Western Digital Technologies, Inc.

Jie Wan

Wei Xi

Shuyu Cao

Jern Khang Tan

Guoxiao Guo

Jie Yu

Jun Xu

Michael Troy Nicholls

Jianghong Ding

Danny J Kastler

Xiaotian Xu

Zhou Yong

A data storage device is disclosed comprising a spindle motor configured to rotate a disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. The windings of the spindle motor are commutated based on a commutation sequence while applying a periodic driving voltage to each winding. During a seek operation to seek the head a seek length, an amplitude of the periodic driving voltage is adjusted according to a driving profile corresponding to the seek length, wherein the driving profile compensates for a power disturbance during the seek operation.

Data storage device employing spindle motor driving profile during seek to improve power performance

An apparatus includes: a disk; a spindle motor configured to rotate the disk; and control circuitry with a spindle motor control loop, coupled to the spindle motor, the control circuitry configured to: inject a bandwidth test frequency into the spindle motor control loop, measure an open loop gain of the spindle motor control loop, calculate, using coordinate transformations, an estimated loop bandwidth of the spindle motor control loop based at least on one iteration of the bandwidth test frequency injection and the open loop gain measurement, and generate optimum loop parameters of the spindle motor control loop.

Electronic system with a method of motor spindle bandwidth estimation and calibration thereof

A disk drive is disclosed comprising a head and a disk comprising a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors. The disk drive further comprises control circuitry comprising a servo control system operable to actuate the head over the disk in response to the servo sectors. The disk is rotated at a first speed and the servo sectors are read at a first servo sample frequency to generate first servo samples. The disk is rotated at a second speed different from the first speed and the servo sectors are read at a second servo sample frequency to generate second servo samples. The second servo samples are processed to measure a frequency response of the servo control system proximate the first servo sample frequency.

Disk drive adjusting rotation speed of disk to compensate for blind area when measuring frequency response of servo control system

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Singapore, Singapore

Jie Wan