Introducing the ICYCube MB561U3S-4SB 4-Bay external 2.5" & 3.5" HDD enclosure with SuperSpeed USB 3.0 and eSATA interface. The MB561U3S-4SB is designed for those in need of large data storage with a small footprint and supreme build quality. The USB 3.0 interface allows you to access up to four drives at up to 5Gbps and is backward compatible with USB 2.0. The eSATA interface delivers fast SATA III speed, supports eSATA port-multiplier function and is compatible with most of RAID controller card with eSATA port-multiplier interface. The 4 bay capacities give you enough room to optimize your data storage system with efficiency. The ICYCube MB561U3S-4SB supports both 2.5" and 3.5" SATA SSD/HDD with our new EZ-Tray design, allowing you to mix your 2.5" and 3.5" HDD within a single enclosure to save desktop space, power consumption and cost. The detachable 80mm cooling fan provides excellent cooling to the drives, and the 3 speed fan switch gives you full control over noise and temperature. The built-in power supply removes any requirement for an overly large power brick which helps you save space. The ICYCube MB561U3S-4SB is a quad bay USB 3.0 enclosure with fully loaded functions and eye-catching design. It is perfect for media professionals, and people who need a high quality HDD enclosure for their storage needs.