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. 10, 1992
Filed:
Aug. 24, 1989
Donald W Janz, Oklahoma City, OK (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
Abstract
Servo disk, including three types of servo patterns distinguishable by phase, are stored in concentric tracks on a magnetic information storage disk. For phase recognition, the pattern types are arranged in triplets of sectors, each sector having a radially extending plurality of only one type of pattern with consecutive patterns in a sector being separated by three track spacings. The patterns are further arranged in radially repeating frames, each including one of each type of pattern, and the patterns are radially offset within a frame by one track spacing from one type of pattern to the next. The patterns have a radial width greater than a track spacing and, in one embodiment, are divided radially into two portions spaced apart by a distance less than one track spacing.