The TowerRAID TR4U+B is an 4-bay storage enclosure for high capacity storage needs. With a built-in ventilating protective screen front panel, both units utilize a cable-less backplane-design to support up to four hard drives. Connecting to the USB 3.0 slot for 5Gb/s performance, 4 hard drives can be accessed at the same time using a single USB 3.0 cable. Backwards compatible with USB 2.0, the TR4U+B provides expandable storage with ease. Hard drives are installed on easy access hard drive trays for simple insertion and removal. With support of the latest 3TB hard drives, the TR4U+B is capable of having a total of 16TB in a single tower. Hard drive cooling is provided by a large 3.15" cooling fan located on the back of the unit. Supported in PC, MAC and Linux, the TR4U+B is an ideal solution for your storage needs.