How do you make HDDs and partitions mount at startup on Ubuntu? I always keep my media and data files on separate partitions - one 2tb HDD and a 400 odd gig partition. I have been trying to swap the default folder location for the home directory to my other drives. It works when I change the /home/user_name/.config/user-dirs.dirs file to the directories I want, but only until I reboot the system.