diff --git a/make_usd_card.sh b/make_usd_card.sh
index 3ad5615..1fbbd2c 100755
--- a/make_usd_card.sh
+++ b/make_usd_card.sh
@@ -11,11 +11,20 @@ SD_MOUNT_POINT=$2
 [ "x$1" == "x" ] && display_usage && exit
 [ "x$2" == "x" ] && display_usage && exit
 
+if $(df | grep /$ | grep -q "^$SD_DEV"); then
+    echo "Target and current system device are the same. Can't do that!"
+    exit
+fi
+
 SIMPLEIMAGE_VERSION=${SIMPLEIMAGE_VERSION:-"latest"}
 LINUX_VERSION=${LINUX_VERSION:-"latest"}
 SLACKWARE_VERSION=${SLACKWARE_VERSION:-"14.2"}
 SLACKWARE_MINIROOTFS_VERSION=${SLACKWARE_MINIROOTFS_VERSION:-"01Jul16"}
 
+echo "Going further will wipe ${SD_DEV} and you _will_ lose all data on it !"
+echo "/!\\ LAST CHANCE TO HIT Ctrl-C /!\\"
+read
+
 wget -c https://www.stdin.xyz/downloads/people/longsleep/pine64-images/simpleimage-pine64-${SIMPLEIMAGE_VERSION}.img.xz
 unxz simpleimage-pine64-${SIMPLEIMAGE_VERSION}.img.xz
 dd if=simpleimage-pine64-${SIMPLEIMAGE_VERSION}.img of=$SD_DEV bs=1024