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Firstly check the UUID of the disk you want to ad by using this command
sudo blkid
Copy the UUID
Then make a directory within the /media directroy e.g.
sudo mkdir /media/disk1
open up fstab
sudo nano e/tc/fstab
On the last line enter this
UUID=[insert ID] /media/library ext4 defaults 0 2
Save the file, and then mount the disk using this command
sudo mount -a