Hgst Netherlands, B.v.

Western Digital Technologies, Inc.

Saurabh Deoras

Remmelt Pit

John Thomas Contreras

Samir Y Garzon

Erhard Theodor Schreck

Martin Aureliano Hassner

Satoshi Yamamoto

Sripathi Vangipuram Canchi

Sridhar Chatradhi

Craig K Yanagisawa

Kenichi Kuramoto

Natasa Letourneaut

In general, techniques are described for monitoring health of a head in a magnetic data storage drive. A health controller may be configured to receive multi-variate sensor signals indicative of a respective reference value at least one head parameter, wherein the respective reference value is based in part on at least one initial measurement of parameters of the head obtained at a first time, determine a respective predicted current value based at least in part on a respective fixed-drift model and the multi-variate sensor signals, determine a respective actual current value that is based at least in part on at least one current measurement of the head obtained at a second time later than the first time, determine a health status for the head, and store the health status in memory.

Magnetic storage system multi-sensor signal prediction health controller

A method, apparatus, and system for implementing calibration of cooling sensitivity of embedded contact sensor (ECS) using thermal fly-height control (TFC) actuations, by subtracting the linear part (TFC heat) from the total measured ECS signal, a profile is provided that is sensitive only to the clearance of the head-disk interface due to cooling effect for hard disk drives.

Implementing calibration of cooling sensitivity of embedded contact sensor (ECS) signal using thermal fly-height control (TFC) actuations

Embodiments of the present invention generally relate to a method for obtaining head/disk clearance based on ECS signal. The ECS is calibrated by applying different interface voltages to cause changes in the head/disk clearance, the ECS signal at each interface voltage is obtained, and the relationship between the change in head/disk clearance and the ECS signal is calculated. From this relationship, the head/disk clearance may be obtained based on ECS signal.

Method to convert and calibrate the embedded contact sensor signal to clearance and spacing information using interface voltage control

Approaches for a flying height control scheme in a hard-disk drive (HDD) device. The flying height control scheme utilizes an embedded contact sensor (ECS) to characterize the topography of a magnetic-recording disk at various flying heights of a head slider over a corresponding disk. A relation between a particular flying height and a corresponding ECS value which characterizes the media topography at that particular flying height is represented in disk topography data. The disk topography data is accessed and used for active flying height control for the head-disk interface in view of the current ECS value.

Media topography driven flying height modulation sensing using embedded contact sensor

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Milpitas, CA, United States of America

Saurabh Deoras