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:
Sep. 16, 2008
Filed:
Aug. 23, 2006
Atsushi Tobari, Kanagawa, JP;
Masahide Yamasaki, Kanagawa, JP;
Masaomi Ikeda, Kanagawa, JP;
Junzou Noda, Kanagawa, JP;
Atsushi Tobari, Kanagawa, JP;
Masahide Yamasaki, Kanagawa, JP;
Masaomi Ikeda, Kanagawa, JP;
Junzou Noda, Kanagawa, JP;
Hitachi Global Storage Technologies, Amsterdam, NL;
Abstract
Embodiments of the invention prevent offtrack write that will be caused due to a head vibration in a storage device. In one embodiment, a hard disk drive (HDD) judges approval/disapproval of write of user data to a magnetic disk by using a read signal for user data in addition to servo data in write processing. Thus, a head vibration which cannot be precisely detected based on servo data is detected to prevent off-track write. More specifically, the HDD acquires a read back signal amplitude of a read element with respect to a user data sector within adjacent servo data during a write access phase, and detects a vibration from a maximum value MAX and a minimum value MIN of the read back signal amplitude to judge data write approval/disapproval.