Where is the primary disk group in Vista

Before Vista (2003, XP) Windows had a key in the registry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\dmio\Boot Info\Primary Disk Group 

      

        
        
        
      

    

which indicates which dynamic disk group is imported / active in this installation.

With Vista, this key has disappeared. However, the OS needs to somehow preserve this information, since the same disk group when imported to another machine will not be automatically imported again (i.e. if the dynamic disks are in a SAN, every time Vista boots, other Vistas see the discs as foreign).

My short question is where is this information (primary disk group for this machine) stored in Vista p>