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. 28, 2010
Filed:
Oct. 23, 2008
Applicant:
Masashi Kisaka, Kanagawa, JP;
Inventor:
Masashi Kisaka, Kanagawa, JP;
Assignee:
Hitachi Global Storage Technologies, Netherlands, B.V., Amsterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 21/02 (2006.01); G11B 5/596 (2006.01);
U.S. Cl.
CPC ...
Abstract
Embodiments of the present invention provide a disk drive capable of appropriately measuring non-linearity in a head position control system, and a control method therefore. According to one embodiment, a magnetic disk drive inputs a reference signal Sinto a voice coil motor, inputs into the voice coil motor a control signal Sin which a harmonic component resulting from the reference signal Sis suppressed, and measures an error signal PES that may be obtained in the state where the reference signal Sand the control signal S, in which the harmonic component is suppressed, are input in the voice coil motor.