A magnetic disc memory unit is presented wherein a pair of read/write heads are on a pivot arm which is belt driven by a stepper motor. The read/write heads move in an arc, and they retract to a landing position fully off the disc when the unit is shut down. The unit incorporates several features to...http://www.google.de/patents/US4870703?utm_source=gb-gplus-sharePatent US4870703 - Magnetic disc memory unit
