The X2-U3 2-Bay USB 3.0 Disk Enclosure from HornetTek fits up to two 3.5" SATA I or II hard drives and provides them with a speedy and convenient USB Type-A interface, which adheres to the USB 3.0 standard for data transfer rates of up to 5 Gb/s. The X2-U3 only supports JBOD mode so you'll have access to a larger storage capacity. Its aluminum enclosure keeps the drives cool while a built-in 5 cm fan provides extra heat dissipation. LED indicators on the enclosure will notify you of the device's status as well as drive activity with just a quick glance.