Cavalry USB 3.0 Portable External Hard Drive Enclosure EN-CAUG-3B (Black) USB 3.0 SuperSpeed Interface For Mac compatibility this Hard Drive requires reformatting. Refer to Application Guide for guidance on this Up to 5 Gbit/s, It will fit 2.5 inch hard drives. Backwards-compatible with USB 2.0 USB-powered. No external power source needed Plug-and-Play for Windows PCs