Mediasonic HF2-SU3S2 Pro Box is a 4 Bay Enclosure for 3.5" SATA I / II / III hard disk drive. It supports 4 hdd of different brand and capacity up to 3TB per drive. Note: Motherboard's SATA port MUST support Port Multiplier in order for your computer to recognize multiple hard drive if the unit is connected via eSATA.