It it my understanding, (I could be wrong) that any installed game required the DISK, to be able to play. As this would prevent from passing a single game through the neighborhood. The load times are long in DKS, even with an installed game.
UNKNOWN: Friends help you move...True friends, help you move bodies... E.A.P.: Blood was it's Avatar and it's seal. E.A.P.: Stupidity is a talent for misconceptions.