what does USB really do
While the two serial buses seem similar, they are intended to fulfill different market and cost needs. 1394 has the potential to move more data in a given amount of time, but is considerably more expensive than USB due to its more complex protocol and signaling rate. Applications that are best suited for 1394 are high quality consumer or professional video streams and other high bandwidth entertainment applications; all higher end consumer devices. USB is appropriate for high and low bandwidth computer peripherals such as mass storage,video, audio, scanners, printers, keyboards, and just about any peripheral.
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