Abstract: The addition of water and an inverse micelle forming surfactant in an appropriate molar ratio to the organic binder used as a coating for magnetic recording disks results in the formation of micropores of uniform size and distribution in the coating when the water evaporates during curring of the coating. The size and number of the micropores is controlled by the water/surfactant molar ratio, the amount of water and the amount of surfactant. This permits the design and control of the amount of liquid lubricant retained in the disk coating.

Abstract: A magnetic recording device employing a thin foil member is fabricated by radially compressing a ring member, securing the periphery of the foil member to the compressed ring, releasing the compression on the ring so that it expands to produce tension in the foil member.A magnetic coating may be applied to the foil member either before or after securing it to the ring member.

Abstract: A magnetic recording device employing one or more thin circular foil members which are secured to a supporting member on at least the outer edges of the foil members. In one embodiment, the foil members have central openings therein, with the central opening in one foil member being larger than the opening in the other foil member. A clamping and spacing member is secured to the foil member having the smaller opening and extends through the larger opening in the other foil member to both provide a means for transmitting rotational force to the structure and to provide for spacing between the structure and an adjacent structure in a recording assembly.In an alternate embodiment, one of the foil members has a central opening while the other does not, and rotational force is transmitted through the foil without the central opening. As additional alternatives, the foils may have central openings of equal sizes and be secured to support members either at their outer edges or at both their inner and outer edges.