SAS builds on parallel SCSI by providing higher performance, improving data availability, and simplifying system design. The SAS interface supports both SAS disk drives for data-intensive applications and Serial ATA (SATA) drives for low-cost bulk storage of reference data. The ARC-12x3-4i/-8i support directly attach 4/8 SAS ports via 1/2 internal SFF-8087 connector. The ARC-12x3-4i/8i RAID controllers are low-profile PCIe cards, ideal for 1U and 2U rack-mount systems without needing the expansion capability. These controllers utilize the same RAID kernel that has been field-proven in existing external RAID controller products, allowing Areca to quickly bring stable and reliable RAID controllers to the market.