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What is the speed difference between USB 1 and USB 2?

When I plug USB 2 devices into a USB 1 port Windows alerts me to the fact that I am not utilising the maximum speed possible. Could someone tell me the data transfer speeds of USB 1 and USB 2 standards?
Alan Vince, January 2005
USB 1.0 has a max of 1.5 Mbps
USB 1.1 has a max of 12 Mbps
USB 2 has a max of 480 Mbps

Graham, February 2005