![]() ![]() However, the spin-up current was in excess of 2 (!) Amps for a good portion of a second, which would cause port overcurrent and failure to connect. ![]() I have seen older drives that would normally consume 700-800mA during intensive RW operation, so USB3.0 ports should be fine. Mechanical drives have a spin-up current which can significantly exceed the USB port power capability. The hard drive of 3TB size is definitely not a SSD. You can do some experiments with your hub by momentarily shorting VBUS to GND (red wire with black wire in USB cable with, say, 5-Ohm resistor, to determine the port capability. Some hubs have built-in power switches with certain pre-set limits (which are subject to manufacturing variations), some have no control or protection other that "resettable polyfuses" that may have marginal threshold. ![]() What is the power capability of ports on your hub. ![]()
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