Miniscribe Corporation

Roy A Applequist

Richard M Altobellis

Robert F Hoppe

Terry G Johnson

Glade N Bagnell

James O Jacques

In a device for retrieving and recording (read/write) information on at least one rigid disk, a stepping motor servo system operated in an open-loop manner is provided to rapidly and accurately position read/write heads relative to the disk. A fixed guide shaft adjacent to and transverse to the motor shaft carries a carriage slidably thereon, preferably on oil impregnated bearings, the carriage member including a gear rack and the stepping motor having a pinion gear thereon interfacing with the gear rack. A preload bearing is urged against the carriage at a position between the guide shaft and the pinion gear such that the carriage is rotated around the guide shaft into engagement with the pinion gear at the rack portion thereof. The stepping motor is preferably fixed to the device chassis at a position and location spaced from the pinion gear a distance corresponding to the distance of a preferred spring steel head support arm utilized to carry the read/write head, to compensate for thermal expansion differences between the chassis material, and the spring steel head support arm.

Method and apparatus for storing and retrieving information

A ventilation and filtration system and method for an enclosure isolating a memory device spinning disk mechanism from airborne contaminants in which a vent through a remote filter from the ambient atmosphere is positioned with one opening adjacent the center portion of the spinning disk whereby the enclosure is vented through the filter to the ambient pressure at a location at substantially the lowest pressure within the enclosure as a result of the air pumping action of the spinning disk to thereby over pressurize the remainder of the enclosure and minimize unfiltered leaks of outside air into the enclosure.

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Windsor, CA, United States of America

Roy A Applequist