Thanks everyone for your help! I was able to restore one drive back to full functionality. The other two drives I'm still working on but you folks gave me some good information to start in on them. From what I've read on the windows 10 forums from TechNet, it looks like the old Tech Preview was the culprit. My 3TB drive is still visible but I have no read or write access to it. The other 1TB drive is completely unresponsive. I will try the Linux tool as described in the posts earlier recommended here and see if it's a power save thing.

Anyways. I'm sure it will get resolved now so I have marked this as solved. Thanx and +rep to all who helped!