WD Elements portable hard drives with USB 3.0 offer reliable, high-capacity storage to go, fast data transfer rates, universal connectivity and massive capacity for value-conscious consumers. With this single drive you get compatibility with the latest USB 3.0 devices and backward compatibility with USB 2.0 devices as well. When connected to a USB 3.0 port, WD Elements portable hard drive delivers fast data transfer rates. 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. The small, lightweight design offers up to 4TB capacity, making WD Elements portable hard drives the ideal companion for consumers on the go. 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 NTFS for Windows 10, Windows 8.1, Windows 7. Reformatting may be required for other operating systems. Compatibility may vary depending on user's hardware configuration and operating system.