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. 02, 2010
Filed:
Nov. 17, 2008
King Wai Thomas Lau, Santa Clara, CA (US);
Richard Koonwai Wong, San Jose, CA (US);
Fatih Sarigoz, Milpitas, CA (US);
Ara W. Nazarian, Tustin, CA (US);
King Wai Thomas Lau, Santa Clara, CA (US);
Richard Koonwai Wong, San Jose, CA (US);
Fatih Sarigoz, Milpitas, CA (US);
Ara W. Nazarian, Tustin, CA (US);
Broadcom Corporation, Irvine, CA (US);
Abstract
Magnetic reference patterns may be generated on a disk or other magnetic media without the need for seed wedges. This involves writing a first magnetic reference pattern to the disk with a servo writer. The disk may then be transferred to a hard disk drive. Control circuitry within the hard disk drive may recognize the first magnetic reference pattern and then position a RW head within the hard disk drive based on the first magnetic reference pattern. As the RW drive is accurately positioned based on the first magnetic reference pattern a second magnetic reference pattern may be written to the disk using the RW head. The RW head location is determined based on the velocity and phase between the read-write head and spiral sync marks contained within the first magnetic reference pattern.