A first beam of light from a laser is split by a beam splitter into a reference beam and at least one second beam of light, the latter of which is directed from an optical head into an atmosphere. The handset receives a request to load a value onto the smart card. The functional unit may be configured to perform various peripheral device functions such as data communication functions, video functions, printing functions, mass storage functions, and human interface controller functions. The drive-force output unit is provided in the toner cartridge and is configured to output to the developing device a drive force for driving the toner-circulating member. A sensor associated with a complementary connector identifies the mode of operation associated with the interface connector. A radially inner portion of the disk is formed with an annular array of radially extending vanes adapted to move cooling air flowing in a secondary flow path from a radially-inward direction to an axial direction at a substantially center portion of said disk.