So,i must buy new hdd to my computer... My mobo is Asrock K7NF2-raid.I want ask:can i use sata 2 hdd with this mobo??? (there is two sata connectors onboard)

http://www.asrock.com/mb/overview.asp?Model=K7NF2-RAID

- 2 x SeialATA 1.5Gb/s connectors (supports RAID,0,1,JBOD)

You would need to "jumper down" SATA II drives to SATA I (1.5Gb/s).

There is a jumper on SATA drives in order to do this.