Asrock z77 extreme 4 how to Connect HDD in sata 3 6GB/s

I just bought a Asrock z77 extreme 4, and tried installing new OS win 7 64 bit.

But i coulnt boot into DVD drive for couple of times, the pluged that into sata2 port.
Then when about to select a partition for win installtion windows say "Installation cannot proceed with the Disk 0 partition. bla bla bla and check bios"

So after some checking i changed the sata mode to IDE in bios from AHCI mode,

every thing went fine and installed the OS.

Then i was curios if my sata HDD is running in 6 Gb/s.

So i came across a tutorial and followed it, change a registry value and then in bios change sata to AHCI mode.

Now when i check , i could see in that intel software that my HDD runs in 3 GB/s.

Pls suggest me how to change mine to 6 GB/S. and why it didnt recognize the HDD in first place ?
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