On Wed, Jul 27, 2016 at 12:08:56PM -0400, Michael Galea via talk wrote:
> PS: A few years ago I noticed an interesting behaviour in Linux.  When
> rsyncing hundreds of GB from the eSata to the USB mounted drive I found the
> file system to become unreliable and unmountable.  A workaround that I now
> follow is to add an "--bwlimit=15000" in the rsync command, which ensures
> that the eSata doesn't get too far ahead of the USB drive. May be completely
> unnecessary now..

That's because USB gets disconnected and reconnected.  So, /dev/sdc
becomes /dev/sdd in the middle of copying.