HighPoint RocketU 1144CM 4 Port Dedicated 5 Gb/s USB 3.0 PCI Express 2.0 x4 RAID HBA for Mac (Support Mac OS X 10.8 Mountain Lion) Four USB 3.0 ports with Type-A connectors for easy data access Supports RAID 0, 1, JBOD Super speed USB 3.0: 5 Gbps per USB port 20 Gbps transfer bandwidth Optimized for external USB drives and Drive enclosures Super Speed USB 3.0: 5 Gb/s per USB port (Up to 20Gb/s) PCIe 2.0 x4 Host Interface Four USB 3.0 ports with Type-A connectors for easy data access Supports RAID 0, 1 and JBOD Supports OS x 10.8, 10.7 & 10.6 Compliant with xHCI (Extensible Host Controller Interface) Specification Supports up to 4 external USB 3.0 HDD/SSD drives or enclosures Backwards compatible with USB 2.0 & 1.1 storage devices