The HDD in my macbook is starting to make grinding noises when the laptop is sitting on the table - when held at an angle it seems to stop which is making me think that it's on the way out. I'm going to buy a new one tonight, and think I know the one I'm after. The WD Scorpio Black 320GB at £65 Not many places seem to stock it anymore, is there any reason for this? A little wary that they're phasing them out for a specific reason, or is it just that they're very popular? I can get the Scorpio Blue 500GB for £5 cheaper, but not sure how much faster 7200rpm is in read/write than 5400rpm and whether it's worth the extra for the speed. Any ideas?