+VT_BUS_USB=""
+if [ -n "$ID_BUS" ]; then
+ if echo $ID_BUS | $GREP -q -i usb; then
+ VT_BUS_USB="YES"
+ fi
+else
+ if $BUSYBOX_PATH/ls -l /sys/class/block/${1:0:-1} | $GREP -q -i usb; then
+ VT_BUS_USB="YES"
+ fi
+fi
+
+if [ -n "$VT_BUS_USB" ]; then