Use the following command to get the UUID of the secondary disk:
# Assume your secondary disk is "/dev/sdb" and has only one partation.sudo blkid /dev/sdb1
Add the following line into the “/etc/fstab” file:
# Assume mount the partation to the "/home/user/mount" directory.UUID=8eec26f6-7fea-46d6-b385-f5ba13c24f5e /home/user/mount ext4 defaults 0 2
# About the meaning of the columns you can read the reference links.