Hi, I own a June 2009 13.3 inch 2.26 ghz 2G RAM Unibody Macbook Pro. It came stock with a 160 GB 5400 RPM hard drive. Recently, I purchased a Western Digital 500 GB Scorpio Black 7200 RPM Hard Drive (without the sudden motion sensor - WD5000BEKT). I also have 8 gigs of RAM coming in next week that I will install. I installed the hard drive with no problem and have experienced greater performance, no clicking nor vibration, and no freezeup or rainbow wheel. I also did a clean install of Snow Leopard. I did a PRAM reset at the beginning and calibrated my battery. However, now I noticed my battery is draining FAST, only lasting 2 hours. I looked a little online and discovered I may still need to reset the SMC (shift-control-option + power key), which I will do shortly. The battery lasted 6-7 hours before with my old hdd and is at 96% capacity. If that does not fix the problem, is there anything else I can do? Thanks.