/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 doeSSomething 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)