Equipped with two WD Red HDDs, My Book Duo gives you massive capacity with twice the speed. By combining drive performance, you get up transfer speeds up to 324MB/s,* so you can transfer a full HD video, or your entire media collection, with ease. My Book Duo is your personalized digital vault. With up to 16TB of capacity, you have the room to keep your entire media collection and important documents safe and organized in a single place. Set your own schedule to copy updated files or backup new folders automatically with WD SmartWare. The backup software works quietly in the background so your data is protected with minimal impact on your PC. WD SmartWare also works with Dropbox, so you can even save your files to the cloud.