Hello, On my old Macbook Pro, I had my HDD upgraded at a local authorized Apple service dealer and they really botched my computer up. The fibers in the SuperDrive were terrible cut up, and there were gaps between the upper and lower casing. They ultimately fixed it a little bit but it was still not as good as the factory job. Another complaint I had was that the HDD was noticeably louder and I could feel it click and move on my left palm. Do you think this was due to the reason that an OEM HDD does not come with the HDD noise dampener the factory ones do? Any suggestions on what I should do or buy (if I prefer a quiet drive that I won't feel the click on) and where I should get it done (Will Best Buy do an equally poor job)? I am looking to get at least 320 GB 5400 RPM HDD (but will probably end up getting a 500 GB because they are not much more expensive). Also, if someone could comment if the battery life of my current HDD compared to these newer ones, that would be great. I currently am using a MBP 15.4" SR 2.2 GHz 120 GB 5400 RPM Stock Fujitsu MHY2120BH with 4GB RAM 128MB GeFore 8600M GT. Your help is greatly appreciated, thanks!