diff --git a/src/usbinstall.sh b/src/usbinstall.sh
index 10ae151..99c97fb 100755
--- a/src/usbinstall.sh
+++ b/src/usbinstall.sh
@@ -175,8 +175,7 @@ org.freedesktop.UDisks.Device DeviceIsMounted`
 
 if [ "$DEVICEISMOUNTED" = "true" ]; then
    LANG=C udisks --unmount ${SELECT_USB}1 | grep failed && { 
-	echo "Error: fail to umount the usb key (${SELECT_USB}1)"
-	exit 1
+	errorAndExit "Error: fail to umount the usb key (${SELECT_USB}1)"
    }
 fi
 set_pbar 2
@@ -184,7 +183,11 @@ set_pbar 2
 
 set_status "Formattazione della chiavetta in corso..."
 sudo fdisk $SELECT_USB < ./fdisk_template
+if [ "$?" != "0" ]; then
+   errorAndExit "Error: fdisk ended with error"
+fi
 set_pbar 5
+
 sudo mkfs.ext3 ${SELECT_USB}1 -L openmamba_live
 sleep 1
 LANG=C udisks --mount ${SELECT_USB}1