I'm very wary of buying things for my MacBook without peer approval. Therefore allow me to ask a few questions. I have a "MacBook4,1" (via Apple -> About this Mac -> etc) and it has 2.4 GHz Core 2 Duo, 2 GB (upgraded to 4) and a 160GB HDD. I would like to upgrade this HDD to something closer to 500GB. Can I use any 2.5" drive to do this? Does anyone have any recommendations? Also, for my current 160GB HDD, can I buy a caddy for this to access via USB?