dAGE412U20-ES is an external 4U-12 bay hot-swappable SATA rackmount disk array storage chassis. It provides users a most big storage capacity for up to 12 SATA drives for 1/0/5/JBOD RAID configuration. This 4U-12 Bay external SATA JBOD is designed with 12 eSATA connectors. One 120mm Ball bearing fan offer long lasting and enhanced thermal cooling solution. dAGE412U20-ES provides maximum storage and performance to high density storage system.