Disk drive having reduced variation of disk surface...

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

Reexamination Certificate

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C360S097010, C360S073030

Reexamination Certificate

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07002768

ABSTRACT:
A disk drive having a layer of lubricant on a disk surface, where an undesirable lubricant layer thickness modulation is reduced by varying ω/f during operation of the disk drive. Here ω is the angular velocity of the disk and f is a resonant frequency of a head assembly containing the head. In this manner, the amplitude of the lubricant thickness modulation is decreased, improving disk drive performance. The ratio ω/f is preferably varied by varying the disk angular velocity ω.

REFERENCES:
patent: 5202803 (1993-04-01), Albrecht et al.
patent: 5793553 (1998-08-01), Smith
patent: 5850321 (1998-12-01), McNeil et al.
patent: 6252737 (2001-06-01), Yanagisawa
patent: 6262545 (2001-07-01), Yamamoto
patent: 2003/0086200 (2003-05-01), Tokizono et al.
Ma, et al., “Lubricant Thickness Modulation Induced by Head-Disk Dynamic Interactions,” IEEE Transactions on Magnetics, vol. 38, No. 1, Jan. 2002, pp. 112-117.
Gurumurthi, et al., “DRPM: Dynamic Speed Control for Power Management in Server Class Disks,” Dept. of Computer Science and Engineering, The Pennsylvania State University, University Park, PA 16802.

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