I did a tiny bit of math, and it looks like the tangential velocity (rim speed) of the 7200 RPM 3.5" drive (79170 in/sec) would actually be slightly faster than the 2.5" drive (78540 in/sec), so I would expect that a 300GB short stroked 1TB drive might be slightly faster than the 2.5" drive in data transfer (assuming the same bit density