Drive Bays 4 x 3.5" hot-swap SAS/SATA SAS or enterprise SATA HDD only recommended
Backplane 1U 4-Port 12Gbps Backplane Support 4x3.5" SAS3/SATA3 HDD/SSD
Front Panel Buttons: - Power On/Off button - System Reset Button - Unit Identification (UID) button LEDs: - 2 Network Activity LEDs - Fan Fail/System Over Heat LED - HDD activity LED - Power Status LED - Unit Identification (UID) LED
Systems Cooling Fans: 4 x 40x56mm counter-rotation PWM fan(s)