WD 1TB WD Elements Portable USB 3.0 Hard Drive Storage (WDBUZG0010BBK-EESN) Ultra-Fast USB 3.0 data transfers.Massive Capacity Formatted NTFS for Windows 10, Windows 8.1, Window 7. Requires reformatting for Mac OS X . Compatibility may vary depending on users hardware configuration and operating system. Free trial of WD SmartWare Pro auto and cloud backup software WD quality and reliability 1-year limited warranty