diff --git a/operation/mkraid.sh b/operation/mkraid.sh
index 3d763fc..7a421d0 100755
--- a/operation/mkraid.sh
+++ b/operation/mkraid.sh
@@ -164,8 +164,7 @@ testBeforeMkraid(){
 	#      used"
 	for i in $DEVICELIST
 	do
-		if [ mdadm -Ds -v | grep $i ];then # >>${LOGDIR}${LOGFILE} 2>>${LOGDIR}${LOGFILE}
-#		if [ $? == "0" ]; then
+		if [ mdadm -Ds -v | grep -w $i ];then
 			ERRNO="6"
 			return 1
 		fi