Okay, I'm getting really confused with the crossed signals. Let me try to phrase my question in the cleanest way possible

Is it possible to have a single drive for the OS, then two drives on a RAID 1, and all of these running off of the onboard RAID controller?

Plus, there's another issue. If I did go with onboard RAID, I don't know how I would configure all the drives physically. At the moment I have 2 CD drives and 2 hard disks. That's four. Where do you get cables that support more than 2 devices? (preferably long, rounded, silver ones )