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My external hard drive is connected to a powered usb hub (5v 3000mA) then connected to rpi3. Whenever I copy any file that would take more than 30 sec, it would unmount and I have to mount the next letter (/dev/sd[letter]1).

Any suggestions on how to fix this? Would attaching another adapter to the hub, via usb, increase its output?

  • I would definitely recommend verifying power, including the quality of the cables used to connect devices. A robust power supply fed to your devices over a poor cable will cause failures. Check for errors in your logs that might give some indication of the cause. – bobstro Jan 19 '18 at 19:29
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Sounds a lot like a power state issues. Verify powers to the HDD. It may be a good time to evaluate all power connections

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