Patent ID: 7925821
Filing Date: 2011-04-12
Classification: G06F

Abstract:
1. A nonvolatile semiconductor storage device comprising: a nonvolatile memory configured to be electrically rewritable; and a controller configured to control an access area of said nonvolatile memory on the basis of information associated with management of said nonvolatile memory, wherein said controller partitions an area of said nonvolatile memory for management and numbers management information for managing data for each area and a map of said management information in an integrated manner to write the numbered management information and map to said nonvolatile memory, thereby determining whether said management information and said map are normal on the basis of the numbering, wherein said controller, when writing said management information, attaches a number to said management information that is greater than a number of said map and, when writing said map, attaches a number that is greater than a maximum value of the number of said management information to said map, thereby determining that an area that said management information has a number lower than that of said map is the correct area of said map.