Western Digital Technologies, Inc.

Triet Tieu

Guoxiao Guo

Duc H Banh

Jianbin Nie

Tianyu Jiang

Various illustrative aspects are directed to a data storage device comprising one or more disks; a spindle motor for rotating the one or more disks, wherein the spindle motor comprises a plurality of magnetic pole-pairs, and wherein the spindle motor is configured to operate in a plurality of modes, including at least a first mode and a second mode; and one or more processing devices configured to select a reference point for spindle motor interrupt service routines (ISRs), determine a delay time, wherein the delay time is based at least in part on a number of magnetic pole-pairs and a mechanical revolution period of the spindle motor, start a timer at a first ISR, and when the timer is equal to the delay time, switch operation of the spindle motor from the first mode to the second mode.

Maintaining consistent location for spindle interrupts when spindle motor switches modes

Various illustrative aspects are directed to a data storage device comprising: a voice coil motor (VCM) and one or more processing devices, configured to actuate the VCM, switch on measuring a back electromotive force (BEMF) from the VCM for intervals of an initial BEMF measurement that are free of spikes in the initial BEMF measurement, and process a measured BEMF signal from the intervals of the initial BEMF measurement that are free of spikes in a change of current term of the initial BEMF measurement.

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Milipitas, CA, United States of America

Triet Tieu