A packaging apparatus 10 including a cabinet 11 provided with a door 12 which is movable relative to an axis opening 13. The essential point of the invention is that the angle formed between the plane of a beveled surface and the plane of the adjacent lateral surface is smaller than 135 and larger than 90. The disk controller includes a redundant data generator, a difference data generator, and a redundant data generation method selector. Then the solution is introduced into the plating chamber without the occurrence of the deposition.