An electromagnetic linear actuator for positioning a transducer over locations on a rotating magnetic recording disk comprising an actuator housing used as a stationary base for supporting various parts; a coil and cart assembly including a cart, having a rectangular cross section and tubular in construction, adapted at one end to support the transducer, and including a direct current coil with a cross section matching that of the cart mounted at the other end thereof; magnetic means affixed to the actuator housing having an air gap for receiving the coil so that the coil is immersed in a magnetic field; and support means affixed to the actuator housing engaging the surfaces of the cart and disposed about the center of gravity of a moving-mass assembly consisting of the coil and cart assembly and the transducer.