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#21
USB 2.0 has a 480 M bits per second transfer rate, or 60 M Bytes per second transfer rate. I'm confident to say that the transfer rates you're going to achieve aren't related to the USB port but to the media you're using. I have a HDD USB 3.0 dock with a SATA HDD. It begins with 220 b/s transfer rate (to disk ram cache) and slows down and stabilize at 35 b/s. The results are the same if I use USB 2.0 or USB 3.0 port. The bottle neck isn't the USB. The The bottle neck is the device (SATA HDD).
As Z3r10 mentioned on post #15, It doesn't matter if you connect your external HDD to USB 2.0, 3.0, or 3.1.
USB 2.0 has a 480 M bits per second transfer rate
USB 3.0 has a 5 G bits per second transfer rate
USB 3.1 has a 10 G bits per second transfer rate
I would say that your external HDD won't achieve 300 M bits per second transfer rate.
So the results will be the same if you use USB 2.0, 3.0 or USB 3.1 port. The bottle neck isn't the USB. The The bottle neck is the device (SATA HDD).