They are all IDE drives with a special FireWire bridge board. One of the limitations is the drive themselves. So even if you had that drive on a 400Mps interface, the drive would be the bottleneck. So you see, until the drives can go faster or you use an array of striped drives, FireWire offers no real speed advantage. But FireWire drives ARE hot-swappable and easily packaged as external drives.
Sustained Rate is displayed in the charts.
Peak rates can be impressive but do not reflect typical drive performance.