BLK_STATE_CLEANMARKER
case BLK_STATE_CLEANMARKER:
return BLK_STATE_CLEANMARKER;
case 0: return cleanmarkerfound ? BLK_STATE_CLEANMARKER : BLK_STATE_ALLFF;
return BLK_STATE_CLEANMARKER; /* don't bother with re-erase */
return BLK_STATE_CLEANMARKER;