Originally Posted by
fatiguedout so which option do i choose to initialize it with.. and i used to have a drive letter assigned to the pool. why would it remove itself?
when i do initialize it. are there any chances of loosing data?
Hi friend! I have never been where you are. I do not understand a pool. Did you read the entire link from HTG that I attached. You upgraded to a new OS(W10)??? That's all I can find by searching your problem. Will you lose data?? IDK. Maybe another member has more suggestions for you!

I have never know anyone with 4 external drives in a poll with that much data. That would scare me also. Good luck. Post back when you find a solution!