This also (partly) fixes IBM OS/2 Warp 4.0 floppy installation, where
not all floppies have the same format (2x80x18 for the first ones,
2x80x23 for the next ones).
Signed-off-by: NHervé Poussineau <hpoussin@reactos.org>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>