BATCH ERASABLE NON-VOLATILE MEMORY

摘要

PROBLEM TO BE SOLVED: To deal with the storage of a memory high in rewriting frequency by executing a data writing processing on a non-use area by referring to address information in the non-use area and updating address information on the non-use area when the writing request of data is received. SOLUTION: CPU 14 has an address information storage means storing address information of a non-use area in the head sector of a BGO flash memory 11 being a collective deletion-type non-volatile memory and it executes the writing processing of data in the non-use area by referring to address information of the non-use area in a cluster when the writing request of data is given. Since the writing processing is executed by referring to address information of the non-use area, data can be written without collectively deleting the cluster. When a data writing error occurs, cluster ID where the writing error occurs is changed to an invalid cluster, the new cluster is obtained and a claim processing is executed.