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:
Jun. 22, 2004
Filed:
Mar. 11, 2002
Applicant:
Inventor:
Nobuyuki Sakamoto, Ome, JP;
Assignee:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 ;
U.S. Cl.
CPC ...
G11B 7/00 ;
Abstract
A disk drive has an arrangement for controlling the spindle motor and driving the disk contained therein as a function of the mode of operation such as a low acoustic noise mode or a low power consumption rate mode. For normal operation of the disk drive, priority is given to the low power consumption rate mode and the spindle motor is controlled and driven by a rectangular wave drive current. On the other hand, priority is given to the low acoustic noise mode according to a command issued from the host system to the disk drive so as to control and drive the spindle motor by a trapezoidal wave drive current.