In a magazine, when a lid is opened for loading a recording material, a discrimination pin is unlocked and shifted from a first position to a second position. When a magazine is set to a printer processor, a positioning pin presses the discrimination pin to shift to the first position, at which the discrimination pin is locked. After removal of the magazine from the printer processor, the discrimination pin is in the first position. When the lid is opened to load fresh recording material in the magazine, the discrimination pin is in the second position. It is discriminated by detecting the position of the discrimination pin whether the magazine is a partially used one. When the partially used magazine is set to the printer processor, a forward edge of the recording material is not cut.