The WD My Book Desktop 4TB External Hard Drive features a 4TB storage capacity perfect for storing a variety of files including HD video, movies, music, photos and more. Simply plug in your drive to a compatible USB 3.0 port and begin transferring data at speeds up to 5Gb/s. Once your data is loaded to the drive you can rest assured your data is secure as this hard drive supports both password protection and hardware encryption. You can also backup your data from the WD My Book HDD to the cloud through your Dropbox account. With WD's Windows 8 app you can access all of your files quickly and efficiently. Additionally, this drive comes preformatted to work with Windows 7, Vista and XP and can be reformatted to work with the Mac OS X operating system.