An event that indicates unexpected shutdown of a hard disk drive is determined. The hard disk includes first and second controllers that control respective first and second independently-operable actuators. Each of the actuators has one or more heads that access one or more spinning disks of the hard disk drive. While receiving power for the hard disk drive via back-electromotive force of a motor driven by the one or more spinning disks in response to the event, the first and second controllers independently move the respective first and second actuators to safe positions. In response to determining the first and second actuators are in safe positions, write cache data associated with the first and second controllers is written to a non-volatile memory.

A data storage device can consist of a data storage medium that has a recording surface accessed by a first transducing head suspended by a first actuator and a second transducing head suspended by a second actuator. The first actuator may be configured to access a first region of the recording surface while the second actuator is configured to access a second region of the recording surface. The first and second regions can be separate and non-overlapping.

In a multi-actuator drive, the effect of moving a first actuator (the so-called “aggressor actuator”) in on a second actuator (the so-called “victim actuator”) is reduced or compensated for. A victim feedforward signal is added to a microactuator control signal of the victim actuator in response to a voice-coil motor (VCM) control signal that is applied to the aggressor actuator. The feedforward signal is configured to compensate for disturbances to the victim microactuator caused by VCM commands provided to the aggressor actuator. The feedforward signal is based on a transfer function that models commands added to the victim microactuator, which is coupled to the head of the victim actuator, as a function of the aggressor VCM control signal applied to the aggressor actuator.

A data storage device includes a stack of a plurality of disks, first and second arms, first and second heads, first and second linear drivers and an elevator. Each of the plurality of disks includes a read/write surface. The first arm has a first head end that is movable relative to the stack. The first head is configured to interact with a selected one of the read/write surfaces. The first linear driver is configured to move the first arm along a first straight line in a x-y plane defined by the one of the read/write surfaces. The elevator is configured to move the first arm in a z direction. The second arm has a second head end that is movable relative to the stack and supports the second head. The second linear driver is configured to move the second arm along a second straight line in the x-y plane.

Examples of a suspension are provided. The suspension includes a mount plate attached to a load beam at a suspension assembly attachment point. The suspension may include a first actuator and a second actuator located at the mount plate. The first actuator is shaped as a non-right angle parallelogram spanning across a first opening in the mount plate. The second actuator is shaped as a non-right angle parallelogram spanning across a second opening in the mount plate. The first and second actuators are configured to deflect the distal end of the mount plate, which causes the load beam to rotate with a rotation center located along the load beam.

A disk device includes one or more disks, a base shaft, a bearing shaft, first and second bearing units, first and second actuator assemblies, and a damping member. The bearing shaft has a tubular portion fixed around the base shaft. The first and second bearing units are attached around the bearing shaft and aligned in an axial direction of the bearing shaft. The first and second actuator assemblies are coupled to the first and second bearing units, respectively. The damping member is provided between an outer circumferential surface of the base shaft and an inner circumferential surface of the tubular portion of the bearing shaft.

In a multi-actuator drive, the effect of moving a first actuator (the so-called “aggressor actuator”) in on a second actuator (the so-called “victim actuator”) is reduced or compensated for. A victim feedforward signal is added to a microactuator control signal of the victim actuator in response to a voice-coil motor (VCM) control signal that is applied to the aggressor actuator. The feedforward signal is configured to compensate for disturbances to the victim microactuator caused by VCM commands provided to the aggressor actuator. The feedforward signal is based on a transfer function that models commands added to the victim microactuator, which is coupled to the head of the victim actuator, as a function of the aggressor VCM control signal applied to the aggressor actuator.

A data storage device includes at least one data storage medium having a plurality of tracks. The data storage device also includes at least one actuator that supports at least one head that is configured to interact with different tracks of the plurality of tracks on the at least one data storage medium to service commands from a host. The data storage device further includes a seek control circuit communicatively coupled to the at least one actuator. The seek control circuit is configured to store the commands from the host in at least one queue for execution by the at least one actuator. The seek control module is also configured to adjust power provided to the at least one actuator for seek operations to the different tracks of the plurality of tracks based on command age-related measurements of the commands from the host.

A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.

A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.