Transducer positioning mechanism in a random access memory system

Claim 1

A CONTROL SYSTEM FOR POSITIONING TRANSDUCERS AT SELECTED ADDRESSES IN A RECORDING SURFACE FORM OF MEMORY, SAID SYSTEM COMPRISING A PLURALITY OF TRANSDUCERS, A PLURALITY OF RECORDING SURFACES, ONE RECORDING SURFACE HAVING A REFERENCE PORTION, A REFERENCE RECORDING SURFACE DISPOSED ACROSS SUBSTANTIALLY ALL SAID REFERENCE PORTION OF SAID ONE RECORDING SURFACE, AN ERASABLE REFERENCE TRACK, MEANS COUPLED TO SAID RECORDER DEVICE FOR OPERATING THE SAME TO PROVIDE SAID ERASABLE REFERENCE TRACK; SAID TRACK BEING DIFFERENTLY POSITIONED FOR EACH DESIRED ADDRESS, AND SAID REFERENCE TRACK DIVIDING SAID REFERENCE PORTION INTO TWO OPPOSITELY RECORDED AREAS, AND A SERVO SYSTEM INCLUDING ONE OF SAID TRANSDUCERS RESPONSIVE TO EITHER OF THE OPPOSITELY RECORDED AREAS FOR MOVING SAID ONE OF THE TRANSDUCERS IN A FIRST OR IN A SECOND DIRECTION TOWARD THE REFERENCE TRACK TO CONTROL THE POSITIONS OF THE OTHER TRANSDUCERS RELATIVE TO THE REMAINING PART OF THE AVAILABLE RECORDING SURFACE.