Western Digital Technologies, Inc.

Zhou Yong

Jianghong Ding

Shuyu Cao

Jie Wan

Jern Khang Tan

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.

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Ningbo, China

Zhou Yong