Physical disk resource does not successfully move to another cluster node

We experienced a problem when trying to move a physical disk resource from one cluster node to another where the move operation is unsuccessful. This turned out to be because some of the hard disk signatures were missing from the Windows registry. The solution to this is described in the following KB article –

http://support.microsoft.com/kb/932465

The hotfix described has been applied to all the Exchange virtual server nodes. This alone did not fix the problem and we had to edit the registry as described in method 2.