1 transfers data at the
rate of 12 Mbps (megabits per second), and USB 2.0 is rated at up to 480 Mbps. USB 1.1 has passed
into the great beyond with the advent of 2.0, but the two versions are compatible with one another,
so if you have an older, USB 1.1 device, it will work with your new Mac, which only uses USB 2.0.
The two main types of USB connectors are Type A (see Figure 19-1) and Type B (see
Figure 19-2). Cameras and some other devices often use a third type of USB connector called micro.
CHAPTER 19: It??™s Alive! Adding Hardware to Your Mac(enstein) 413
FireWire
The topology used by FireWire devices, called peer-to-peer, is optimum for transferring large
amounts of data at a very fast rate. This makes FireWire the optimal way to transfer video in real
time. Since FireWire is peer-to-peer, two FireWire devices can connect to each other without the
aid of a computer.
Like USB, FireWire comes in two flavors: incredifast and superbad-incredifast, or FireWire
400 and FireWire 800, respectively. Data transfer speed is 400 Mbps for FireWire 400 and, you
guessed it, 800 Mbps for FireWire.
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