Some SATA cards do not actually manage raids, and in those cases, you can use Disk Utility to Mirror or Stripe your hard drives. In the case of more complex raid setups, like RAID 5 and 6 you’ll need a hardware controller.
That said, I read that the Atto R680 supports RAID 5, and I would recommend RAID 5 over RAID 0. RAID 5 only allows you to use the storage of 3 out of your 4 drives, but the upside is if one of those drives ever die, you just swap out the bad drive, it will rebuild itself and you’ll lose nothing. In the case of a RAID 0, if one drive dies you lose everything.
Richard Sanchez
Los Angeles, CA
“We are the facilitators of our own creative evolution.” – Bill Hicks