Apparatus for detecting and recovering from data destruction caused in an unaccessed memory cell by read, and method therefor

TLDR: In this paper, the memory controller is configured to count how many times data read processing has been executed in memory cells within the management area; read, when the data read-processing count that is counted for a first management area exceeds a first threshold, data and an error correction code that are stored in the memory cells contained within the first management areas; decode the read error correction codes; and write the data corrected by decoding the erasure code in other management areas than the first manager area.

Abstract: Read error in a flash memory destroys data that is not requested to be read, and an efficient read disturb check method is therefore needed. In addition, data may be destroyed beyond repair by error correction before a read error check is run. A non-volatile data storage apparatus including a plurality of memory cells and a memory controller, in which the memory controller is configured to: count how many times data read processing has been executed in memory cells within the management area; read, when the data read processing count that is counted for a first management area exceeds a first threshold, data and an error correction code that are stored in the memory cells within the first management area; decode the read error correction code; and write the data corrected by decoding the error correction code in other management areas than the first management area.