Well, actually i've bought without noticing it was a Sata 3. It's the so called "i'm in a hasty". Now, if it's better than sata 2, i just can't tell. Perhaps, i say perhaps because i've never tried it personally, if a body got a mobo compatible with sata 3 it may increase its performance. There's was a guy that made the test and posted in you tube, if my mind doesn't trick me. As far as i could see it only increased the speed around 30 or 40 seconds comparing to a sata 2 HDD.
I have some others 1tb and 2tb capacity drivers
and i don't remember having received the same display message when i formatted them.