USB is slow for data transfer, but helps with being portable to other machines.
Firewire is fast for data transfer, but not all machines have firewire.
With the introduction of 1Tb drives, the 640Gb drive have recently dropped in price to the 500Gb retail listing. This is very attractive now since the 500Gb drives are dropping in price too.
So, what to do? Get a USB dealing with the longer transfer time of backing up photos, audio (conference recordings), and computer driver and SP's or go firewire for speed or have an external drive that does both?
The drive that does both port standards of course costs more money.

Then there are ones that do USB/Firewire/eSATA !!! $$$
Hmmm. Newegg better have some sales soon on this before I either loose data or loose $$$ buying something.
