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. 28, 2008
Filed:
Mar. 05, 2004
Kenichi Nakanishi, Tokyo, JP;
Junko Sasaki, Tokyo, JP;
Nobuhiro Kaneko, Kanagawa, JP;
Osamu Nagata, Aichi, JP;
Hideaki Okubo, Saitama, JP;
Kenichi Nakanishi, Tokyo, JP;
Junko Sasaki, Tokyo, JP;
Nobuhiro Kaneko, Kanagawa, JP;
Osamu Nagata, Aichi, JP;
Hideaki Okubo, Saitama, JP;
Sony Corporation, Tokyo, JP;
Abstract
The invention provides a data storage device and a method of updating management information, capable of dealing with management information in a highly reliable manner so that information is not easily lost when an error occurs. File management information such as a FAT serving as address management information in a flash memory is stored in a management information area of the memory, a pair of blocks is assigned as blocks for use to store data of the FAT, and writing of updated FAT information is performed by alternately using the two blocks of the block pair such that previous FAT information is retained in one of the two blocks of the block pair, and updated FAT information is written in the other block of the block pair, whereby, even when an error occurs in the middle of the process of writing the updated management information, a process using the retained previous FAT information is possible.