If I plug my seagate ST31000524AS(which is SATA 3) to a sata 2 port(have only two sata 3 ports on my MB) I heard that there will be no performance degrade as the hdd is slow and sata 2 is way faster that what the hdd can perform. Is that true?
Edit:I'll be using it to store data like movies, music etc.
HDDs can be SATA 3 (6Gb/s) "compatible", not SATA 3 (6Gb/s) "capable".
No HDD can spin fast enough to achieve 6Gb/s speeds. The ST31000524AS has a 32MB cache buffer that can transfer its contents at 6Gb/s speeds, but that's it.