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Wanting to reduce the volume floppy disks had, Wang developed a smaller system.
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Apple II had a 5.25 inch floppy disk that was small and accessible
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Now developed at 3.5 inches
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The floppy disk was replaced by the USB cord, being a far superior version and doing it at the same functionality
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Now the previous USB cords could be made into storage devices as USB sticks
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The third and current final version of the USB. A much smaller but still effective storage device like the USB 1 and 2.