I posted this in the "Macbook/iBook" section, since technically I don't have a "Pro"... But since it's still an aluminum unibody, I figured I would post it over here too. This should also clear up any discrepancies about the taller 12.5mm HDDs (they fit in all Aluminum Unibody Macbooks/Pros). I should also add that this drive is SILENT; doesn't make a peep! It also doesn't make any vibration whatsoever. I used to be able to feel a slight vibration on my left palm (w/ the 500GB drive), now I can't feel a thing. HDD Specs: Western Digital WD10TPVT, 1TB, 5200 RPM, 8MB cache, 12.5mm height The 1TB drive in all it's glory 9.5mm vs. 12.5mm For those that said it couldn't be done... Restoring from a Time Machine backup is amazing, I literally can't even tell I have a new HDD (other than the capacity increase). Everything is exactly the way it was on the old HDD. Xbench test: EDIT: The following 8 posts are about this HDD, which I found out will not work. (Mods merged two threads and it go a little confusing).