A control device is provided which can perform a retraction operation of a head included in a disk storage device with lower power consumption. The control device of the disk storage device includes a control unit that controls a motor and retracts the head from over a disk to a ramp mechanism when power supply is shut down, an acquisition unit that acquires information related to a moving distance of the head that retracts to the ramp mechanism, and a calculation unit that calculates the moving distance of the head based on the information acquired by the acquisition unit. The control unit switches an operation of the motor from a first retract operation to a second retract operation when determining that the head reaches a first position after passing through an inclined surface of the ramp mechanism based on the moving distance calculated by the calculation unit.

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 control device is provided which can perform a retraction operation of a head included in a disk storage device with lower power consumption.

The control device of the disk storage device includes a control unit that controls a motor and retracts the head from over a disk to a ramp mechanism when power supply is shut down, an acquisition unit that acquires information related to a moving distance of the head that retracts to the ramp mechanism, and a calculation unit that calculates the moving distance of the head based on the information acquired by the acquisition unit. The control unit switches an operation of the motor from a first retract operation to a second retract operation when determining that the head reaches a first position after passing through an inclined surface of the ramp mechanism based on the moving distance calculated by the calculation unit.

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.

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.

A data storage device comprises a disk; a spindle on which the disk is mounted; a spindle motor that rotates the spindle; an actuator arm configured with a recording head; and an actuator that rotates the actuator arm about a pivot to move the actuator arm radially across a disk surface. Control circuitry controls the actuator to move the actuator arm across the disk surface while simultaneously applying an active brake to decelerate the spindle by controlling a driver voltage to be out of phase with a back electromotive force (BEMF) voltage of the spindle motor.

A data storage device comprises a disk; a spindle on which the disk is mounted; a spindle motor that rotates the spindle; an actuator arm configured with a recording head; and an actuator that rotates the actuator arm about a pivot to move the actuator arm radially across a disk surface. Control circuitry controls the actuator to move the actuator arm across the disk surface while simultaneously applying an active brake to decelerate the spindle by controlling a driver voltage to be out of phase with a back electromotive force (BEMF) voltage of the spindle motor.