Abstract: A laminated case for a magnetic disk having a pair of outer laminae and a spacer lamina sandwiched therebetween. The spacer lamina adds rigidity to the laminated case and controls the height of a cavity in which the magnetic disk is located. A liner for wiping the disk is attached to each of the outer laminae. The liner has a free hanging section which provides the wiping action. The three laminae are ultrasonically welded together by a method which employs a fixture and an ultrasonic welding horn. The method permits the magnetic disk to be tested and discarded without sacrificing the laminated case.

Abstract: A micro disk for data storage has a media portion of flat circular shape with a central opening therein. A hub portion has a pilot protrusion that interfits with the central opening to mechanically lock the media portion against rotation on the hub portion. The media portion is supported adjacent the central opening to maximize the unsupported radial dimension from the media support to the inner recording track. Thus good flexiblity at the inner recording track of the media portion compensates for variations of the spindle-to-head dimension in disk drive systems and makes the disk suitable for double sided, high density, data storage applications. A modified hub portion is centered on a drive spindle by a leaf spring within the hub portion.

Abstract: A micro-floppy diskette has an outer relatively rigid jacket with a pair of aligned transducer access apertures; an inner containment cup assembly rotatably received within the jacket, the cup assembly including a pair of flexible cups sealed about the periphery and a pair of flexible annular wiping elements secured to the inner surface of each cup member; and a flexible recording disk rotatably received within the cup assembly. The cup members and wiping elements have mutually aligned cut-out portions which expose the disk recording band through the jacket access apertures when the cup assembly is rotated to an open position. When the cup is rotated to a closed position, the recording disk is shielded from ambient by solid portions of the jacket. One of the cup members has a protruding lug arranged in sliding contact with an inner surface of the jacket to bias the disk to a disk operating plane when the cup assembly is in the open position.