I have two 1tb My Passport external drives. I keep one at work and one at home, as double redundant backup, as well as to store videos since my Mac only has 500 Gb of memory.
One of the drives is suddenly not showing in Finder. Since I have two identical drives, I tried to reformat the non-working one but keep getting a message saying the operation could not be completed. Does anyone have any suggestions?
My OS is Sierra.