That might be the reason for your trouble. It seems to me, that you still have parts of the boot sector (made by your first test without Raid) on the start position of your Raid array.Tip: Do the formatting of both hdds and then try to enable the bootable option. Yes, that is the newest one. I have no experience with that version. That was a mistake. You should have taken the NVATABUS.INF off the LEGACY subfolder. Athough both files are very similar, the NVATA.INF has only informations to install the - not-existant - NVATA.SYS. Okay, I tried doing the formatting for both hard drives and then building the RAID array and trying to set it to bootable. No luck, still grayed out. I tried building the array, booting off a different hard drive, and then formatting the whole array. Then tried rebooting and seeing if I could make it bootable. Still no luck. Tried pulling the drivers from the Legacy folder as you suggested and using a CD with SP2 integrated. No luck. Tried tuning that installation into an "unattended installation, no luck. Tried pulling the files from the SATARAID folder, with the extra files you suggested, and putting them on a floppy to install during a WinXP2 install. No luck. Next I guess I'll try a fresh nlite build of SP2, the sataraid/ide drivers (with the legacy .inf), and the unattended and see what happens When I started making this machine last week, I was hoping to finish with it before I went on vacation. I spent 1/2 a day putting the pieces together, I didn't think I'd devote another week (or more) of my off hours time to getting the OS installed. :angrym: