You cannot access RAID settings through the BIOS. It should all be done through Intel Rapid Start. Here is an HP whitepaper that attempts to show how to enable IRST in Windows 8. How much of this have you tried?
You cannot access RAID settings through the BIOS. It should all be done through Intel Rapid Start. Here is an HP whitepaper that attempts to show how to enable IRST in Windows 8. How much of this have you tried?