/read operations using the head, performing, across a decreasing temperature ramp, a second set of write/read operations using the head, generating performance data associated with the head based on the first set of write/read operations and the second set of write/read operations, calculating a comparison value based on the performance data associated with the head and performance data associated with a plurality of heads, and adjusting an operating parameter value of the head based on the comparison value exceeding a threshold, the adjusted operating parameter reducing a likelihood that a laser of the head will exhibit write instability.

Identifying heat assisted recording laser stability using ramped temperature calibration

Apparatus and method for adaptively mitigating adjacent track interference (ATI) effects on a data recording medium. In some embodiments, a write count value is accumulated for a first track responsive to successive writes to a second track on the data recording medium. For each of the successive writes, the accumulated write count value for the first track is incremented by a different variable amount based on temperature. The first track is refreshed responsive to the accumulated write count reaching a selected threshold value.

Adaptive mitigation of adjacent track interference (ATI) on a recording medium

The present application discloses a transducer head comprising a read element that reads data from a storage media and an asperity sensor that detects a dimension of an asperity on a surface of the storage media using a temperature change at the asperity sensor. The asperity may be one or both of a void in the surface of the storage media and a protrusion from the surface of the storage media.

Storage media asperity detection

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Longmont, CO, United States of America

Sandeep Bhushan