LouG said:
After closing this thread (believing it to be solved) the problem of usb2 hard drive not mounting returned. In desperation, I tried switching the cable connector from one of the usb3 drives to the failing usb2 drive - which immediately worked. I have replacement cables for all my usb hard drives on order...
I'm sorry for not replying, I remember to have this thread in one of the tabs, looks like I close them all mistakenly