Hi Youri   
   That either means the volume with the given serial number (78EFF2DC in the   
   example, I assume you set this to the volume serial you're interested in), or   
   the powershell command did not return a row for your serial number (eg if the   
   disk is not available).   
   What is the output when you run the powershell command itself? ie:   
      
   powershell.exe -noprofile -command "&get-ciminstance Win32_LogicalDisk|   
   Select-Object DeviceId,VolumeSerialNumber|Format-Table -HideTableHeaders"   
      
   This should list all your volumes and their serial numbers.   
      
   regards   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)