Summary: I bought this thinking it had a 800 firewire connection and it only came with usb 2 and esata. I need to have fast transfer speed so the usb 2 isn't an option for me and I ended up spending another £30 to get a esata expresscard for my mac laptop. If you have a newer mac you won't be able to do this as they don't come with a express card slot anymore. It functions fine as a drive though.
Summary: This drive needs to be plugged in to the mains to work. I read many of the reviews to try and determine what I found out the hard way and couldn't decide one way or the other so hopefully I'll save someone else the trouble. I needed a cheap, bus powered, high capacity drive. The drive would be used for time machine back ups but needed portability also, speed wasn't an issue, power source was.