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:
May. 24, 2005
Filed:
Aug. 14, 2001
Kazuhisa Shishida, Odawara, JP;
Yosuke Seo, Sagamihara, JP;
Takahiro Inoue, Odawara, JP;
Makoto Horisaki, Odawara, JP;
Youichi Kusagaya, Mishima, JP;
Kazuhisa Shishida, Odawara, JP;
Yosuke Seo, Sagamihara, JP;
Takahiro Inoue, Odawara, JP;
Makoto Horisaki, Odawara, JP;
Youichi Kusagaya, Mishima, JP;
Hitachi Global Storage Technologies Japan, Ltd., Kanagawa-ken, JP;
Abstract
In order to achieve narrow track pitch by measuring, storing and compensating common average values for repeatable runout components between adjacent tracks in a head positioning control system for a magnetic disk drive, a compensation signal is calculated for the average value of the repeatable runout of each servo sector of at least two tracks of servo information reproduced from a magnetic disk, on the basis of an inverse function of the sensitivity characteristics of the tracking control system. The compensation signal is stored, and thereafter used for compensating the servo signal.