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what's the difference between 9 pin usb connector and the 20 pins?

Go to solution Solved by Skiiwee29,

9 pin is USB 2.0 and 20 pin is USB 3

9 pin is USB 2.0 and 20 pin is USB 3

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2 hours ago, Skiiwee29 said:

9 pin is USB 2.0 and 20 pin is USB 3

To expound - USB 3 is a superset of USB 2. It has the same wires as USB 2 plus some extras. 

 

Regular USB has 4 wires, regular USB 3.0 has 4+5=9 wires. 

 

The header connectors carry two USB hubs worth of data. I believe the extra pin/blank is there to help people figure out which way to plug in the connector.  USB 3.X staggers the pair of USB3 pins on the connectors (so not perfectly mirrored like USB2) presumably to reduce the effects of any electrical/RF interference. USB3 has tighter tolerances (they're moving 10x the data), so things like wire twisting pattern matter more. 

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