With this Memory Case Duo Pack, you can make many backups of your documents. This bundle contains 2 external HDDs of 2 terabytes each. That's enough storage space for, for example, 400 full HD films of 2 hours or 40,000 photos. You can also use one of the HDDs for backups of your documents in case the other breaks. With a transfer speed of 85 megabytes per second, you can upload 8 photos at 10 MB per second, and the drives are ready for any operating system without needing to be formatted in advance. At 12 centimeters per hard drive, you can easily carry the drives in your jacket or bag, so you always have all your files with you.