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:
Dec. 29, 2009
Filed:
Oct. 08, 2004
Katsuya Nakashima, Nagasaki, JP;
Hideki Hara, Kanagawa, JP;
Takashi Akai, Tokyo, JP;
Toshifumi Nomura, Kanagawa, JP;
Kazumi Sato, Kanagawa, JP;
Yukihisa Tsuneda, Kanagawa, JP;
Toshiyuki Nishihara, Kanagawa, JP;
Katsuya Nakashima, Nagasaki, JP;
Hideki Hara, Kanagawa, JP;
Takashi Akai, Tokyo, JP;
Toshifumi Nomura, Kanagawa, JP;
Kazumi Sato, Kanagawa, JP;
Yukihisa Tsuneda, Kanagawa, JP;
Toshiyuki Nishihara, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A file storage apparatus capable of restoring integrity of file management information even when a power supply abnormality occurs without lowering the write speed. When updating meta data stored in an HDD, log data for reconstructing the meta data after update from the meta data before update is written into a non-volatile RAM (NVRAM), then, after this writing is completed, the update is executed. Accordingly, even when the update use meta data temporarily stored in a cache memory is partially lost due to trouble such as a power supply abnormality and when update of the meta data of a hard disk is incomplete, the log data corresponding to the meta data for the update is held in the NVRAM, so it becomes possible to restore the integrity of the meta data on the hard disk by using this log data.