This includes being in that path in a command prompt or any remote mounts. You could also add a "/V /FP" to your robocopy command to see if it's even touching it and hopefully, if it is, see why it's ...

the /XD is just to ignore system files that were hanging up the copy. I'm attempting to migrate from an old san to a new one and have about 6TB of data to work with, and after running that command ...