Error correction device, error correction method, and semiconductor memory system

A semiconductor memory system, comprising:

• a nonvolatile memory;
• and
• a controller configured to:
• read out user data encoded with an error correction code from the nonvolatile memory;
• perform error correction decoding based on the error correction code on read data of a size;
• and
• rewrite one or more bits in the read data of the size;
• wherein the one or more bits comprise M consecutive bits or a plurality of bits at N-bit intervals, and wherein M is a natural number equal to or greater than 1, and wherein N is a natural number equal to or greater than 1.

An error correction method, comprising:

• reading user data encoded with an error correction code from a nonvolatile memory;
• performing error correction decoding based on the error correction code on read data of a size;
• and
• rewriting one or more bits of the read data of a size;
• wherein the one or more bits comprise M consecutive bits or a plurality of bits at N-bit intervals, M is a natural number equal to or greater than 1, and N is a natural number equal to or greater than 1.