Selectively stiff FDB bearing for better servo write

Details Selectively stiff FDB bearing for better servo write Selectively stiff FDB bearing for better servo write

2005-12-13

2005-12-13

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

C360S075000, C360S069000, C360S073030, C310S090000, C384S100000

Reexamination Certificate

active

06975484

ABSTRACT:
Hard disk drive track density is increased by selectively increasing the stiffness of a fluid dynamic bearing (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.

REFERENCES:
patent: 5642943 (1997-07-01), Szeremeta
patent: 5969448 (1999-10-01), Liu et al.
patent: 6400522 (2002-06-01), Milligan
patent: 6505968 (2003-01-01), Fleury et al.
patent: 6556387 (2003-04-01), Misso et al.
patent: 06-150527 (1994-05-01), None

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