/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. [Jargon File] (1998-12-13)