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:
Jan. 14, 2003
Filed:
Jun. 11, 1999
Timothy J. Elliott, Fountain Valley, CA (US);
Western Digital Technologies, Inc., Lake Forest, CA (US);
Abstract
An efficient, time saving, cost-effective method of using a servo track writer (STW) for continuously recording servo information along one, continuous, single helix spiral path on the surface of a magnetic disk in a disk drive. The write transducer is guided along the single-helix spiral path by moving the write transducer at a constant radial velocity while the disk is rotating. The STW moves the write transducer less than a head's width per revolution such that the strokes of each spiral revolution overlaps the stroke of a prior spiral revolution. The resulting servo track centerlines are formed as spiral servo segments that are written quickly and relatively smoothly, but are separate or disjointed from one another. A disk drive incorporating such uniquely written servo information uses suitable offset information as a function of servo wedge number so that the drive may track follow any one of a plurality of circular data tracks or one long spiral data track.