Nec Corporation

James A McDonald, Iii

Michael R Hatch

Ronald R Moon

Daniel E Barnard

Gregg J Uhlendorf

Robert P Cloutier

Klaus-Peter Deyring

Robert J Kobliska

Bryan T Silbermann

Philip L Steiner

Thomas J Huber

A hard disk drive for a computer system including a head disk assembly with a disk platter of approximately one-and-eight-tenths-inch in diameter capable of storing more than forty megabytes. In an embodiment, data tracks on each data surface of the platter are spaced at approximately 2,558 tracks per inch and each data track has approximately 36,000 flux changes per inch. An actuator positions a pair of read/write heads on each platter surface using a voice coil motor to position the heads over a cylinder. A magnetic actuator latch attaches to another magnet on the actuator and locks the heads in a parked position at the innermost diameter of the platter. A spindle motor rotates the platter at approximately 5,400 revolutions per minute. A base plate, with a gasketed surface and a raised lip, hermetically seals with a cover to the base plate such that the platter, the actuator, the actuator latch, and the spindle motor are all contained within. The cover carries a breather filter and recirculating air filter. The raised lip on the base plate prevents direct electrical interference from passing between the base plate and the cover.

Micro miniature hard disk drive

Growing community of inventors

Scotts Valley, CA, United States of America

James A McDonald, Iii