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Morning all, I’ve been looking at an issue for the last couple of days that has me somewhat confused. I know there have been other posts regarding this but I’ve not yet seen a definitive reason behind it… We have a small number of systems in the environment that have two physical drives for example a 75GB and a 300GB drive, meaning the preferred setup would be: Disk 0 (75GB) 200 MB: System reserved 50GB: OSDisk 24GB: Data Partition Disk 1 (300GB) 300GB: Extra Can someone please explain why in Win PE these disk randomly swap between Disk 0 and Disk 1?? I need to ensure that in a system refresh scenario these desktops only ever have W7 Enterprise installed to Disk 0 (in the example above) thus leaving Disk 1 alone. We are using the OSPart task sequence variable at the apply OS Phase so I am going to try to use the following script that I believe Niall had a hand in creating in order to target the current partition that has Windows installed: <job id="GetDriveletter"> <script language="VBScript" src="..\ZTIUtility.vbs"/> <script language="VBScript"> dim driveSearch Set objFSO = CreateObject("Scripting.FileSystemObject") Set colDrives = objFSO.Drives For Each objDrive in colDrives driveSearch = objDrive.DriveLetter & ":\\Windows\\explorer.exe" strComputer = "." Set objWMIService = GetObject("winmgmts:" _ & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2") Set colFiles = _ objWMIService.ExecQuery("Select * From CIM_DataFile Where Name = '" & driveSearch & "'") If colFiles.Count < 1 Then Else oEnvironment.Item("OSPART") = objDrive.DriveLetter & ":" End If Next </script> </job> I would still very much like some insight as to why the Disk numbers change at what seems to be random intervals….is it a hardware issue i.e. symptom of using SATA drives, or that OSD prefers the larger drive.... Thanks. Rich.