The RocketStor 5422 is the industry's fastest dual-bay USB 3.0 storage dock, and is ideal for high-speed 6Gb/s SATA SSD's and 4TB hard drives. The innovative dual-5Gb/s bay architecture and UAS support deliver an unprecedented level of transfer bandwidth for a USB-based storage solution. Dual-Dedicated 5Gb/s Performance. UAS Protocol Performance Boost! Optimized for SATA 6G SSD. PC and Mac Compatible.