ASUS P9X79 RAID mode + Win7 blue screen

Goal:
Create hardware RAID1 volume from 2x250GB drives for use as primary backup volume.  I would like this volume to be presented as a single drive to the OS.

Problem:
I am having issues with Windows starting when the SATA mode in the BIOS is set to RAID as opposed to AHCI.  Regardless if there is a RAID volume created or not, once I switch to RAID mode in the BIOS I get a blue screen and Windows will not completely load (bsod is not immediate).

Environment:
Both drives are currently plugged into the same "bay" (single port on mobo with 2x SATA2 slots).  I originally had them plugged into separate what I am calling "bay"'s to potentially increase throughput, but that apparently neither helps nor hurts the current situation.

Troubleshooting:
Every combination available works fine if SATA mode is set to AHCI
No combination works if SATA mode is set to RAID

What appears to be the same problem occurs whether or not the Intel RAID software is installed, even though I am trying/hoping to control this via hardware.

Where we stand:
With both drives initialized in Disk Management while in AHCI mode in the BIOS I am able to create a RAID1 volume.  This however is not the desired solution.
LVL 21
PapertripAsked:
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nobusCommented:
did you use the Intel® Rapid Storage Technology Option ROM utility as described on page 4-20 of the manual?
see : http://support.asus.com/Download.aspx?SLanguage=en&m=P9X79&p=1&s=42
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noxchoGlobal Support CoordinatorCommented:
Your system does not have RAID controller drivers. Install the drivers and then try to change to RAID mode.
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PapertripAuthor Commented:
@nobus yes that utility is available when BIOS is set to RAID mode.  Windows blue screens regardless if there is a RAID volume created or not.

@noxcho I have the Intel C600 ACHI/RAID driver installed from the ASUS website, and it is currently working just fine in AHCI mode.
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PapertripAuthor Commented:
*AHCI/RAID
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noxchoGlobal Support CoordinatorCommented:
What is the BSOD exception number you get?
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PapertripAuthor Commented:
After a few more hours of trial and error I was able to resolve this myself.

Even though the boot drive was not a RAID member, the OS still needed to be installed with the RAID driver if any additional drives were ever destined to be in a RAID.

Before re-installation of the OS I changed the SATA mode to RAID and provided the RAID drivers to the Windows installer via a thumbdrive.  After that everything worked as intended.
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nobusCommented:
that's how it is always done...
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PapertripAuthor Commented:
If it is such an obvious issue, I would've expected a different answer considering my question mentions that Windows is already installed and working fine in AHCI mode but blue screens in RAID mode, indicating that the OS was already installed and done so in AHCI mode.
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nobusCommented:
the reason is the OS needs the driver for the disk controller
you can provide it at install time, or install it later
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