The chaps over at OCC take a look at the box of the FreeAgent Pro 1TB external hard drive which allows you to transfer the data from your computer to the FreeAgent Pro via three different and common ways: USB 2.0, FireWire 400, and eSATA. Here's an excerpt:

While comparing the Seagate FreeAgent Pro 1TB to the other Seagate FreeAgent models, it did do better in just about all of the different benchmarks that it was thrown up against. The only device that the Seagate FreeAgent Pro 1TB was unable to compete against was the internal hard drive, which is to be expected due to the fact that no matter how the device was attached to the computer, it had to run through some sort of bus. I was very surprised that it did as good as it did against the other drives, but at the same time I was not surprised. Like I mentioned before, I expected my internal hard drive to out-perform the FreeAgent drive, but I expected the FreeAgent Pro 1TB to come closer than it did against the other FreeAgent models. I can safely say that I would suggest getting this piece of hardware to expand the capacity of your setup due to the results that I got when testing it, as well as the added value of the backup software that is bundled with the drive.