Importance

Loading Importance Indicators...

Abstract

According to one embodiment, a memory system includes nonvolatile memory, and a memory controller. The nonvolatile memory includes a plurality of blocks, each including a plurality of pages. The memory controller controls the nonvolatile memory. Here, the memory controller detects a first page of which a required minimum shift amount of a read voltage is largest for each block by reading data stored respectively in the plurality of pages while performing error detection. Further, the memory controller detects a second page of which the required minimum shift amount of a read voltage is larger than a predetermined first threshold by reading data stored in the first page of each of the blocks while shifting the read voltage in a first range, and performing error detection. Further, the memory controller refreshes data stored in the block having the second page.

Loading the Abstract Image...

First Claim