Yeah I actually had a couple machines that used them. One was an Altos something like this http://www.vintage-computer.com/altos8000acs.shtml http://www.vintag

Yeah I actually had a couple machines that used them. One was an Altos something like this http://www.vintage-computer.com/altos8000acs.shtml http://www.vintage-computer.com/altos8000acs.shtml and the other was some single cabinet scientific job. I forget if the hard-sectored disks would work in a soft-sectored drive or not; perhaps it would just ignore the holes.