Hard Drive(s) Formatting Failure(Error Code:600)

Hey, I got an unused EX4100 and I’m supposed to put it on. The system has no errors in the system check and neither do the hard disks. To upgrade to My Cloud OS 3, my assumption was that I need to set up volumes first. However, when I tried to set up a RAID mode, I got the error Hard Drive(s) Formatting Failure(Error Code:600). Now I don’t know how to proceed. I was able to access the hard drive via my Windows computer.
This may be the wrong forum, but I hope someone can help me or point me to the right forum.

Jakob