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. 29, 2009
Filed:
Feb. 07, 2008
Mirei Hosono, Kanagawa, JP;
Kazunari Tsuchimoto, Kanagawa, JP;
Hideki Ohzeki, Kanagawa, JP;
Tetsuo Ueda, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Kazuyuki Ishibashi, Kanagawa, JP;
Hiroshi Uchida, Kanagawa, JP;
Mirei Hosono, Kanagawa, JP;
Kazunari Tsuchimoto, Kanagawa, JP;
Hideki Ohzeki, Kanagawa, JP;
Tetsuo Ueda, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Kazuyuki Ishibashi, Kanagawa, JP;
Hiroshi Uchida, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., Amsterdam, NL;
Abstract
Embodiments of the present invention help to achieve a read error recovery, and suppress decreases in the capacity of the disk drive device and degradation in performance. In one embodiment, a hard disk drive (HDD) performs following control without use of repeatable run-out (RRO) compensation information on a magnetic disk in a normal reading process. When an error occurs in a normal reading process, the HDD moves a read element to a position different from a target position of the normal reading process. At the position where the read element has been moved, the read element reads out the RRO compensation information. In a recovery procedure for the reading process where the error has occurred, the HDD performs following control with compensation by the servo compensation information read out by the read element.