Hi again! After five different experiments, I've made some progress, but not yet where I want to be... How do I force the assign partition/drive letters while using an nLite CD with winnt32.exe from BartPE?? So far I have learned how to make a BartPE with my slipstreamed Win XP Pro SP3 CD. With BartPE I can boot the system and use diskpart to partition the nVRAID stripe. I also figured out how to use add-on maker to build a dotnet35.cab file that includes a batch file to setup RunOnceEx execution of dotNet35SP1_1.03.exe from RyanVM forum. So I can make a WinLite iso using nLite, WMP11 Slipstreamer, several addons, and drivers for all my hardware. At present, here is my sequence: 1. I boot-up, on my second optical drive, with BartPE, and I use diskpart to create three (3) primary partitions, and assign them letters, so that: Volumes 0-2 are my three optical drives Volume 3 is my first primary partition, BOOT, 20GB, assigned W:, and made active Volume 4 is my second primary partition, CORE, 40GB, assigned C: Volume 5 is my third primary partition, DATA, ~410GB, assigned D: 2. I use FORMAT /FS:NTFS to format all primary partitions 3. I load my WinLite CD on the first optical drive, F: , and open a cmd console, and CD F:\I386 4. I execute WINNT32.EXE /TEMPDRIVE:W /SYSPART:W /UNATTEND:WINNT.SIF 5. The Windows GUImode comes up and goes through the copying phase 6. The the application ends, and I think because of BartPE, I do not get the desired reboot, so I manually restart 7. Upon restart, I use the bios boot menu to select the nVRAID stripe, but I only get a blinking cursor 8. If I reboot normal, I get the "Press any key to boot from CD", after that it tries to boot from the nVRAID, then it starts the textmode Win XP install from the nVRAID, and asks me which partition to install Windows. I can see the three partitions I created, but with letters C: D: and E:, instead of what I wanted, which is W: C: and D: I am thinking of using DetachedProgram to call diskpart.exe, with Arguments to feed a script text file, but not sure that will work... If anybody has any tips or better ideas, I would like to avoid too many more experiments...