My son has a home built Desktop with ASUS P877-VLX Mobo that was upgraded from Windows 7 to Windows 10. The computer has a 250 GB SSD for the C: Boot Drive and 2 mirrored 3TB drives for Data as well as another 3TB drive for data. I configured a new 4TB WD Black drive on my own Windows 7 computer as GPT and copied all of his data off of the 3TB drive to it. Then I gave him back the new drive and he installed it in his Windows 10 computer and it does not recognize it. It sees the drive in the BIOS and it can see the drive in Disk Management but shows it as 2 partitions, one 2048 GB partition as GPT and another 1678 GB Unallocated partition. Disk Management has all options grayed out and the only option it to take the drive offline. Nothing shows up in Computer. We downloaded and installed the Windows 10 Anniversary update hoping that it would solve the problem but still not working.
We have checked on line but have not been able to find anything to fix this? Any help or suggestions would be greatly appreciated.