Just for the sake of information, the IDE drives that came with the 5300's were the, 17mm "fatter" 2.5"ers. You can easily stick in a larger capacity 15mm with a bit' o' foam, etc.- that won't cause heat issues, under it, and it works very well. It also seemed that Apple did their best to use the slowest benchmark drives they could in Powerbooks.. why was that?? I couldn't stand the 750mb IBM donkey-cart that my 5300c originally had..