USB 3.0 and USB 2.0 compatibility – With this single drive you get compatibility with the latest USB 3.0 devices and backward compatibility with USB 2.0 devices as well. Fast transfer rates – When connected to a USB 3.0 port, WD Elements portable hard drive delivers fast data transfer rates. Improve PC performance – When 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 portable hard drive and get your laptop moving again. High capacity in a small enclosure – The small, lightweight design offers up to 4TB capacity, making WD Elements portable hard drives the ideal companion for consumers on the go. WD quality inside and out – We 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 10, Windows 8.1, Windows 7. Can be reformatted for Mac or other operating systems.