Syba SY-ENC50104 is a 4 Bay Enclosure for 3.5' SATA I / II / III hard disk drives. It supports 4 HDD of different brands and a capacity of up to 8TB per drive. Note: The Motherboard's SATA port MUST support Port Multiplier in order for your computer to recognize multiple hard drives if the unit is connected via eSATA. Dual eSATA and USB 3.0 external interface enable a blistering fast data transfer speed of up to 6Gbps and 5Gbps respectively.