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USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.

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Externally Powered USB Port

I have a Raspberry Pi and it requires a Externally Powered USB hub to run Portable HDD on it. … So what if I connect +5 and GND port of the USB Client to external power source of 5V-1A directly rather then connecting them to the USB Host ? …
Parth Parikh's user avatar