This doesn't even make sense. You,much like this other guy, don't seem to understand how voltage works.
Do you realize the power draw from a 2.5" hdd is miniscule compared the voltage throughput of the devices core function, which is docking and charging? You have a base ignorance of voltage or the USB technology in general.
Here, do us all a favor and do some actual research yourself...Google USB port burned out from 2.5" HDD. I'll wait. Hint, it doesn't exist..in fact, the results offer up countless results that directly contradict what you are saying, and the danger is in burning out a connected device, not the port. Which I've already stated, had you bothered to actually read.
Also, brush up on that grammar, in addition to your fact checking, if you ever expect someone to take you seriously.
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Ignore these guys. The real danger is frying the hdd itself, as Switch was never intended to have anything other than the dock connected to it, so who knows what kind of backfeed voltage is happening.
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So, you're admitting what you said was nonsense? Ok, then.