Thanks for the info. I have an MSI GF615M-P33 v1.3 motherboard with Nvidia 7025 and Nforce 630a+. I set up a RAID 5 array at the BIOS / RAID setup level using 4 2TB drives, and want to be able to boot from it. When Windows 7 installed, it clearly saw the single large array, but once installation completed, I had only a 1.8TB "drive". From this thread I now know that I can't have a 5+TB partition, and I'm going to have to subdivide the space. However, since only 1.8TB is showing up in Disk Manager, I now gather that I didn't have the proper RAID drivers available during original Windows installation, and that I should find the right ones for my MB (that's still problematic in itself!!) and re-install, being careful to watch for the opportunity to use "Advanced Options" -- at which time I should get the RAID drivers bound in and then should be able to see a larger single volume that can be divided into 2TB chunks (since I can't use GPT because I want to be able to boot from the RAID, and while there is evidence that GPT can be booted from, it's evidently only true for 64bit systems with UEFI, which I don't have. See http://msdn.microsoft.com/en-us/windows/hardware/gg463525.aspx).
My question is this: I've had to put at least =some= effort into updates, etc. I'd prefer not to lose all of that. Can I do a backup to an external drive, re-do the installation, and restore the backup and be back where I was, only with Disk Manager now able to make productive use of the entire array?