Buffer memory with two storage areas, cartridge and image forming apparatus using the same; memory control method for double-checking an update, program and computer-readable recording medium therefor

摘要

An image forming apparatus in which a non-volatile memory has a first storage area for storing information data of predetermined unit size and a second storage area for storing status information related to the image formation as bit-unit data. A printer control unit, which controls writing/reading of the information related to image formation to/from the memory, stores the information related to image formation, stored in the first storage area as the predetermined unit data, as compressed bit-unit status data into said second storage area.