Seagate Technology Incorporated

Shawn Stephen Silewski

Huazhou Lou

Dongming Liu

Tim Rausch

Alfredo Sam Chu

Jason Wayne Riddering

Lin Zhou

Franklin P Martens

Sham Sunder Nayar

Michael A Cordle

John George Gerogeorge

Ronald Jacob Smith

Eric John McCalla

Mark Curtis Fahrendorff

James Robert Oscarson

An apparatus comprises a slider configured for writing data to and reading data from a magnetic recording medium and for heat-assisted magnetic recording. The slider comprises a heater configured to receive an AC signal and to cause oscillation in a spacing between the slider and the medium, and a contact sensor situated on the slider and configured to produce a DC response signal. A detector is coupled to the slider and configured to measure an amplitude of a spike in the DC response signal, calculate a ratio between the spike amplitude and an amplitude of the DC response signal, and detect contact between the slider and the medium in response to the ratio exceeding a predetermined threshold.

Head-disk contact detection using a thermal sensor for modulation air bearings

An apparatus comprises a heat-assisted magnetic recording (HAMR) head, a sensor, and a controller. The HAMR head is configured to interact with a magnetic storage medium. The sensor is configured to produce a signal indicating the occurrence of head-medium contact. The controller is configured to receive the signal and concurrently determine from the signal if the occurrence of head-medium contact is caused by a first contact detection parameter, a second contact detection parameter, or both the first and second contact detection parameters.

Concurrent modulation and frictional heating head disk contact detection

A data storage device and associated methods may provide at least a data storage medium that is separated from a heat assisted magnetic recording data writer and is connected to a controller. The controller can be configured to change a laser power of the heat assisted magnetic recording data writer in response to a tested bit error rate of a median data track of a plurality of adjacent data tracks reaching an identified threshold.

Adaptive HAMR laser power data storage device

An apparatus and associated method for measuring spatial characteristics of a test object with stacked features. First and second measurement assemblies for measuring opposing first and second planar features, respectively, of a test object, by directing light beams into a gap between the features to measure a position and a static attitude of each feature.

Measurement of test object with stacked features

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Eden Prairie, MN, United States of America

Shawn Stephen Silewski