Abstract: A disk-jacket assembly including a flexible disk rotatably disposed in a square jacket having radially extending registering slots in its two thicknesses for receiving a pair of opposite transducers or alternately a single transducer in one slot and a pressure member in the other slot. Panels of porous low friction dusting fabric are disposed between the faces of the disk and the opposite inner faces of the jacket. The dusting fabric has slots coincident with the slots in the jacket, and the dusting fabric slots are wider than the jacket slots particularly for spacing the disk entry side edges of the jacket slots from the adjacent edges of the fabric to substantially prevent loose fibers on the fabric extending into the jacket slots.

Abstract: A transducer assembly including a pair of transducers positioned directly opposite each other on the two faces of a flexible magnetic disk and a pair of gimbal springs each for supporting one of the transducers. The gimbal springs are so adjustably bent that the transducers bear with substantially equal, opposite and uniform pressures on the opposite sides of the disk. A method is disclosed for measuring the forces exerted by the transducers acted on by the gimbal springs including the positioning of three balls on the active face of each of the transducers with strain gauges measuring the forces on each of the balls. A first one of the balls is located on the transverse center line of the active face of the transducer while the other balls are equally spaced from this center line; and all of the balls are equally spaced from a longitudinal center line of the face.