Thermaltake BlacX Duet 5G Dual SATA Hard Drive Docking Station USB 3.0 5.0Gbps ST0022U. Blazing fast data transfer with USB 3.0 SuperSpeed. Up to 5.0 Gbps. Supports all SATA hard drives: SATA I, II and III (6 Gbps) with any capacity Maximum transfer speed is determined by the host controller. Conveniently hot-swap hard drives without having to use an external enclosure. Fully backward-compatible with USB 2.0. Asynchronous signaling method utilized in USB 3.0 SuperSpeed interface allows the BlacX 5G to operate in bi-directional data interface rather than half-duplex arrangement found on USB 2.0. Data copying between two hard drives has never been easier with BlacX Duet 5G's ability to support dual hard drives at one time.