Western Digital Technologies, Inc.

Western Digital (fremont), Inc.

Paul Dylan Sherman

Sergey G Muchiyev

Tuyetanh Thi Dang

Trung Vinh

Rungnapa Dangrungroj

A data storage device is disclosed comprising a disk, a head for accessing the disk, and a sensor for generating an alternating sensor signal. The sensor is disconnected from an input of a sensing circuit and while the sensor is disconnected an alternating calibration signal is injected into the input of the sensing circuit, wherein the alternating calibration signal comprises a predetermined offset and amplitude. A response of the sensing circuit to the alternating calibration signal is evaluated to detect at least one of an offset and a gain of the sensing circuit.

Characterizing a sensing circuit of a data storage device

A device may be or include a cartridge configured to receive a head gimbal assembly (HGA) of a storage device and electrically connect the HGA to a HGA testing device. The cartridge may include a pre-amplifier configured to be electrically connected with corresponding electrical traces of the HGA and to the HGA testing device; a plurality of probe pins electrically connected to the pre-amplifier and configured to be electrically connected to corresponding electrical traces of the HGA; and a clamper including a dielectric layer and configured to selectively assume an open or closed configuration. In the closed configuration, the plurality of probe pins is electrically connected to corresponding ones of the plurality of electrical traces of the HGA. The clamper, in combination with at least some of the probe pins, forms an electrical filter configured to at least condition signals to and from the pre-amplifier and the HGA.

Pre-amplifier cartridge for test equipment of head gimbal assembly

An apparatus is disclosed comprising control circuitry configured to measure a rotation speed of a disk over multiple revolutions of the disk to generate a measured range of rotation speeds, select a target rotation speed from the measured range of rotation speeds, and when the rotation speed of the disk substantially matches the target rotation speed, enable writing of servo data on the disk using a head.

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San Jose, CA, United States of America

Paul Dylan Sherman