Ok ... explanation: By not selecting a GPT/UEFI option, it would have been necessary to create virtual disks (at least the boot VD) smaller than 2TB so that Windows could use and boot to it (why they made additional smaller VD's, I'm not sure).  At this point, you have four options: 1) Live with it as is (I personally would not). 2) Won't require reinstall: 3) Will require reinstall: 4) Will require reinstall or backup/restore:
I just got my new Dell T620 Server today, I ordered it with (4) 2TB hard drives in RAID5 I also configured it with an 80GB OS partition when I bought it. Got it today, and I am a bit confused how its showing the hard drives. I have the 80GB OS Partition, shows as volume C:  which is good. Then I have four other volumes... D: 1.8TB  DataPart2E: 1.8TB  DataPart3F: 57.9GB  DataPart4G: 1.72TB  DataPart1 I know that I can go into the Server 2012 settings under File and Storage and join them in a Storage Pool and it should show as one drive letter then, correct? But, is that the way I should do this? And how do I confirm that RAID5 is actually working, so that if a drive fails one day, I can simply swap it out like I should be able to. I just figured that if I ordered the server with 4 drives in RAID5, and told it to do an 80GB OS partition, that when I got the server I would have one volume for the OS, and one for data.
Help me confirm my new server's RAID 5 is setup correctly. PowerEdge T620, 
Server 2012