The SBAY5BKSAS/SATA Mobile Rack provides a simple, hot-swappable internal storage solution with support for up to five 3.5in SAS or SATA (SATA I/SATA II) hard drives. The SAS/SATA backplane can be mounted into a 4U server/4U rack mounted case, helping to increase internal space efficiency; to help keep installed drives running at optimal temperatures, the 5 drive backplane features two rear-mounted 60mm cooling fans & is constructed of aluminum & steel for maximum heat dissipation. The RAID compatible SAS/SATA backplane delivers data transfer rates of up to 3 Gbps to provide maximum performance for enhanced storage applications.