Hi mdes, I'm struggling with drive letters assignment and raised my question in the German nLite forum. Another member was so kind to link to your thread here in the MSFN forum. I want to integrate your mapdrive-cmd. tool into my nLite Custom CD for Win XP. I have already W2K installed on a system partition of my first IDE harddisk which consists of three partitions now, e.g. 3 drive letters. I have also one raid-1 system (1 drive letter) two optical drives (2 drive letters) and a cardreader with four (virtual) drives installed (4 drive letters). I created an nLite-CD and installed WinXP in the third partition of the IDE-harddisk. However, WinXP assigns the drive letters not in series, but I want the order on the IDE-drive as follows: C: "W2K_SYSTEM", D: "DATA" and F: "WIN_XP". (E: is used for the RAID-drive). When the installation procedure was terminated, WinXP assigned J: to the "WIN_XP"-partition. I cannot rename the "WIN_XP" system partition, as WinXP refused to rename the system partition, of course. As you are experienced with this business, can you tell me whether your program is able to reassign system drives also after installation had been finished? I have to do this prior to install WinXP, e.g. integration of your program into the custom installation CD in unattended mode? Maybe other member can give me some help. Thanks so far Aemetz