Model Name Model Number Capacity Interface Expansion 1TB Portable External STEA1000400 1TB USB 3.0 Expansion 2TB Portable External STEA2000400 2TB USB 3.0 Expansion 3TB Portable External STEA3000400 3TB USB 3.0 Backup Plus Slim 500GB Portable External STDR1000100 1TB USB 3.0 Backup Plus Slim 1TB Portable External STDR1000100 1TB USB 3.0 Backup Plus Slim 2TB Portable External STDR2000100 2TB USB 3.0 Backup Plus 4TB Portable External STDR4000100 4TB USB 3.0 Backup Plus 5TB Portable External STDR5000100 5TB USB 3.0 Backup Plus fast 4TB Portable External STDA4000100 4TB USB 3.0 Wireless Plus 1TB Portable External STCK1000300 1TB WiFi,USB 3.0 Wireless Plus 2TB Portable External STCK2000300 2TB WiFi,USB 3.0 Wireless Plus 500GB Portable External STCK3000300 3TB WiFi,USB 3.0 Wireless Mobile 500GB Portable External STDC500101 500GB WiFi,USB 3.0