Norco External 4U 24 Bay SAS/SATA Expander JBOD Enclosure DS-24E 24x hot-swappable SATA II, III/SAS 6G drive bays Built in 6Gb/s SAS Expander for single SFF-8088 cable connectivity, LSISAS2x36/28 expander IC embedded. System status indication through LCD, LED (Link status and Activity) and alarm buzzer. Backplanes are horizontal mounted for better ventilation RoHS Compliant, OS Independent, Come with full range ATX power supply, , also support optional mini redundant power supply