Sorry if i wasn't clear , the 2 pcs that are running knoppix are only running off of the cd . I (and my wife ) use them to surf the net or do odd chores while the others are tied up or taken apart for upgrdes lol . I generally multitask my pcs , 1 for downloading , 1 for games , etc. . It's not unusual for all 4 pcs to be going at the same time .