Difference Between USB 20. and USB 3.0

Characteristic	USB 2.0	USB 3.0
Released in	April 2000	November 2008
Signaling Rate	480Mbps.	5Gbps
Port Support	USB 1.0, 2.0	USB 2.0, 3.0
Max. Cable Length	Up to 5 Mtrs.	Not Specified
Unit Load	100 mA, A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0	150 mA, A device may draw a maximum of 6 unit loads (900 mA) from a port in USB 3.0
No. of Wires	4,5	Double than USB 2.X
Signaling Method	It does not support concurrent read and write operation.	It supports concurrent read and write operation.
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