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Don't just look at sdb hits in the log. Open up that entire session in journalctl kernel mode (
journalctl -k -bN
where N is the session number in session history) and find the context surrounding the drive dropping and reconnecting.You'll probably find that something caused a USB bus reset or a similar event before the drive dropped and reconnected. if you find nothing like that try switching power supplies for the HDD and/or switching USB ports until you can move the drive to a different USB root port. Use
lsusb -t
and swap ports until the drive is attached beneath a different root port. You might have a neighboring USB device attached to the bus that's causing issues for other devices attached to the same root port (it happens, USB devices or drivers sometimes behave badly.)Always look at the context of the event when you're troubleshooting a failure like this, don't just drill down on the device messages. Most of the time the real cause of the issue preceded the symptom by a bit of time.
Very good answer. I've also spent some time analyzing some red herrings when it was something else like a bad cable or connector. And by the way, you can use the same keys in
journalctl
as in the usual pager (less(?)) so hit/
and search for 'unmount', 'disconnect', etc. And then scroll through the log and find out what led to the situation.