RAID question...plz help

So I got 4 hard drives total: 1x 74gb raptor for my operating system, then I got 2 x 320gb seagates and 1 500gb seagate... my question is can I setup RAID 1 on my 3 seagate drives? leaving raptor by itself ? I just want all 3 seagate hard drives to have exact same copy of my data on every drive, tell me if I can do it with RAID 1 or what else I need ?

I believe you can do RAID 1 with your three Seagate drives, however, it would be pointless. Having two 320gb drives in RAID with a 500gb drive would limit the storage space of the 500gb drive to 320gb, so you are losing 180gb of storage space. My recommendation would be to run the two 320gb drives in RAID 1, and use the 500gb independently (not in RAID).