You are not finding a setting for RAID On?
There's no setting for RAID OFF. The only two settings are RAID ON and RAID AutoDetect/ATA
Your manual suggests three settings, RAID On, RAID Autodetec/AHCI and /ATA.
Yes, I know. But there's no option for RAID Autodetec/AHCI. The only two settings are RAID ON and RAID AutoDetect/ATA:
http://www.nonags.org/members/rether/Dell%5CIMG_0153-1.jpg
If it isn't working in ATA, try On to see if the driver will see the drive.
That worked!
Actually, if the restore program rewrote the RAID parametric data, the drive should still be seen as one half of a RAID 1, and should be bootable that way. Try On, and if it boots, you should get a message about a degraded array.
I tried booting to Safe Mode first, and it got further than before, but then displayed a message that my system is not configured correctly, and it stopped loading and re-booted itself. I stopped that and booted normally, and it completed booting and went through the whole process of setting up the PC (like a new unit) without ever complaining about the drives or mentioning RAID.
If that works, you can clear the second drive and use the Intel Matrix Storage application to make it back into a RAID if you wish, or you can go through the process of resetting to non-RAID and just use the single drive.
How do I reset it to non-RAID?? There's no option in the CMOS for that.