Voltage slew control of fine actuators in hard disk drive
AssigneeWestern Digital Technologies, Inc.
InventorsHideaki Ito, Gaku Ikedo, Hajime Eguchi, Ryan Mayo, Akira Yokozuka
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Abstract
A data storage device comprises a recording head, a disk, a first fine actuator group configured to position the recording head over the disk, and control circuitry. The control circuitry is configured to apply a slew control voltage waveform to the first fine actuator group to transition the first fine actuator group from an active state to an inactive state, and apply a control signal initiating at a last-applied value of the slew control voltage waveform to the first fine actuator group to transition the first fine actuator group back to the active state before completion of the slew control voltage waveform.
Claims20
A data storage device comprising:
- a recording head;
- a disk;
- a first fine actuator group configured to position the recording head over the disk;
- and
- control circuitry configured to:
- apply a slew control voltage waveform to the first fine actuator group to transition the first fine actuator group from an active state to an inactive state;
- and
- apply a control signal, initiating at a last-applied value of the slew control voltage waveform, to the first fine actuator group to transition the first fine actuator group back to the active state before completion of the slew control voltage waveform.
A method for controlling a data storage device, comprising:
- applying a slew control voltage waveform to a first fine actuator group to transition the first fine actuator group from an active state to an inactive state;
- and
- applying a control signal initiating at a last-applied value of the slew control voltage waveform to the first fine actuator group to transition the first fine actuator group back to the active state before completion of the slew control voltage waveform.
Control circuitry for controlling a data storage device, the control circuitry comprising:
- means for applying a slew control voltage waveform to a first fine actuator group to transition the first fine actuator group from an active state to an inactive state;
- and
- means for applying a control signal initiating at a last-applied value of the slew control voltage waveform to the first fine actuator group to transition the first fine actuator group back to the active state before completion of the slew control voltage waveform.
Dependencies are inferred from the claim text.