MULTI_FUNCTION_SD
#define IS_MF_SD(bp) (bp->mf_mode == MULTI_FUNCTION_SD)
bp->mf_mode = MULTI_FUNCTION_SD;
bp->mf_mode = MULTI_FUNCTION_SD;
bp->mf_mode = MULTI_FUNCTION_SD;
case MULTI_FUNCTION_SD:
case MULTI_FUNCTION_SD:
case MULTI_FUNCTION_SD: