Solution: 1. Mount to sudo mkdir-P/mnt/DIR under/mnt to create a directory named dir under/MNT, you can use this directory name as needed. Then run the sudo gedit/etc/fstab command to open the fstab file and add a line in it:/dev/sdax/mnt/DIR ext3 relatime 0 2. Since you understand mounting, it is not difficult to understand this line. Here/dev/sdax is the partition you want to mount and you need to change it to your own. For example, the/dev/sda5/mnt/DIR is the directory path we created earlier. If you mount it to another directory, change it to your own. Then enter the command: sudo Mount-a to make the mounting take effect. Use the CHOWN command and chmod command to set the/mnt/DIR directory permission, and then enter the command: ln-S/mnt/DIR ~ /DIR: Create a soft link to/mnt/DIR to the Dir directory in the main directory. After you open dir in the main directory, you can directly access/mnt/Dir.