Selectively stiff FDB bearing for better servo write
AssigneeSeagate Technology LLC
InventorsTroy Michael Herndon, Norbert Steven Parsoneault, Donald James MacLeod
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Abstract
Hard disk drive track density is increased by selectively increasing the stiffness of an FDB motor during servo write. Applying a load to the shaft of a fixed shaft FDB motor to close the bearing gaps increases stiffness. Alternatively, the disk drive is cooled to increase bearing fluid viscosity or the motor is operated at an increased rotational velocity.
Claims20
A method for reducing run out of an FDB motor during servo write, comprising the steps of:
- increasing the stiffness of the FDB motor's bearings during servo write;
- and
- decreasing the stiffness of the bearing after servo write.
Apparatus for increasing the stiffness of an FDB motor during servo write, comprising:
- an FDB motor bearing having a stiffness;
- and
- means for selectively increasing the stiffness of said bearing.
Apparatus for increasing the bearing stiffness of the FDB motor during servo write, comprising:
- a shaft having two ends;
- and
- a releasable clamp abutting said two ends.
Dependencies are inferred from the claim text.