Adrian  writes:
> In message , Richard Kettlewell
>  writes
>>Adrian  writes:
>>There is a fault with either the disk, or its connectivity, or its
>>power. (Is it powered over the USB connection to the host or is it
>>separately powered?)
>
> Powered from the PI over USB.  The Pi is a 2B using a Pi 2.5A power
> supply.  The HDD has its own power supply, and apart from a keyboard
> and mouse, the only other item connected to the PI is a DHT22
> (thermometer)

In that case (taking into account that it works with your Ubuntu box) my
guess is that the Pi is not delivering enough power to the SSD.

>>https://www.suse.com/support/kb/doc/?id=7006510 is a starting point for
>>interpreting these messages.
>
> Thanks.  On the off chance that I'm reading that correctly, the
> initial error is "Medium not present", with no hints as to the later
> failure to mount etc.

That _is_ the hint. You can’t mount a disk without being able to
communicate with it.

--
https://www.greenend.org.uk/rjk/

--- SoupGate-Win32 v1.05