With an 6TB internal hard drive (HDD), you can expand the internal storage of your PC. This comes in handy when you edit a lot of videos and want to store them too, for example. You can easily install a 6TB HDD in your NAS. With a 6TB internal hard drive, you'll have enough room for 150 4K movies of 2 hours each, 660 music albums, or 600,000 photos. Once it's built in, you can start saving files on your computer.