Dongle-disk
/don'gl disk/ (Or "key disk") A kind of
dongle consisting of a special
floppy disk that is required in order to perform some task.
Some contain special coding that allows an application to identify it uniquely, others *are* special code that does something that normally-resident programs don't or can't.
For example,
AT&T's "Unix PC" would only come up in
root mode with a special boot disk.
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Jargon File]