WD Elements desktop storage with USB 3.0 offer reliable, high-capacity, add-on storage, ultra-fast data transfer rates, universal connectivity, and 4 TB capacity. Includes a free trial of WD SmartWare Pro automatic backup software.USB 3.0 and USB 2.0 compatibilityWith this single drive you get compatibility with the latest USB 3.0 devices and backward compatibility with USB 2.0 devices as well.Maximum transfer ratesWhen connected to a USB 3.0 port, WD Elements desktop storage delivers ultra-fast data transfer rates.Improve PC performanceWhen your internal hard drive is almost full your PC slows down. Don\'t delete files. Free up space on your internal hard drive by transferring files to your WD Elements desktop storage and get your computer moving again.Massive capacity in a sleek designThe sleek design offers 4 TB capacity, making WD Elements desktop storage the ideal solution for easy, add-on storage of all your important photos, music, videos and files.Free trial of WD SmartWare Pro backup softwareWD Elements desktop storage comes with a trial version of WD SmartWare Pro backup software. This backup software allows you to back up your files to your WD Elements drive or to the cloud using your DropBox account.WD quality inside and outWe know your data is important to you. So we build the drive inside to our demanding requirements for durability, shock tolerance, and long-term reliability. Then we protect the drive with a durable enclosure designed for style and protection.Formatted for Windows Formatted NTFS and compatible with Windows 8, Windows 7, Windows Vista or Windows XP. Can be reformatted for Mac.