Not the Beeb but this copy protection was common even quite early on the Apple II. We we ran our disk drives with the cases off so we could adjust the speed scr

Not the Beeb but this copy protection was common even quite early on the Apple II. We we ran our disk drives with the cases off so we could adjust the speed screw to match track lengths. We had software that would visually feedback the track length so you could get it spot on.