If you cast your mind back to the nineties, you'll remember that floppy disks were, in fact, not floppy -- at least not on the outside. Rather, the flat, circular magnetic disks that contained data were encapsulated within a hard plastic protective shell, adding rigidity to the format.
Source : https://www.pocket-lint.com/why-discs-dont-have-a-built-in-protective-shell/
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