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. 20, 2009
Filed:
Dec. 12, 2006
Tomohisa Okada, Kanagawa, JP;
Tomohisa Okada, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments in accordance with the present invention provide a disk drive and a control method in the disk drive which can obtain good recording performance by amplifying the write current according to the recording method and the recording frequency. A HDD in accordance with an embodiment of the present invention comprises a write current supply section and a write head. The write current supply section generates a write signal for recording to a disk and, based on the write current, generates a write current I. The write head records data to the disk by the write current I. The write current supply section comprises a write channel to generate a write signal, a write driver to generate a write current from the write signal, a high frequency pattern extracting circuit to extract high frequency pattern parts from the write signal, and a write driver to generate a write current Ifrom the extracted high frequency pattern parts. The write currents and are added up and supplied to the write head as the write current whose magnitude is amplified only when the frequency is high.