MTF_TAPE_HEAD_DIRTY
if (rval & MTF_TAPE_HEAD_DIRTY) {
rval |= MTF_TAPE_HEAD_DIRTY;
rval |= MTF_TAPE_HEAD_DIRTY;
rval |= MTF_TAPE_HEAD_DIRTY;
rval |= MTF_TAPE_HEAD_DIRTY;
mtget->mt_flags |= MTF_TAPE_HEAD_DIRTY;