Sorry if this has already been posted I am a brand new user to these forms. The problem I am having is that i need to format my External 750 Gb WD Hdd to be read both by mac OS X and by vista. I also need the ability to save files of a size greater than the 3 gb that fat32 allows. Basically what I am doing is taking 10 and 12 gb files from my back and needing to transfer them to my pc. Thanks.