To ensure positive engagement between the drive spindle and the stamping during use, and to otherwise facilitate a desired smooth rotation of the flexible disk within the disk housing, the drive spindle is permanently magnetized and the Deep Drawn Part is a magnetic metal. Thus, the stamping is held against the end of the drive spindle during rotation. But, the magnetic attraction between the parts has to be sufficiently weak to both enable easy disengagement of the spindle from the stamping and not interfere with the function of the data storage disk. Inasmuch as there are millions of floppy disk drives in the field, any improvement in disk or stamping construction ought be compatible with the design of existing disks and disk drives, for commercial reasons.
If not, disks with a new type stamping could be either too weakly or too strongly attracted to the drive spindle, adversely affecting use of the whole floppy disk-drive system. In addition to the above mentioned wear resistance and magnetic properties, the stamping must have corrosion and oxidation resistance. A stamping material reaction product which produces flaking or crumbling debris cannot be tolerated. And, a floppy disk stamping must have a low cost and be attractive in appearance. The cost of a stamping will depend on, among other things, the intrinsic material cost, and other required processing. Typically, a stamping is about 0.012-0.013 inch thick. In comparison to many other iron base materials, Type 430 steel has a relatively high intrinsic cost.
Thus, in the continuous search for mini-floppy disk product improvement, there is most particularly a need to reduce cost while achieving equal or better function. However, any improved disk must have a stamping which has magnetic properties compatible with the system which comprises the Type 430 stamping. The combination of performance requirements has prevented the use of what might seem to be likely engineering choices in other materials and combinations. The mini-floppy disks described above are one type of removable information storage devices. Such coatings have been in wide commercial use since the 1940's.
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