Patent ID: 7505698

Claim:
An image formation device that reads data from or writes data in a memory unit provided in a cartridge detachably attached to the image formation device, said image formation device comprising: a cartridge memory controller configured to control operations of reading data from the memory unit and writing data in the memory unit from a side of the image formation device; and a verification unit configured to verify reliability of the data read from the memory unit according to instructions from the cartridge memory controller; wherein whenever the cartridge reads predetermined data from the memory unit according to the instructions of the cartridge memory controller, the cartridge reads out both the predetermined data and verification data stored in the memory unit, and sends the predetermined data and verification data to the image formation device, and the verification unit compares the verification data read out according to the instructions of the cartridge memory controller to other verification data stored in a main body of the image formation device to verify reliability of the data read from the memory unit.