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I began researching this after I was unable to copy a large number of files from one external USB drive to another using my new MacBook Pro. The problem might be with external hard drives connected via Thunderbolt 3’s USB-C ports, which is, of course, the only way to connect them.
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If you’re using or considering buying one of the new MacBook Pro models with the Touch Bar (see “ New MacBook Pros Add Context-sensitive Touch Bar,” 27 October 2016), be aware that some people are seeing their machines shut down repeatedly and unexpectedly. Some 2016 MacBook Pros Suffering USB Drive Problems
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