Western Digital Elements ( 4TB ) Portable HDD external hard Drive { WDBU6Y0040BBK } Features USB 3.0 and USB 2.0 compatibility: With this single 5TB hard 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. Massive Capacity In A Small size: The small, lightweight design offers up to 5TB capacity, making WD Elements portable hard drives the ideal companion for consumers on the go. 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. WD official website More storage products Specifications Capacity: 4TB Interface: USB 3.0 and USB 2.0 Compatibility: Formatted NTFS for Windows® 10+. Reformatting may be required for other operating systems. Compatibility may vary depending on user’s hardware configuration and operating system. Dimensions (L x W x H): 4.35″ x 3.23″ x 0.83″