I have a new 2012 macbook pro and need to add a large 7200rpm drive, and I'm wondering if it would be more cost effective and/or best to remove the optical drive and replace it with an HD, or build my own USB 3 portable external drive? This drive will be used for music creation, so it needs to have fast random read/write and have plenty of storage (I have over 500GB of samples/audio files that I use daily, more that get occasional use that I would like to have available). I tried using a 1.5tb Seagate USB3 portable drive and it couldn't keep up (guessing its a 5200rpm drive inside) while the 3TB Seagate USB3 (that needs an external power supply) is getting acceptable results. However, I dont like having to bring something that needs an extra power supply... The catch is I do still need to burn audio CD's, so either I get an external HD, or I get an external burner. Given the cost vs performance, which way would you go? Would switching the optical drive with a 7200rpm drive void my applecare? Would it cause too much heat and should be avoided? Any good portable external HD's that actually use 7200rpm drives? Thanks!