My goal is to boot from raid with a clean install of windows xp pro, and maintain all data, and programs functional on my original c drive on the primary ide. Later, or if easier now I want to install all the programs to the raid array and use the other drives for backups and data storage. Any other Ideas would be great. Looking for speed and redundancy without purchasing additional hardware. Here is what Ive got. Asus p4t533/pa board w/onboard promise raid set up with 2 maxtor 40 gig 8 cache 7200 drives set as master and 0 striping, on the primary ide I have 1 wd 120gig 8 cache 7200 drive, 1 maxtor 40 gig 8 cache 7200 drive both drives set to cable select. Here is the problem I am having, When I boot from raid, the new c drive, once into windows the original drives on the primary ide loose their letter assignments. I have gone into disk management and tried to assign a letter but it will not let me to either drive the 120 or the 40 thus no letter no drive. Funny thing is Hard drive tach 3.0 will test the drive and work fine. What am I missing. some additional info if it is helpful, both 120 and 40 drives have had at one time a opperating system installed, also if I switch back the bios to boot from the ide and not the raid array the system will boot up fine off the os on the original 120 gig c drive without any problems, but the raid is disabled and if enabled restarts the system.