In a few cases it even seems to work OK, but that can be a risky situation. The unit appears to be working and spins up, but then it generates so many errors and read failures that the OS cannot recognize it. 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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