USB 1.1, USB 2.0, and Firewire Comparison Chart:
Max. Burst Transfer Rate
| USB 1.1 | USB 2.0 | FireWire 1394a | FireWire 1394b |
| 12 Mb/s | 480 Mb/s | 400 Mb/s | 800 Mb/s |
USB 2.0 - Capacities
Maximum cable length (USB 2.0): 5 meters
Maximum cable length (USB 1.1): 3 meters
Maximum hubs connected in series: 5
Maximum devices connected in series: 127
The Universal Serial Bus (USB) interface connects computers to mice, digital cameras, scanners, printers, handhelds, and other peripherals.
USB 2.0, available on desktop computers and on laptops, raises the data-transfer speed from 12 Mbps to 480 Mbps and brings the technology to the most demanding peripherals, such as camcorders, portable CD-RW drives, or external hard drives.
Most new mainstream PCs have at least one USB 2.0 port, which lets you connect not only dozens of new USB 2.0 devices but also the thousands of USB 1.1 devices on the market. Connecting a USB 1.1 device to a USB 2.0 port, however, will still yield a maximum througHPut of only 12 Mbps."
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