A couple days ago I had a rough experience with Hitachi 7k500 500gb HDD - it made entire case of my Mac to vibrate. The noise levels were rather high as well. I have returned it. Which other 500gb hardrive in £40-60 range would you recommend? Which online retailer would be best, in case of a lemon? The issue here is that unusually high vibration levels may not be regarded as a fault per se and quite a few sellers do not offer returns on functional unpacked items. What is your experience with this?