Set udma to 6

Hi,

I have 1 tera black drive wd1002faex-00z3a0 and I see in hd turn that the udma mode 5 is activated , how I change that to udma 6 ?

I tried both to set in my motherboard setting to " auto" and to " udma6" the result was the same

please advise as I experince slow with my hard drive