The SAS 5/iR PCI Express RAID adapter from Dell is used to connect internal hard drives in PowerEdge servers. SAS 5/iR utilizes high performance SAS 3Gbps technology to connect to the hard drives, and the latest generation of host interface technology, PCI Express (PCI-E). The SAS 5/iR supports only internal disks and provides integrated capability for RAID levels 0 and 1.