How could I make that right? What is the problem?
Seeing the MBR error. Both drives are seen as one, so total over the 2TB OS limit.
You need to reformat both drives to GPT(uefi) due to win10 total single drive limit of 2TB in MBR (legacy) boot.
http://www.tenforums.com/ has Tutorials on converting.
Retrieving data ...