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:
Feb. 01, 1983
Filed:
Aug. 22, 1980
Raymond Brooke, Woodland Hills, CA (US);
Pertec Computer Corporation, Los Angeles, CA (US);
Abstract
A simple flexible magnetic disk memory system is provided which enables precise positioning of a read/write head to follow a data track, despite non-uniform expansion or contraction of the disk. Several positioning sectors of the disk are formed which have positioning tracks recorded thereon, and several corresponding holes are punched in the disk to enable an optical sensor to determine the sector locations. Although a step motor positions a head at the approximate middle of a selected data track, an analog circuit repeatedly adjusts the head location as each positioning sector passes the head. Four positioning sectors can be used which are each aligned with or angled by 90.degree. from the direction of machining of the sheet material of which the disk was made, to minimize track run-out in each data region that lies between positioning sectors.