NON-VOLATILE SEMICONDUCTOR STORAGE DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a card storage device with a built-in non-volatile memory for shortening the required writing time and preventing the early deterioration of rewriting durability. SOLUTION: The card storage device in which the non-volatile memory and an error correcting circuit are built, reads written data out of the non- volatile memory when there is a write error in the non-volatile memory and determines whether the error can be corrected or not by the error correcting circuit. If the error can be corrected, writing operation is completed as it is, and if it cannot be corrected by the error correcting circuit, alternate processing is done for writing the written data into another region.