In one embodiment of an image forming apparatus according to the invention, an overwrite data determination device for determining overwrite data so that a hard disk containing information on image forming jobs is overwritten with the overwrite data. The user data includes user information in a first format. The functions also enable changes, additions, and deletions of sources and destinations of transmissions to be made without modification of a source or destination application process and without taking a source or destination application process off-line. The second stage actuator, when in the retracted position with the first stage actuator in the extended position, limits the length ol the auxiliary actuator between its connections to the strut and bogie beam, so as to assume a predetermined intermediate length in which the bogie beam is restrained to tilt about the auxiliary pivot and thereby lengthens the landing gear during take-off. Therefore, a hole-current path located under an N+ cathode area of a LIGBT structure is eliminated, thus securing sufficient latch-up current density.