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:
Feb. 10, 2015
Filed:
Dec. 18, 2013
Hitachi, Ltd., Tokyo, JP;
Akira Yamamoto, Sagamihara, JP;
Sadahiro Sugimoto, Kawasaki, JP;
Akihiko Araki, Yokohama, JP;
Masayuki Yamamoto, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage system, which has a plurality of flash packages, has a function for minimizing the imbalance of the number of deletions of each block inside the flash packageand a block-unit capacity virtualization function, and efficiently manifests lessening of the imbalance of the number of deletions and reduction in the data storage capacity for the entire storage systemby having functions for calculating the number of deletions and the data occupancy of each flash package, and for transferring data between the flash packageson the basis of the values of these number of deletions and data occupancy.