Patent ID: RE41238

Claim:
A printer having a printer main body , 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 more frequently than the memory writing unit writes information 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.