Drive bay: turn 2×5.25' drive bay to 3×3.5' hot-swap drive bay Interface: SATA to SAS,SAS to SAS Fan sensor: Fan failure sensor Alarm: overheating alarm Cooling system: 1×80mm ball baring fan with air duct providing excellent cooling air flow RAID: support RAID 0,1,5,6,10 functions( Raid card required) Power connector: 1×4-pin molex power connector Data connector: 3×SATA( I or II or III) /SAS data port