RocketU Dual USB 3.0 for Mac: The Industrys First PCI-E Gen 2 x1 USB 3.0 RAID HBA for the Apple Mac Pro and OS X Operating system. The RocketU Dual USB 3.0 for Mac is a low-cost, PCI-E 2.0 HBA that delivers 5Gb/s performance, and is ideal for a variety of external storage configurations. The RocketU Dual USB 3.0 for Mac supports RAID 0, 1, and JBOD configurations. Features: 2 USB 3.0 Type-A ports. 5Gb/s Transfer Bandwidth. PCI-Express Gen 2 x1. Supports up to 2 external USB HDD/SSD. Optimized for external USB SSD's, hard drives and drive enclosures. Hot-Swap and Hot-Plug. Supports RAID 0, 1, and JBOD. Supports OS X 10.5 and later. Backwards compatible with USB 2.0 & 1.1 external drives and enclosures