WD 2TB Gold My Passport Ultra Metal Anniversary Edition Portable  External Hard Drive  -  - WDBEZW0020BCG-NESN Bold, aluminum radial-spin design Automatic, local and cloud backup Password protection and 256-bit hardware encryption . Premium storage with up to 2 TB capacity USB 3.0 connectivity; 3-year limited warranty Compatibilty : Formatted NTFS for Windows 8 or higher, Windows 7 or Windows Vista operating system. Requires reformatting for Mac OS X