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:
Apr. 10, 2012
Filed:
Sep. 02, 2008
Dieter Klaus Weller, San Jose, CA (US);
Hans Jurgen Richter, Palo Alto, CA (US);
David S. Kuo, Palo Alto, CA (US);
Kim Yang Lee, Fremont, CA (US);
Dieter Klaus Weller, San Jose, CA (US);
Hans Jurgen Richter, Palo Alto, CA (US);
David S. Kuo, Palo Alto, CA (US);
Kim Yang Lee, Fremont, CA (US);
Seagate Technology, LLC, Cupertino, CA (US);
Abstract
A method of making a disc for a computer disc drive and a disc made in accordance with the same. The disc includes a deposited magnetic layer of a thin film medium over a disc-shaped substrate. A master pattern having a plurality of tracks is recorded on the disc. Each track on the disc includes a plurality of magnetic islands, each having a size and magnetic properties. The size and/or magnetic properties of one or more of the magnetic islands of each track are modulated such that each track has a modulation frequency, so as to imprint a magnetic topology on the disc. The modulation frequency of each track is either a fundamental frequency or an overtone of the fundamental frequency.