hi there, i have a 2nd gen macbook. currently with 120gb of HD space. i need/want more.. i was wondering, would any 2.5" HD work? does the rpm matter? i know the faster the better, but will my macbook support speeds of 7200rpm? and i know this may sound stupid but, can the macbook hold only up to 160gb of HD? or can i buy a larger HD than 160gb? ie. 250 or something? thank you soo much for your reply's.