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:
Sep. 19, 2000
Filed:
Oct. 20, 1998
Donald J Fasen, Boise, ID (US);
Charles E Hessing, Boise, ID (US);
Benjamin A Willcocks, Bristol, GB;
Hewlett-Packard Co., Palo Alto, CA (US);
Abstract
An adaptive media speed drive unit for use with a magnetic storage medium, the magnetic storage medium having a timing based servo pattern written thereon, the servo pattern including transitions, the drive unit including a magnetic head including a servo read element configured to read the servo pattern and produce a signal, the signal including recognizable signal events corresponding to the servo read element reading servo transitions; a servo decoder including time capture logic configured to determine the amount of time between the signal events; and a digitally controlled oscillator configured to produce a tracking clock which a write element can use to write data to the magnetic medium with a uniform spacing regardless of magnetic medium speed. A method for producing a tracking clock signal used for writing data in an equally spaced manner to a magnetic medium unit, the magnetic storage medium having a servo pattern written thereon, the servo pattern including transitions, the magnetic medium being movable relative to a magnetic head and the head including a servo read element configured to read the servo pattern and produce a signal, the signal including recognizable signal events corresponding to the servo read element reading servo transitions, the method comprising receiving the servo signal, and determining the speed of the magnetic medium, with respect to the head, by determining the amount of time between the signal events; and producing the tracking clock.