i dont no much abouy emachnies, but if u wanna recovver ur computer, ur gonna need the disk. if u have a partition stored on ur hardrive then u can use that. I have an HP with the recovery in the hardrive so i can just take it back any time i want. but if u do have a partition on ur hardrive, u might wanna look at ur manual for ur computer to c how to activate it and take ur comp. back to the when u got it.