Western Digital Technologies, Inc.

Tan Duy Trinh

Qing Dai

Sukumar Rajauria

Yuichi Aoki

Quang Le

Erhard Theodor Schreck

Hisashi Takano

Maki Maeda

Kosuke Nagase

Ruihua Li

Hassan Osman

A Data Storage Device (DSD) includes a disk and a slider. A change in distance between the slider and the disk is determined by applying a first voltage to the slider that increases an electrostatic force between the slider and the disk. The change in distance is approximately the same across a surface of the slider facing the disk. A first power supplied to the heating element is determined that causes thermal expansion of a portion of the slider until making disk contact without applying the first voltage. A second power supplied to the heating element is determined that causes a reduced thermal expansion of the portion until making disk contact while applying the first voltage. A first power setting is calibrated based on a correlation between the determined change in distance and a difference between the first and second powers.

Thermal fly height calibration for data storage device

A method of adjusting a humidity within an interior of an enclosure of a data storage device comprises detecting a trigger condition, and, in response to detecting the trigger condition, mixing together two or more chemicals or combinations of chemicals situated within the interior of the enclosure of the data storage device to create a water-releasing substance, and the water-releasing substance releasing water, thereby increasing the humidity within the interior of the enclosure of the data storage device. A data storage device comprises a mixing device configured to mix two or more chemicals or combinations of chemicals to provoke a chemical reaction that releases water; and a controller configured to cause the mixing device to mix the two or more chemicals or combinations of chemicals.

Active humidity control using chemical mixtures in data storage devices

The present disclosure generally relates to a magnetic recording drive comprising a write head disposed over a media. The write head comprises a main pole, a waveguide disposed adjacent to the main pole, a near field transducer (NFT) coupled between the main pole and the waveguide at a media facing surface (MFS) and a head overcoat disposed on the MFS, the head overcoat comprising SiN. The head overcoat has an extinction coefficient (k) value of about 0.0. The media comprises a media overcoat disposed adjacent to the head overcoat. The media overcoat comprises a first layer of C and a second layer of SiN disposed on the first layer. The media overcoat has a k-value of about 0.5 or greater. The head overcoat is transparent while the media overcoat is heat absorbent.

Head and media overcoats for heat assisted magnetic recording

A heat-assisted magnetic recording (HAMR) hard disk drive has a gas-bearing slider supporting a near-field transducer (NFT) and a NFT temperature sensor (NTS). An optional first IVC circuitry may provide a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a negative bias voltage to the NTS (and the connected NFT) relative to the disk to minimize the adverse effects of excessive heating on the NFT.

Heat-assisted magnetic recording device capable of providing negative electrical potential at NFT

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San Jose, CA, United States of America

Tan Duy Trinh