I like many others have the problem of SATA drive in RAID array not booting after removing original IDE drive. I used the Western Digital Lifeguard tool to transfer system over to new SATA HD. Initially I could not even get the single SATA HD to ever boot until I installed second drive and created RAID 0 array. System would boot fine and in fact very fast XP Home Edition load up time compared to IDE time for loading. Now that I want to eradicate the IDE drive I can't. I read somewhere that the original MBR is retained on the IDE boot partition and doesn't transfer when transferring system over to SATA array or single SATA drive. Will the program Partition Magic solve this or is XP repair in order? I hate doing XP repair because of the lengthy reinsallation of several register sensitive flight sim software not to mention my limited reregistering of Norton. Believe it or not , this is the 3rd motherboard I have transferred this WinXP(SP2) to. I was able to do this without having to do XP repair. Uninstalled all chipset drivers and graphics drivers when switching from ATI to Nvidia. System booted up with only a few Microsoft FS9 addon software programs requiring reinstall. I think some of that was do to going from Nforce2 to Nforce4 chipset. Surprised the heck out of me! Thats why when I got this problem with the SATA drives not booting after removing the IDE drives-in fact 2 IDE drives-it drives me crazy. I can live with the extra WD 80 PATA drive but would be nice to free up space. MOBO is ASUS A8N32-SLI with AMD 64 4000+ OC'ed to 2.6GZ. All BIOS settings in order with Mirror array set as primary boot, but hangs up in absence of any of my 2 IDE HD's not being part of system.