tofro wrote:You cannot re-format a disk that was originally formatted on a DD drive on an HD drive. The tracks are wider on DD and a HD drive is not able to erase all of the information the DD drive has put on the disk. Such disks either need to be erased entirely using a (very) strong magnet or need to be re-formatted on a DD drive.
Are you sure? DD and HD 3.5" drives are both 80 tracks. The difference in capacity being the number of sectors per track.
Are you thinking of the old 5.25" disk drives? Where the tracks were narrower on HD drives than DD drives. one being 80 trace, and the other 40 tracks.
Also I don't think that the later QPC2's, (Version 4) Actually format the floppies any more. It just wipes the data on the existing sectors.