I'm trying to help out my parents from 500 miles away to backup their photo collection from their Mac Mini. I want to order them an external hard drive and have it as simple as possible, i.e. one that they just connect over USB and it shows up as a drive to copy onto... Most of them seem to say they need Mac OS 10.4, my parents only have 10.3. Is this 10.4 requirement likely to be for their custom software? So if i order something like this: http://www.amazon.co.uk/gp/product/...&pf_rd_t=101&pf_rd_p=467198433&pf_rd_i=468294 ...and they connect it to the Mini will it actually show up as a writable drive even though they only have 10.3? They're currently backing up some of it to CD but it's a huge library... Thanks a lot.