Recently upgraded ram (fr 4gb) and hdd (fr 250gb) and have had constant periodical spinning wheel (every few mins) a few months since. Reverting to old ram is no help - figure its not ram. Guessing hdd is too big (9.5mm 5400 wd Scorpio blue). Resigned to replacing it unless any suggestions otherwise? If I do replace would a 750gb 7200rpm make a big difference? Any suggestions on largest hdd that might retain speed and battery life? Not up for ssd yet $ wise. Seems the seagate xt 50% ssd's run hot and burn battery - or am I wrong there? Thanks in advance for any assistance.