Can't find any advice on this except for one 'yes get the bigger buffer' but no reason given. I have a Powerbook and it's finally time to get a proper backup system in place rather than just dumping the iPhoto Library and Docs folders on the iPod every so often. The 10% off at the Apple Store tonight also seems like a good reason for doing it now. I'm thinking about a 200GB so that I can make a full back up of the PB and still have room for other stuff in the future (I plan on getting a camcorder in the next year but I doubt I'm going to turn into Spielberg with it) and with the slow drive in the PB, it would be useful to do it externally. I doubt I'll use it often over USB2 so I'm really looking at the Firewire 400/800 drives. The 'old' Lacie 400/800 is £30 cheaper than the Extreme one but has a 2MB as opposed to an 8MB buffer. What practical differences might I see between a 2MB and 8MB buffer? Am I likely to notice at all?