| 摘要 |
PROBLEM TO BE SOLVED: To provide a memory system suppressing read disturbance while reducing a use area. SOLUTION: The memory system includes: a memory 6 including strings each connected with memory cells in series, writing/reading data by the page PG that is a set of the memory cells belonging to the different strings, and erasing the data by the block BLK that is a set of the strings; and a controller 7 controlling the memory 6. The controller 7 includes: a holding part 14 holding a table 25 related to an inspection target page PG in each zone Zone that is a set of the blocks; and a control part 12 calculating an occurrence rate of erroneous reading to the inspection target page about the zone including a reading target page, and directing the memory 6 to write the data of the inspection target page into another block when the occurrence rate exceeds a predetermined threshold. COPYRIGHT: (C)2011,JPO&INPIT
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