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:
Nov. 20, 2001
Filed:
May. 13, 1999
Jialuo Jack Xuan, Milpitas, CA (US);
Xiaohua Shel Yang, Fremont, CA (US);
Chung-Yuang Shih, Cupertino, CA (US);
Taesun E. Kim, San Jose, CA (US);
Seagate Technology LLC, Scotts Valley, CA (US);
Abstract
A magnetic data storage medium is provided that has a substrate surface with regularly spaced, continuous ridges and grooves thereby to enhance the magnetic layer crystallization orientation. Data storage tracks extend longitudinally along the ridges, the grooves between adjacent ridges providing separation between data tracks on either side of each ridge. To form the substrate surface a focused laser beam is continuously applied to the substrate in a path of generally circumferential direction on the disk surface between inner and outer radii of a data storage zone while the substrate is rotated at a relatively constant first speed and the focused beam is moved radially at a relatively constant second speed.