A disk drive may include a disk, a head actuated over the disk, a spindle motor comprising a plurality of windings and operable to rotate the disk and coupled to a first and a second spindle driver, the first and the second spindle driver coupled in parallel to the plurality of windings. The disk drive further includes one or more processing devices that are configured to detect a BEMF signal corresponding to a velocity and/or a position of the spindle motor, control, based on detecting the BEMF signal, commutation of the plurality of windings of the spindle motor using the first and the second spindle driver, and wherein the plurality of windings are commutated at or near the same time or in a sequential manner during one or more of a spin up and a spin down routine of the spindle motor.

A disk drive may include a disk, a head actuated over the disk, a spindle motor comprising a plurality of windings and operable to rotate the disk and coupled to a first and a second spindle driver, the first and the second spindle driver coupled in parallel to the plurality of windings. The disk drive further includes one or more processing devices that are configured to detect a BEMF signal corresponding to a velocity and/or a position of the spindle motor, control, based on detecting the BEMF signal, commutation of the plurality of windings of the spindle motor using the first and the second spindle driver, and wherein the plurality of windings are commutated at or near the same time or in a sequential manner during one or more of a spin up and a spin down routine of the spindle motor.

Embodiments generally relate to data storage in a computing system. The present technology discloses techniques that that can enable an optimized mechanism to change spinning speed of data storage disk drives. The present technology can use a service controller, e.g. a Baseboard Management Device (BMC), to communicate with a disk controller to change the spinning speed of disk drives. The present technology can improve energy efficiency by efficiently controlling the spinning speed of disk drives. It can also reduce data access latency by promptly spinning up a disk from a spun-down state.

The phase of a drive current of a motor is optimized. The phase arithmetic unit PHCAL calculates a drive voltage phase drv to converge the phase difference between the reference voltage phase bemf and the reference current phase i to zero based on a prescribed arithmetic expression. The phase correction unit PHCP determines the phase drvR after the correction by adding a correction value to the phase drv, and the magnitude of the correction value is updated by a feedback control so as to converge to a prescribed value the phase difference between the reference voltage phase bemf and the reference current phase i which are inputted. A PWM controller shifts an energization control timing synchronized with the reference voltage phase bemf based on the corrected phase drvR, and generates the PWM signal for controlling the drive voltage to a sine wave shape.

According to one embodiment, there is provided a disk device including a first connector, a second connector and a controller. The first connector is connectable to a host. The first connector includes a first pin that is electrically connectable to a light emitting device in the host. The second connector is connectable to the host. The second connector includes a second pin that is receivable with data from the host. The controller is communicable with predetermined information with the host via the first pin.