Built-in hardware RAID controller allows four different configurations: RAID 0 (FAST), RAID 1 (SAFE), JBOD, & BIG. Supports SATA 6Gbps and hot swap. Removable tray system for easy maintenance. Front LED indicator lights for drive power, access, fail and RAID 1 rebuilds status. Full metal construction, perfect for rugged applications and complies with flammability requirements. Fits 2 x 7mm to 9.5mm 2.5' SATA HDD or SSD in a 3.5' external bay.