Abstract: A magnetic recording device for non-contact recording on a flexible disk employs a Bernoulli plate to stabilize the rotating disk. The plate is slightly concave and has a number of small orifices therein through which air is drawn by the disk rotation to produce a thin, cushion of air between the plate and the disk.

Abstract: A disk accessing apparatus and method are disclosed for creating an axial spacing between two adjacent disks of a rotating disk stack. The accessing apparatus is mechanical and operates from one end of the stack of disks with one portion of the apparatus being movable axially with respect to the stack of disks and received within central apertures of the disks to contact at least one disk thereat and move the contacted disk axially away from an adjacent disk to create a transducer access opening therebetween. The apparatus can have a variety of configurations including utilization of axially displaceable disk engaging tumblers and/or pins axially movable through apertures or offsets at the central portion of the disks, fingers axially movable to engage disk tabs within the central apertures of the disks, and/or disk actuating, rotatable screw threaded shafts.

Abstract: A thin sheet of electrical grade aluminum is secured to a thin substrate sheet of epoxy/fiberglass or polyimide/fiberglass to form a multilayer card. This card is processed by printed circuit techniques to form the electrical circuit pattern of a printed circuit motor armature. The surface of the aluminum sheet which confronts the substrate sheet is processed in a manner to have a continuous pattern of oblong depressions generally normal to the surface. The major axes of these depressions are generally aligned with each other, and define the direction of the higher adhesion strength. The major axes of these depressions are in alignment with the direction of the electrical conductors constituting the armature circuit pattern. The aluminum surface, containing these depressions, includes a thin, clear, continuous unsealed anodized coating.