![]() What typically happens in that case is just about exactly what you describe. But no matter what cable you use, the do NOT get enough power from a USB2 port to operate properly. ![]() So, these USB3 units DO work just fine when plugged into a USB3 port using a USB3 cable. ![]() Almost all Laptop Hard Drives require more than 0.5 amps, but not more than 0.9. Now, the 5 VDC supply of power from a USB2 port is limited to 0.5 amps max, but USB3 increased that limit to 0.9 amps. The WD My Passport unit is sold as a USB3 external drive, said also to be "compatible with USB2". I would bet the issue IS power, and it has nothing to do with plugging the LAPTOP into the wall, or odd USB ports.
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