Check out these videos from Pox, Ragable and Couchguy (Too Smart Guys) show us how to build and install a FreeNAS 8 Box, discuss the advantages of Redundant Array of Independent Disks. RAID 1,2,3,4,5,6,1+0 and 0+1.
Paul is a Network Architect, avid Tech Blogger, IS Major and new user of FreeNAS. He wrote the following Do-it-Yourself article on his website on how to build a FreeNAS box for around $500.