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I have Ubuntu 16.04 running on a Windows 10 host in VirtualBox. I'm trying to rsync a large folder (192GB) onto an external USB hard drive enclosure (Orico USB 3.0 2.5 SATA III) containing a Samsung 830 SSD (240GB). The disk is formatted as NTFS, and I have ntfs-3g installed on Ubuntu.

The operation starts out fine, but at some point the rsync fails and the USB seems to have unmounted:

rsync output:

rsync: rename "/mnt/usb/bitcoin/blocks/.blk00201.dat.vptzQx" -> "blocks/blk00201.dat": Input/output error (5)
rsync: mkstemp "/mnt/usb/bitcoin/blocks/.blk00202.dat.QAivPb" failed: Input/output error (5)
rsync: mkstemp "/mnt/usb/bitcoin/blocks/.blk00203.dat.XoflbV" failed: Input/output error (5)
...

I can see in VirtualBox that the USB drive has been unmounted:

usb unmounted

I'm not sure which logs I can check to see why it's unmounting. Suggestions?

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