So currently my gigabyte motherboard has 2-1TB drives in a mirror raid as my secondary drive for data storage and 1 250GB single drive for my OS. In the BIOS I have the setting set to RAID for my hard drives, which I set this after I loaded windows when I first started, but now my 250GB single OS drive needs to be reloaded, but my XP disc will not see the drive since I have it set to RAID. I'm having trouble loading the raid drivers from gigabyte and I thought it would be easier to set the hard drives to AHCI mode and unplug my 2-1TB drives, reload windows on the 250 then plug my 2-TB drives back up then switch the BIOS back to RAID, but I am worried that this will mess up my RAID on my 2-1TB drives?? I would hate to experiment and lose the data on those drives. Will switching modes mess up my RAID???