WD My Passport Ultra USB 3.0 Portable External HD, Red, 2 TB Capacity: 2 TB Interface: USB 3.0 OS Compatibility: Formatted NTFS for Windows 8 or higher, Windows 7 or Windows Vista operating system. Requires reformatting for Mac OS X USB 3.0 - Up to 5 Gb/s USB 2.0 - Up to 480 Mb/s USB Powered: Yes Operating Temperature: 41 to 95F / 5 to 35C Non-Operating Temperature: -4 to 149F / -20 to 65C