Originally Posted by FastMHz
I bet the issue is power. That port in the case may not have adequate wiring to handle the current of an external HDD without a power brick. Try a powered USB3 hub and I bet it works fine
Good guess but based on the resolution, it doesn't make sense. Why?
I have the NEW 2TB drive (with no external power brick) plugged into the "old bad" port
I have the OLD 1.5TB drive (also with no external power brick) plugged into the good port
and 1.5TB drive is right now copying all files to the 2TB drive with no problems. Again, they are both connected to the two front USB 3.0 ports on my HAF X case, and those two ports are connected via direct motherboard connection to my ASUS Maximus VI Hero.