Method of starting the magnetic disk device using fluid...

Details Method of starting the magnetic disk device using fluid... Method of starting the magnetic disk device using fluid...

2007-09-07

2009-08-18

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

C360S069000

Reexamination Certificate

active

07576936

ABSTRACT:
Embodiments of the present invention provide a magnetic disk device including a spindle motor using a fluid dynamic bearing, which can send back READY within a period requested by a host system at the time of starting a magnetic disk device under low temperature and low supply voltage conditions without a particular heating approach. According to one embodiment, the magnetic disk device sets a waiting time in a period from when a spindle motor reaches a rated speed until when an HSA is loaded to a magnetic disk at the time of starting under low temperature and low supply voltage conditions within such a range that the timeout of the host does not occur, and the spindle motor itself is heated by rotation of the spindle motor in the waiting time to lower viscosity of the lubrication fluid to ensure sufficient voltage margin for an SPM driver.

REFERENCES:
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patent: 6633450 (2003-10-01), Kaneko
patent: 6735035 (2004-05-01), Smith et al.
patent: 7203021 (2007-04-01), Ryan et al.
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patent: 2001/0000982 (2001-05-01), Yamashita et al.
patent: 2003/0103289 (2003-06-01), Sakamoto
patent: 2006/0092550 (2006-05-01), Ishii et al.
patent: 2000-224891 (2000-08-01), None
patent: 2006-134377 (2006-05-01), None

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