G0m3r619 :
I hope someone here can help me. I have two 6TB mirrored drives in my Windows 10 system. I upgraded to motherboard and reinstalled Windows. Now Windows says my 2 dynamic drives are invalid. I have a backup set as well. I hooked them up and Windows says they are invalid as well. I know they aren't bad. What can I do to fix this?
Vincent is right, raid containers configured on a given board or raid controller card are non transferable, unless you maintain the original motherboard/raid controller. You have 2 options:
1) hook up the raid 1 drives to the new motherboard, create a new array and copy all your data (if accessible) back.
2) if your data is not accessible, hook up the raid 1 drives to the old board, copy your data to one 3rd hard drive, then move the raided disks back to your new board, recreate new raid1 array, & recopy your data from the 3rd disk to the newly created array.
The above 2 options are the safest, fastest methods, but there are plenty other options that might or might not work such as attempting a rebuild of your old array on your new board using unix dev tools, but I'm inclined to go with my option 2 given your easy scenario of just 2 disks and only 6TB of data.
P.s. remember to re establish your backup array disks once your data is fully copied back.
Also I would give "storage spaces" a try if I was you, it works beautifully on 2 drives, and most importantly, easily transferable to another machine, really plug & play!