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:
Oct. 31, 2000
Filed:
Oct. 09, 1997
Applicant:
Inventor:
Joel R Weiss, Fremont, CA (US);
Assignee:
Akashic Memories Corporation, San Jose, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428141 ; 428336 ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 2041922 ; 360135 ;
Abstract
The invention provides discrete track magnetic recording media and methods for their fabrication. A discrete track servo pattern is imposed on an underlayer, over which a magnetic recording layer is deposited. The pattern is preferably imposed by selective laser ablation of the underlayer. Ideally the underlayer comprises sputtered carbon, which has been found to improve the signal-to-noise ratio of the subsequent magnetic layer. Optionally, a contact start/stop zone having a relatively rough surface texture is imposed, also by selective laser ablation of the underlayer.