Vista x64 on a Asus P5Q board with ICH10R controller that can be set in AHCI or RAID mode. System was built using AHCI mode with the original drivers. I want to add a RAID-1 array for storage. At first I thought I could stay in AHCI mode, but the system wouldn't recognize an array since RAID drivers are required. But switching to RAID mode, it couldn't find the system disk since AHCI drivers are required. Catch-22. Somewhere I heard that the latest drivers fix that, so I installed the latest Intel Storage Matrix Manager, which did something to the drivers. Whatever it was, the system wouldn't boot in either mode due to a "corrupt boot image". Not sure what I did, but I eventually got it to boot using AHCI mode. The new drivers are installed (apparently both modes now use the same drivers) so the system now sees an array formed by the ICH10R BIOS setup. Partial victory. The problem is, there are several features of the Intel software that are only available in RAID mode. So I still need to switch to RAID mode. What's the secret?