Apparatus for controlling humidity in a disk drive

Details Apparatus for controlling humidity in a disk drive Apparatus for controlling humidity in a disk drive

G - Physics

11

B

309/1, 181/65, 3

G11B 33/14 (2006.01) G11B 23/50 (2006.01) G11B 25/04 (2006.01)

Patent

CA 1234625

ABSTRACT OF THE DISCLOSURE A disk drive is provided with a vent tube which is long (e.g., 20 inches) compared to its bore (e.g., 0.013 inch) to minimize diffusion of water vapor into the drive without seriously affecting pressure gradients along the length. Minimum bore diameters are given for specified lengths of vent tube. Conveniently, a desiccant is employed with a heater to absorb water vapor admitted to the drive and to expel water vapor when the drive is operated. A thermally-operated valve is also employed to expel water vapor when the drive operates. The desiccant may be employed in a chamber separated from the disk chamber, whereupon pressure valves are provided to adjust the pressures in the drive.

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