Abstract: A data storage device is disclosed comprising a disk comprising timing data, a spindle motor configured to rotate the disk, wherein the spindle motor comprises a plurality of windings, and a head actuated over the disk. A phase of a commutation controller is initialized based on the timing data on the disk, and a commutation sequence of the commutation controller is driven based on the timing data on the disk, wherein the commutation controller is configured to commutate the windings based on the commutation sequence. The phase of the commutation controller is re-initialized based on the timing data on the disk, thereby compensating for a cumulative phase error when driving the commutation sequence based on the timing data on the disk.

Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. During a spin-up operation a sinusoidal driving voltage is applied to each winding of the spindle motor. A back electromotive force (BEMF) voltage generated by at least one of the windings is measured, and a rotation speed of the spindle motor is measured. The sinusoidal driving voltage is adjusted in order to optimize a lead angle relative to the rotation speed, wherein the lead angle represents a degree the sinusoidal driving voltage leads the BEMF voltage.