STORAGE DEVICE, METHODS FOR WRITING AND READING OUT DATA AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To extend the life of a flash memory by preventing the concentration of damages due to data erasing/writing into a specific cell. SOLUTION: A CPU determines whether read data are new or not and an inversion flag has been set up or not (steps S1, S2). When the inversion flag is not set up yet, the flag is set up (step S3) and data are written in the flash memory after inverting the data bits (steps S4, S6). When the inversion flag has been set up, the flag is reset (step S5), and then data are written in the flash memory (step S6).