Hi Youri   
   Here's an example to find a drive letter given its serial number:   
      
   set serial=78EFF2DC   
   for /f "tokens=1,2*" %%A in ('powershell.exe -noprofile -command   
   "&get-ciminstance Win32_LogicalDisk| Select-Object DeviceId,Volu   
   eSerialNumber|Format-Table -HideTableHeaders"') do if %%B == %serial% set   
   letter=%%A   
      
   To filter on the volume label instead of volume serial, replace    
   olumeSerialNumber with VolumeName.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)