Index: /trunk/src/VBox/Storage/VDI.cpp
===================================================================
--- /trunk/src/VBox/Storage/VDI.cpp	(revision 33946)
+++ /trunk/src/VBox/Storage/VDI.cpp	(revision 33947)
@@ -1118,5 +1118,5 @@
     cbSize = RT_ALIGN_64(cbSize, _1M);
     if (    !cbSize
-        ||  cbSize >= _1P * 2 - _1M * 3)
+        ||  cbSize >= _1P * 4 - _1M * 3)
     {
         rc = VERR_VD_INVALID_SIZE;