8x 3.5'/ 2.5' SAS3/SATA3 Backplane for Hot-Swappable Drives Front HDD Door Lock & Side Panel Intrusion Switch Front I/O Ports: 2x USB 3.0 3x Middle 8cm (9400 rpm) PWM Fans & 2x 8cm (9400 rpm) PWM Fans 4U / Full Tower Chassis Supports max. Motherboard, Sizes - E-ATX 13.68' x 13'/ATX/Micro ATX 1230W (1 + 1) Redundant Titanium Level Certified High-Efficiency Power Supply 3x 5.25' External HDD Drive Bays & 8x 3.5'/2.5' Hot-Swappable HDD Drives