I am a skilled PC builder; I have built many, but welcome to the world of 4TB drives. I am using three 4TB drives to start, making for 12TB (I can add more).
I tried installing Windows 7 on the 4TB, and then add the other two. That was no good, the first disk had 2TBs to use and a 1.7 partition that was unusable. So a 128GB SSD runs the OS and after reformatting the "2TB" drive on another PC, I have sort of have a 12TB storage PC.
The problem is copying a large file to there (say, 30G, can make Windows no longer see that drive. I thought the issue was one drive, but now a second drive has that issue, as well. The C drive is the SSD, the D: drive seems OK, it has nothing copied to it yet. So I have not seen what it will do, yet.
Do I need to reinstall Windows? Why does Windows lose a drive, only to get it back with a restart? Then start the copying and half way through, the drive is missing until another restart.
PC has Sabertooth 990FX M/B, CPU is FX-4100, has 8GB memory, and six SATA ports.