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. 05, 2010
Filed:
Dec. 21, 2006
Minoru Tsukada, Kanagawa, JP;
Soichi Isono, Kanagawa, JP;
Tomoki Oura, Kanagawa, JP;
Yoshikatsu Fujii, Kanagawa, JP;
Koji Takahashi, Kanagawa, JP;
Minoru Tsukada, Kanagawa, JP;
Soichi Isono, Kanagawa, JP;
Tomoki Oura, Kanagawa, JP;
Yoshikatsu Fujii, Kanagawa, JP;
Koji Takahashi, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the present invention provide a magnetic disk drive capable of controlling write/read positions by a method that takes the disturbance in the circumferential direction of a magnetic disk into consideration, thereby making it possible to improve the positioning accuracy. A magnetic disk drive in accordance with an embodiment of the present invention comprises: a magnetic recording medium on which information is written to each track thereof, the recording medium having a servo signal formed in the each track at specified intervals; a magnetic head including a read head for reading a signal from the magnetic recording medium, and a write head for writing information to the magnetic recording medium. At the time of writing/reading information by the magnetic head, a servo signal is detected from among signals read out by the read head. Information about intervals of the detection is continuously acquired on the basis of the information about the servo-signal detection intervals that have been continuously acquired. The amount of rotational fluctuations of a magnetic disk is calculated; and if the amount of rotational fluctuations exceeds the predetermined allowable range, specified processing relating to at least one of writing and reading is stopped.