I need to find out what kind of system requirements and hardware requirements needs for seagate barracuda hard drive.. i wan to know the compatable RAM for that hard drive
Your RAM and hard drive have nothing to do with each other. You just need a motherboard with a SATA connection, so pretty much any motherboard made in this millenium.
You may use a HDD without worrying about the RAM. Here you may check the specs on the BarraCuda drive if need be and if you have any questions, ask away.