On 12/08/2018 12:23 PM, Baron wrote:
> If I have a HDD connected via a USB adaptor, I've found that after an 
> initial plugging and use, then safely removing it, going back to it, 
> in the same session, it may or may not be recognised.

I've always had a similar problem when using Safely Remove.  The solution is
to use Unmount rather than Safely Remove; then you can mount & unmount it as
many times as you like with no problems.