Chenbro RM23524E2-L 2U Rack Mount Server Chassis with 24-Bays HDD Cage, 6Gb/S Mini-SAS and Expander Backplane Case Type: 2U Rack mount Material: 1.2mm SGCC M/B Type: EEB (12 x 13 inch) Processor Support: Intel / AMD DP Quad Drive Bays: 24x 3.5'' Hot-Swap HDD Trays Expansion Slots: 7 Low Profile Backplane: 6Gb/s Mini-SAS w/ Expander Cooling System: 3x 80mm PWM Hot-Swap Middle Fans