diff --git a/fullusb.sh b/fullusb.sh
index 4e3e6ba..df70a39 100755
--- a/fullusb.sh
+++ b/fullusb.sh
@@ -21,8 +21,8 @@ done
 [[ $i -eq 0 ]] || exit $i
 
 # this part depends of the event
-keylabel="OPTIQUE2015"                      # label of the keys
-wherethefilesare="/homes/carre/optique2015"         # where are the files you need to copy
+keylabel="CHOCOLAS"                      # label of the keys
+wherethefilesare="/ipr/home.ipr/jegardai/chocolas"         # where are the files you need to copy
 badkeyid="abcd"                                # depends of key models (lsusb)
 goodkeyid="058f"
 
@@ -30,6 +30,11 @@ goodkeyid="058f"
 keysearchbadid=$(lsusb | grep $badkeyid | wc -l)
 keysearchgoodid=$(lsusb | grep $goodkeyid | wc -l)
 keysearchid=$(($keysearchbadid+$keysearchgoodid))
+mountpath="/mnt/usbkey"
+
+# MD5SUM check
+sourcemd5="/tmp/source_directory.md5"
+destmd5="/tmp/destination_directory.md5"
 
 case $keysearchid in
 	0) printf "%40s\n" "${red}Alert: No usb key detected${normal}" ;;
@@ -40,6 +45,11 @@ case $keysearchid in
 		if [[ $keysearchid != $nbsd ]]; then
 			printf "%40s\n" "${red}Alert: Error 1${normal} Keysearchid: ${keysearchid}"
 		else # if everything is ok
+			# Generate the md5sum for source directory
+			pushd "${wherethefilesare}"
+			find . -type f -exec md5sum {} \; | sort > "${sourcemd5}"
+			popd
+
 			for i in $(seq 1 $keysearchid) # from 1 to $keysearchid by step of 1
 				# if $keysearchid=1: for i in 1
 				# if $keysearchid=2: for i in 1 2
@@ -49,15 +59,29 @@ case $keysearchid in
 				parted /dev/$k mkpart -a optimal primary fat32 0% 100%
 				mkdosfs -F 32 -I -n $keylabel /dev/${k}1
 				# fatlabel /dev/${k}1 $keylabel # Cette commande est remplacée par l’option -n de la commande précédente
-				mkdir /mnt/usbkey$k
-				mount /dev/${k}1 /mnt/usbkey$k
-				cp -r $wherethefilesare/* /mnt/usbkey$k/
+				mkdir "${mountpath}"$k
+				mount /dev/${k}1 "${mountpath}"$k
+				cp -r $wherethefilesare/* "${mountpath}"$k/
 				sync
-				umount /mnt/usbkey$k
-				rmdir /mnt/usbkey$k
+				# Generate the md5sum for the mountpoint
+				pushd "${mountpath}""${k}"
+				find . -type f -exec md5sum {} \; | sort > "${destmd5}"
+				popd
+				# Umount the key
+				umount "${mountpath}"$k
+				rmdir "${mountpath}"$k
+				# Compare the md5sum
+				diff -q "${sourcemd5}" "${destmd5}"
+				if [[ $? -gt 0  ]]; then
+					printf "%40s\n" "${red}Error: MD5 diff detected.${normal}";
+					exit 1
+				else
+					printf "%40s\n" "${green}MD5 check OK for ${k}.${normal}"
+				fi
 			done
 			printf "%40s\n" "${green}DONE${normal}"
 		fi ;;
 	*) printf "%40s\n" "${red}Alert: Error 2${normal}" ;;
 esac
 
+exit 0