So I finally have a window of time to use... I replaced the belt, and the drive appears to be working (I get proper motion), but I'm getting "Illegal QD" errors when I go through the diagnostic routines, or if I just put the disk in the drive. These are NOT factory QDs. They're smith-coronas which I believe ought to work. But they're blank. So the question is: How do I format this disk? Can I just save to it once? Or is this a thing where I've gotten out of alignment, and if it were in alignment, it wouldn't give me an error, even on a blank disk? That's really the question: do I have an alignment problem or a formatting problem? If it's alignment, I can go twiddle with it. if it's formatting, I think it's possibly more complicated... Thanks Pete