OEM-Genuine Transcend ... TS256GESD400K ... 256GB ESD400 USB 3.0 Portable Solid State Portable Hard Drive with 256GB Capacity Read Speed up to 410MB/s Write Speed up to 380MB/s Powered via USB 3.0 Port USB 3.0 Cable and Travel Pouch Included Ultra Thin with 0.4" Height for both Windows and Mac