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:
Oct. 08, 2013
Filed:
Jun. 26, 2010
Isao Yoneda, Kanagawa, JP;
Kazuhisa Shishida, Kanagawa, JP;
Chikako Sakagami, Kanagawa, JP;
Katsuhiko Ohta, Tokyo, JP;
Kenji Okada, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Kazuhisa Shishida, Kanagawa, JP;
Chikako Sakagami, Kanagawa, JP;
Katsuhiko Ohta, Tokyo, JP;
Kenji Okada, Kanagawa, JP;
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A disk drive. The disk drive includes a head, an actuator, and a controller. The head accesses a disk. The actuator is configured to support the head and to move the head by action of a voice-coil motor in a substantially radial direction of the disk. The controller is also configured to perform servo control of the actuator by using servo data read out by the head. The controller includes at least one of a plurality of notch filters having a fixed center frequency inserted in a servo-control loop. The controller is configured to increase an attenuation rate by at least one of the plurality of notch filters having the fixed center frequency at a designated frequency, when a target position of the head is at a position selected from the group consisting of a position outside of a specified region and a position within the specified region.