I have no idea which kernel versions Ubuntu uses in its releases, but
the recurring Hardware Error bug should be fixed in the 4.14 kernel.  At
least I think it should -- nobody has reported on whether the fix
actually works, so I have no way of knowing.

As for the drive spontaneously waking up...  You may not be aware of
this, but the kernel periodically probes for drive events, even when no
user process is accessing the drive.  You can control the probe
frequency by writing to the /sys/block/sd?/events_poll_msecs file (fill
in the ? with the drive letter).  -1 means to use the system default
probing interval and 0 means to disable polling entirely.

Now, I'm not saying that the kernel polling is what is waking up your
drive.  But it is something you need to know about.

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https://bugs.launchpad.net/bugs/1733068

Title:
  Unmounted USB drives wake up on 16.04

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