FDF_MOTORON
sc->flags &= ~(FDF_MOTORON | FDF_MOTOROFF);
if ((sc->flags & FDF_MOTORON) == 0) {
sc->flags |= FDF_MOTORON;
FDSETMOTOR(sc->flags & FDF_MOTORON); /* set motor to unit's state */
if (sc->flags & FDF_MOTORON) {
if ((sc->flags & FDF_MOTORON) == 0)