RAID mirror degraded & split... clues?

So I’ve got an MSI Neo2 Platinum mobo (Athlon 64 Clawhammer), with NVRAID. Still using the drivers the board shipped with.

I have four 160Gb drives, using SATA 1 through 4. SATA 1 and 2 are a RAID 1 array ( C: ), SATA 3 and 4 are a RAID 0 array ( E: – the DVD+RW is D: ).

This morning I booted, and the BIOS reported that the RAID 1 array was degraded. Got into Windows, and now instead of a C: and E: drive as previously, I have a C:, E:, and F: drive! C: and F: are the two SATA 1 and SATA 2 drives that previously were happily part of the same array.

The C: drive still seems current – it has everything up to my latest Quicken work last night – and I have already backed it up to the RAID 0 array. I’m also going by Fry’s tonight to get an external 200Gb backup drive, and I’m going to back up the whole thing again to that.

Once THAT’S done, any suggestions? I have yet to touch the RAID BIOS so it may be as simple as telling it to rebuild the array, but I figured I’d ask here in case I’m in even more of a minefield than I think I am :-)

From now on, no more RAID on the boot drive!