Abstract: Cartridge positioning apparatus for loading and unloading the disk cartridge of an information storage disk drive system employs a dual function, motor-actuated, laterally moving linear drive mechanism to drive a plurality of drive plates located in an interstitial space between a cartridge receiving guide means and a central mount plate by means of a drive tab extending up through the mount plate. The tab engages a camming plate which operates against the central portion of a pivoted sector gear to convert the lateral tab drive motion into amplified longitudinal motion parallel with the direction that the disk cartridge is inserted and removed. The camming plate includes an idling provision to hold the sector gear stationary while the motor-performs other load functions. The sector gear drives a longitudinal drive mechanism which carries one or more members adapted to contact the disk cartridge for loading or unloading the cartridge depending on the direction of movement of the motor-actuated drive tab.