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:
May. 05, 2015
Filed:
Apr. 09, 2013
Hitachi, Ltd., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage device includes a nonvolatile memory, a volatile memory, and a memory controller. The volatile memory includes a free block management table, and a worn block management table. If the number of free blocks is equal to or larger than a threshold value 1, and errors of the number of equal to or larger than a threshold value 2 but smaller than a threshold value 3 are included in the data read from the nonvolatile memory, the memory controller registers the block in the worn block management table as a worn block. If the number of free blocks becomes smaller than the threshold value 1, the memory controller registers the worn block registered in the worn block management table in the free block management table as the free block.