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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