The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 01, 1994
Filed:
Mar. 10, 1992
Michael R Hatch, Palo Alto, CA (US);
Ronald R Moon, Los Gatos, CA (US);
Klaus-Peter Deyring, Scotts Valley, CA (US);
James A McDonald, III, Scotts Valley, CA (US);
Thomas J Huber, San Jose, CA (US);
Gregg J Uhlendorf, Morgan Hill, CA (US);
Daniel E Barnard, San Jose, CA (US);
Bryan T Silbermann, Los Gatos, CA (US);
Philip L Steiner, San Jose, CA (US);
Robert P Cloutier, Campbell, CA (US);
Robert J Kobliska, San Jose, CA (US);
NEC Corporation, Tokyo, JP;
Abstract
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.