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Q: When talking about USB speed, what is the difference between High Speed, Full Speed, and Low Speed?
A: The USB 1.1 protocol supports Full Speed (12 Mbit/s) and Low Speed (1.5 Mbit/s). Low Speed is generally for devices such as your keyboard and mouse. USB 1.1 audio devices (e.g. MobilePre, Fast Track USB) and and devices such as M-Audio USB Keyboard controllers (e.g. Axiom Series, Keystation) operate at Full Speed. The USB 2.0 protocol supports Low Speed, Full Speed, as well as High Speed (480 Mbit/s). Devices such as external USB 2.0 hard drives and certain M-Audio sound cards (Fast Track Ultra, Fast Track Ultra 8R) are High Speed USB 2.0 devices.
Devices that are "Full Speed USB 2.0" will operate at Full Speed (12 Mbit/s) on a USB 2.0 port. Such devices are generally backwards compatible with USB 1.1 ports.