Patent ID: RE41377

Claim:
A printer, to which a cartridge is detachably attached, said cartridge keeping ink therein and having a rewritable non-volatile memory, wherein the ink kept in said cartridge is transferred to a printing medium, so as to implement printing, said printer comprising: a memory writing unit that writes plural pieces of information relating to said cartridge into said rewritable non-volatile memory of said cartridge at a preset timing and thereby at a certain frequency; a rewritable storage device incorporated in said printer main body of said printer; and an information writing unit that writes specific information into said rewritable storage device of said printer main body at a specified frequency that is higher than the certain frequency, at which the plural pieces of information relating to said cartridge are written into said non-volatile memory of said cartridge, the specific information being identical with at least part of the plural pieces of information relating to said cartridge.