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. 16, 2012
Filed:
Aug. 21, 2009
Yoshiju Watanabe, Kanagawa, JP;
Toshio Kakihara, Kanagawa, JP;
Koichi Arai, Kanagawa, JP;
Terumi Takashi, Kanagawa, JP;
Yuzo Nakagawa, Kanagawa, JP;
Yoshiju Watanabe, Kanagawa, JP;
Toshio Kakihara, Kanagawa, JP;
Koichi Arai, Kanagawa, JP;
Terumi Takashi, Kanagawa, JP;
Yuzo Nakagawa, Kanagawa, JP;
Hitachi Global Storage Technologies, Netherlands B.V., Amsterdam, NL;
Abstract
A method for writing data to a disk drive. The method includes: receiving a write command; and, determining whether a beginning and an end of a rewrite area specified by the write command agree with boundaries of large-sized data sectors on a disk. The method also includes: reading head and tail data sectors and making a backup of the head and tail data sectors in first and second non-volatile memory areas, respectively, if the beginning of the rewrite area does not agree with the boundaries. The method includes starting a rewrite of the rewrite area after completing backups into first and second non-volatile memory areas. Moreover, the method includes: determining a state stage by using data in first, second, third and fourth non-volatile memory areas if a power shut-down occurs during execution of the write command; and, executing a recovery process in accordance with the determined state stage.