we all know performance leaves a lot to be desired
it’s not used for video editing
it’s system resouce intensive
finally found a good explaination on the AcomData site
Q: What’s faster, USB 2.0 or FireWire?
A: As with so many questions about technology, the answer to that question is not a simple one. USB 2.0 and FireWire are very similar in many respects, but there are definite differences.
At first glance it would appear that USB 2.0 (480 Mbps) is indeed faster than FireWire (400 Mbps). However, this is only true under ideal conditions. While 480 Mbps is the maximum speed achievable, USB 2.0 cannot guarantee a specified data transfer rate. This is mainly because USB 2.0 is a master-slave, host-dependent technology, meaning it relies on your computer’s CPU to facilitate and manage data transfers.
FireWire (IEEE 1394x), on the other hand, is a peer-to-peer technology that does not require CPU resources to facilitate data transfers between FireWire devices. Moreover, FireWire devices can guarantee real-time delivery of data at a specific rate. Real time data delivery is necessary for certain applications, such as digital video streaming where dropped or delayed data packets is unacceptable. This is why devices like digital camcorders have 1394 interfaces, and why FireWire is the interface of choice for digital video editing applications.
For day-to-day hard drive use, USB 2.0 and FireWire will have comparable performance though FireWire will probably have a slight performance edge, which can make a difference if you are performing tasks that require large, frequent data transfers.