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:
Nov. 12, 2013
Filed:
Nov. 09, 2011
Yoshikazu Takeyama, Kanagawa, JP;
Hiroshi Sukegawa, Tokyo, JP;
Yuujiro Shimada, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A memory system includes nonvolatile memory having a plurality of memory cells of storage capacity of a specified number of bits equal to or greater than two bits, and a number-of-rewrites management table managing numbers of rewrites of the memory cells. The memory system includes a controller writing to the memory cells in a number of bits in accordance with a write request of a host, dividing the memory cells into groups in dependence on storage capacity after the numbers of rewrites of the memory cells managed by the number-of-rewrites management table exceed a specified number, and writing to the memory cells of the group corresponding to storage capacity of the number of bits in accordance with the write request of the host.