okay so my hard drive is starting to fail, and i'm looking to replace it. i would ideally like to put in a wd scorpio black at 320gb. my question lies within my mbp. it's a 2009 13" model (after the june update), and it says my sata link speed is 3. does this mean i'm confined to any drive that supports sata 2, or can i increase the speed to use this sata 3 drive? if not i can just get the scorpio blue, but i would prefer to use the black. thanks for the help!