DAGE412U40DE-ES is an external 4U-12 bay hot-swappable SAS/SATA rackmount disk array storage chassis. It provides users a most big storage capacity for up to 12 hard drive drives for 1/0/5/JBOD RAID configuration. This 4U-12 Bay external SAS/SATA JBOD is designed with 12 eSATA connectors. One 120mm Ball bearing fan offer long lasting and enhanced thermal cooling solution. DAGE412U40DE-ES provides maximum storage and performance to high density storage system.