commit 265e04205e4766f459d4ced516dbd784cf2ca57f
Author: Cole Robinson <crobinso@redhat.com>
Date:   Tue Feb 7 17:13:59 2012 -0500

    Add VDI to disk format list
    
    People actually distribute images in that format:
    
    https://bugzilla.redhat.com/show_bug.cgi?id=761300

diff --git a/src/virtManager/uihelpers.py b/src/virtManager/uihelpers.py
index c274592..3ba4a71 100644
--- a/src/virtManager/uihelpers.py
+++ b/src/virtManager/uihelpers.py
@@ -397,6 +397,7 @@ def build_storage_format_combo(vm, combo):
     formats = ["raw", "qcow2"]
     if vm.rhel6_defaults():
         formats.append("vmdk")
+        formats.append("vdi")
 
     for m in formats:
         dev_model.append([m])