A lot is being said about the Firewire. The first thing is its acceptability on the market. In fact, that is not a polemic point, due to the fact that its creation has practically happened by industry order", mainly the appliances and great performance computers. However, when we mention the question of the use of Firewire in PCs, we remember the example of the USB (Universal Serial Bus), that has taken some years until it was consolidated. Even today, the availability of USB peripherals is not so wide, what makes us conclude that there still is a great resistance against the elimination of standard peripherals and boards to connections in slots. Besides that, in most recent revision, the USB shows very attractive performance characteristics, if compared to the Firewire, what gives advantage to the USB, for longer offered. But we should not shut our eyes to the great innovation that came along with the IEEE 1394 specification.