WD 1TB Blue Black My Passport Ultra Metal Edition Portable External Hard Drive USB 3.0 Sleek, stylish aluminum design Automatic, local and cloud backup Password protection and 256-bit hardware encryption Premium storage with up to 1 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