Hi, I'm looking to purchase an external hard drive in the coming days. Looking for one with between 500mb and 1TB. I've had a look on the Apple site and a lot of them show they are compatible with Mac OS 10.5 & 10.6 but no mention of 10.7? Has anyone got and using a hard drive that fits my description? Would you recommend it? It's going to be purely for Time Machine, so I'm looking to just plug it in and not have to worry about it again.