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usb3 ext hd is feeding power into comuter through usb3 cable

Last response: in Storage
March 30, 2014 6:11:09 AM

Shouldn't the usb3 device block out power going out of it's power supply?
a b ) Power supply
a c 243 G Storage
March 30, 2014 7:10:59 AM

If the external hard drive runs from mains power, the USB cable carries only data to/from the host PC.
It cannot send power to the host PC, and even if it did, how do you know that's occurring?
March 30, 2014 7:46:07 AM

thanks for your reply. the external hard drive has its own wall wart power supply. when you shut down the computer the lights on the front of the compute,r including the light on the computer power switch, remain lighted. If you unplug the external hard drive power supply the lights go out. Which tells me that the external power is being allowed into the usb3 cable.