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:
Jan. 13, 2009
Filed:
Oct. 29, 2007
Hideo Sado, Ome, JP;
Masahide Yatsu, Akishima, JP;
Katsuki Ueda, Ome, JP;
Toshitaka Matsunaga, Ome, JP;
Seiji Mizukoshi, Nishitama, JP;
Shouji Nakajima, Kodaira, JP;
Shinichirou Kouhara, Hin, JP;
Hideo Sado, Ome, JP;
Masahide Yatsu, Akishima, JP;
Katsuki Ueda, Ome, JP;
Toshitaka Matsunaga, Ome, JP;
Seiji Mizukoshi, Nishitama, JP;
Shouji Nakajima, Kodaira, JP;
Shinichirou Kouhara, Hin, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
According to one embodiment, a method of writing a target servo pattern constituting concentric servo tracks on a disk medium provided in a disk drive. In the method, a cumulative amplitude value of the waveform of each spiral servo pattern reproduced by the head of the disk drive is calculated, a slope of each spiral servo pattern is calculated from the cumulative amplitude value, and a pitch at which the head should be moved to write the target servo pattern is determined on the basis of the slopes of the spiral servo patterns.