System and method for calibrating and controlling the internal pressure of a hard disk drive
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United States of America Patent
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-
Jul 1, 2003
Grant Date -
N/A
app pub date -
Jan 19, 2000
filing date -
Jan 19, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A sealed hard disk drive contains a vacuum pump for decreasing the internal pressure inside the drive. The lower internal operating pressure decreases aerodynamic drag between the actuator arm assemblies and the rotating disks. In addition, the power consumed by the drive is reduced and the its operating temperature is lowered. The fly height of the heads relative to the disks or the head-disk interface condition is also monitored. The pump is selectively actuated in response to the measured change in flying height of the heads from their original manufactured settings. In one version, the drive is also equipped with a pressure transducer for monitoring the drives internal pressure.
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