Issue with Hard drives not showing up in Windows Installer

Almost the same problem if I am reading right. Take out Raid and you can see the SataII drives and the Sata DVD in the main Bios. Implement a Raid 1 Array and nothing is recognized in the main Bios but everything works perfectly. From what I have been reading there is the possibility that the drives, when Raided, come under the control of whatever Raid Bios your machine uses. I have reloaded the Raid1 Array and Windows 4 different ways in the last 2 days and the results are the same. Shows up in the device manager, the bootsequence part of the bios and everywhere else BUT the main Bios. Is this normal? Is this a Bios glitch that should be addressed by the manufacturer?....or is it something else.....