I have a 2.4Ghz Black Macbook and I feel like the 250GB I have is not enough. And I was wondering can I put a 500GB on it? ALSO can it be 7200rpm what are the limits? i keep googling and searching and i can't find a real straight answer. can I use this one? http://www.newegg.com/Product/Product.aspx?Item=N82E16822148374 OH also, once I get this new hard drive how do I reinstall the OS? Do I use the CDs that came with my machine? and do I need to format it? how do i do this? How do I format an external to work with my macbook? it would be nice if i could read/write on both mac and PC, but it isn't necessary. I've got an external for each computer. i was just wondering..