DATA READING/WRITING DEVICE AND METHOD FOR READING/WRITING DATA

PROBLEM TO BE SOLVED: To provide a data reading/writing device capable of reducing the number of deletions and efficiently using an overwrite-prohibited memory by reducing a writing data amount whenever data are generated, and to provide a method for reading/writing data.SOLUTION: Whenever data are generated, a CPU 2A adds a data type to the last of the generated data in order from the head of a free space of a latest block and stores them. When there is no free space in the latest block, the CPU deletes all the data of other blocks other than the latest block, then reads the data in order from the back of the latest block, extracts data to the backmost data or data the predetermined number before the backmost data for every type on the basis of the data type added to the last of the data, and writes the extracted data in order from the top of the other blocks.