Thanks for the response. I should also say that when originally copying the data from 5TB to 8TB, I left it overnight and when I came back in the morning, my MAC had shutdown. I could not bring it up and had to call Apple support. They managed to my iMAC in shape but could not mount the 5TB and so they were the ones who suggested it was corrupt. However, I now have 3 EHD that will not mount and cannot do first aid on. See attached. I am trying to mount from my laptop and am getting the same scenario as my iMAC.
Thoughts? I am very frustrated right now, I know we have al been there.