Think about this situation, you have a Ubuntu server and with your home videos or movies, books and other important files that are worth having a backup. You don’t have enough space on your laptop and also on your server the available space is almost gone. You go to a shop and buy a new HDD to make more space on your server but, when you connect it and you run lsbk you see two different discs on your system and you can’t have for examples home videos1 and home videos2 because you want to get them organized properly.