One of the things i always wanted to try (and it seems many of you wanted that as well judging by the many emails i received when i first mentioned this) was to test the same exact hard disk drive with both SATA II and SATA III connectivity to see if there were any real gains at all between both models. Of course as you all know it's not very easy to come across two versions (SATA II/III) of the same exact HDD so it was pure luck when i stumbled on the SATA II version of the latest Ultrastar 7K4000 4TB enterprise class HDD from Hitachi GST (HGST now) roughly one month ago. Back then however i didn't have the SATA III version in my hands so this comparison was left unfinished until i did and that time has come.



Link: Nikktech