Precision T3400 - RAID 1

I have a T3400 with Vista Business installed on the primary hard drive. I already have 2 - 1TB drives (identical) that were setup in a T3400 running Windows 7, OS running on a seperate (3rd) drive. The question I have is, what will I need to install the 2 - 1TB drives configured in a RAID 1 (mirror)?

T3400 - Windows 7

Drive 1 - Windows 7 OS

Drive 2 - RAID 1 for storage

Drive 3 - RAID 1 for storage

T3400 - Windows Business

Drive 1 - Windows Business OS (already setup)

Drive 2 - 1TB drive for storage (data already on the drive)

Drive 3 - 1TB drive for storage (data already mirrored to Drive 2)

Hope this makes sense!