MEMORY SYSTEM, STORAGE DEVICE, AND MEMORY SYSTEM CONTROL METHOD

摘要

The present invention suppresses memory cell degradation in nonvolatile memory. A read processing unit carries out read processing in which reading data is read from a plurality of memory cells on the basis of a first threshold. An error detection unit detects the presence of errors in the reading data and specifies memory cells having errors from among the plurality of memory cells. A rereading processing unit carries out rereading processing in which data from the specified memory cells is read as rereading data on the basis of a second threshold different from the first threshold. A refresh processing unit carries out refresh processing in which rereading data for memory cells from among the specified memory cells for which a rereading data value is different from the reading data is rewritten.