A control disk was a piece of technology that controlled guardian droids. At some point between 19 and 15 BBY, the protocol droid C-3PO dressed in the empty shell of a guardian droid in order to subdue the Fromm Gang while aboard Lonn Idd's repair station. Fromm fell for the ruse and demanded that Lonn Idd's daughter, Nikki Idd, hand over the droid's control disk, but she instead sprayed him in the face with Nova Starlight perfume.