I had a 2009 MBP and it came with the Hitachi Travelstar in 160GB, 5400RPM. This drive is SUPER QUIET. When I upgraded to the 2010 MBP, I took the stock 320GB out and put the 160GB in due to noise issues. I recently purchased the 320GB model of the Hitachi Travelstar, hoping it would be just as quiet as its 160GB equivalent. It is a bit noisy and not as super quiet as my 160GB drive. Can anyone please recommend a super quiet and sturdy 320GB 5400RPM drive that I can use in my MBP? Thanks!