Is it at all possible to firstly assign the CD drive to say z:\ during the unattended install and then create say a D: and E: formated as NTFS. At the moment I ran a the following scripts after logon. Move CD drive: Diskpart select volume d assign letter=z Create Drives Diskpart Select Disk 0 Create partition primary size=15355 assign letter=d create partition primary assign letter=e But it seems not to work everytime.