Index: /trunk/src/VBox/Main/ConsoleImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/ConsoleImpl.cpp	(revision 20133)
+++ /trunk/src/VBox/Main/ConsoleImpl.cpp	(revision 20134)
@@ -6795,4 +6795,8 @@
          * HardDisk interface is merged.
          */
+        pLunL2 = CFGMR3GetChild(pLunL1, "AttachedDriver");
+        AssertReturn(pLunL2, VERR_INTERNAL_ERROR);
+
+        CFGMR3RemoveNode(pLunL2);
         rc = CFGMR3InsertNode (pLunL1, "AttachedDriver", &pLunL2);      RC_CHECK();
         rc = CFGMR3InsertString (pLunL2, "Driver", "TransportAsync");   RC_CHECK();