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:
Dec. 29, 2009
Filed:
Oct. 02, 2008
Toshitaka Matsunaga, Akishima, JP;
Hideo Sado, Ome, JP;
Seiji Mizukoshi, Hamura, JP;
Shouji Nakajima, Kodaira, JP;
Katsuki Ueda, Tachikawa, JP;
Shinichirou Kouhara, Hino, JP;
Toshitaka Matsunaga, Akishima, JP;
Hideo Sado, Ome, JP;
Seiji Mizukoshi, Hamura, JP;
Shouji Nakajima, Kodaira, JP;
Katsuki Ueda, Tachikawa, JP;
Shinichirou Kouhara, Hino, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a disk drive includes a detection signal producing module configured to produce a detection signal by reading each of the spiral servo patterns, the spiral servo patterns being read by a head while the head scans a circumferential direction region on the disk media. A position error computation module is configured to produce servo burst signals A, B, C, and D using a plurality of frames obtained by dividing the detection signal at even time intervals, at least one burst signal of the servo burst signals being produced using at least two frames in the frames, and to compute a position error of the head based on amplitude values of the produced burst signals.