i recently got a 13" mbp, upgraded to a WD scorpio blue 500gb and 4gb crucial RAM. the annoying thing is that the WD HDD seems to always be spinning (randomly at different rates, never silent). i feel that this is not only draining the battery, but it is also slightly obnoxious. is there any way to get the thing to stop spinning, or is that just what it does. I feel as though my past macbooks havent had this problem. thanks.