A mini-floppy disk or like information storage device is comprised of a circle of data storage medium having a central Stamping Part. In use, the stamping is contacted with and driven by a magnetized spindle. The stamping comprises a ferromagnetic substrate and a metal coating. The coating is harder than the substrate, preferably greater than 400 DPH hardness number. The coating is deposited with an amorphous microstructure while the substrate is crystalline. The coating has a nodular surface texture and surface oxide film which provides improved adhesive bond strength, where the medium is joined to the stamping.
Typically, a disk comprises a circular piece of flexible plastic medium coated with magnetic material encased in a rigid plastic housing. Adhered to the center of the flexible plastic medium is a circular cupped metal stamping. The stamping typically has one or more openings, including a square hole in the center and an off-center hole for a drive pin. In use, the stamping is engaged by mating features of a rotating drive spindle of the computer system disk drive. Thus, the disk storage medium is continuously rotated past magnetic heads of the disk drive. Que Corporation, Indianapolis, Ind., the disclosure of which is hereby incorporated by reference.
To enable mini-floppy disks to be frequently inserted and removed from the disk drive system, the drive spindle automatically advances and retracts along an axis perpendicular to the stamping and disk. Since probability dictates that the drive spindle contoured end and stamping holes usually will not align, as the drive spindle pushes against the stamping, it rotates until engagement occurs. In this process, there is metal to metal rubbing contact. The cumulative effect of such rubbing must not be such that galling or wear produce debris which would adversely affect the functioning of the finely crafted data storage surface of the disk.
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