AFAIK Apple has a 800K disk format. Neither 880K nor 720K, but 800K.
Only with a HD drive it can read 1440K disks (same sector format as PC HD floppies but Mac file system).
IIRC with ShapeShifter an Amiga is able to read and write 800K disks, but I doubt that an Apple can be made to read 880K disks.
