Up to five 2.5" SATA hard drives:
250GB, 500GB or 1TB SATA 3.0Gbit/s 7200 RPM
Up to six 2.5” SAS hard drives:
600GB or 900GB SAS 10k RPM
146GB SAS 15k RPM
Integrated SATA 3.0GB/s controller that supports host-based (software) RAID 0, 1, 5, 10 (Windows only)
Optional SAS 6ir PCIe controller card that supports host-based (software) RAID 0, 1
Optional SATA / SAS Perc 6i PCIe controller card that supports hardware RAID 0, 1, 5, 10