Abstract: A magnetic recording medium disk with substantially improved tolerances comprising:a hub including a center portion and recessed flange portion, the center portion having a planar drive surface; a magnetic medium, including a side zero and a side one; and an adhesive bonding the side one of the medium to the flange of the hub, wherein the side zero of the medium is fixed a precise, desired distance .alpha. from the plane of the drive surface and the total indicated runout of the hub used divided by the total indicated runout of the distance .alpha. is greater than one. A method and apparatus for manufacturing a magnetic recording medium disk with substantially improved tolerances by applying ultrasonic vibrations to the medium and a hot melt adhesive until the precise desired distance .alpha. is achieved.

Abstract: A magnetic recording medium disk with substantially improved tolerances comprising:a hub including a center portion and recessed flange portion, the center portion having a planar drive surface; magnetic medium, including a side zero and a side one; and an adhesive bonding the side one of the medium to the flange of the hub, wherein the side zero of the medium is fixed a precise, desired distance .alpha. from the plane of the drive surface and the total indicated runout of the hub used divided by the total indicated runout of the distance .alpha. is greater than one. A method and apparatus for manufacturing a magnetic recording medium disk with substantially improved tolerances by applying ultrasonic vibrations to the medium and a hot melt adhesive until the precise desired distance .alpha. is achieved.

Abstract: A magnetic recording medium disk with substantially improved tolerances comprising:a hub including a center portion and recessed flange portion, the center portion having a planar drive surface; magnetic medium, including a side zero and a side one; and an adhesive bonding the side one of the medium to the flange of the hub, wherein the side zero of the medium is fixed a precise, desired distance .alpha. from the plane of the drive surface and the total indicated runout of the hub used divided by the total indicated runout of the distance .alpha. is greater than one. A method and apparatus for manufacturing a magnetic recording medium disk with substantially improved tolerances by applying ultrasonic vibrations to the medium and a hot melt adhesive until the precise desired distance .alpha. is achieved.

Abstract: An improved design for a compact floppy disk cartridge is provided in which the wiping fabric is prevented from moving and causing stringers out the head access window. This is accomplished by providing ribs on both halves of the cartridge case which, together with raised peripheral edges on the case, provide an irregular shape. The wiping fabric is cut to a shape which conforms with the outline provided by the combination of ribs and peripheral edges. Thus, the wiping fabric is keyed into the space defined by the ribs and peripheral edges.Other improvements embodied in this design are: a compression return spring for a sliding shutter which is substantially completely covered by the shutter (thus preventing debris from interfering with the spring); and temporary interference fit closure of the cartridge shells to permit non-destructive testing.

Abstract: A handle for use with a computer disk pack memory unit which handle comprises a first and a second part assembled together to provide the releasable engagement of an axle within the computer disk pack and which two-part structure permits the fabrication of the entire handle by holding techniques.

Abstract: A unitary polymeric member for limiting the travel of an air entrance door in the housing of a disk cartridge. First and second anchor portions of the member are attached respectively to the door and the housing. Movement limiting means comprising two rigid links attached in series between the anchor portions by thin hinge sections afford movement of the door between a closed position adjacent the housing with the door closing an air inlet port in the housing and the links in side by side relationship, and a full open position with the links tensioned between the housing and door.