So, received my new hard drive yesterday and got it all setup in my new Mac Mini. I will say, the difference from a 500GB 7200 rpm drive (Apple stock Hitachi) vs this new Samsung 5200 rpm (9.5mm form factor) is very negligible. In a disk test I found the following results: 1GB File Hitachi 500GB 7200 RPM: Write - 87.0 Read - 97.8 Geekbench - 6604 1GB File Samsung 1TB 5200RPM: Write - 94.8 Read - 82.5 Geekbench - 6616 In just a nights time, I see very little relative slowdown. There is some however.....I have a 140GB Aperture library which takes a little longer to load up, but not so long that I would want to switch back to the 7200 drive. I do have a Western Digital Scorpio Blue 1TB on its way to add as the second hard drive as soon as my data cable comes in for the bottom drive to give me 2 TB total, I am using this mainly as a media server, but do a bunch of photoshop/aperture work on it. While these are no SSD's its respectable enough, plus I have a MBA for typical everyday use..... Hope this helps somewhat everyone thinking about these drives. Mac Mini Specs: 2.5 i5, 8GB Crucial Ram, Samsung Pinpoint M8 1TB Drive.