Yes UEFI has replaced the BIOS. Under advanced in the UEFI you should have a setting that says something like "storage configuration" change that to RAID and save your settings and reboot. During reboot you will see another screen come up it will be the RAID configuration utility. Eenter that utility and configure your RAID 0 array. This will make your 2 hard drives 1 1TB hard drive. WARNING you will loose all of the data you currently have on your disks you will have to reinstall windows and your risk of boot drive failure and data loss will increase.