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Adding to the /etc/fstab file
To add another volume to the 
fstab
 file, we first need to know the 
UUID
 of the 
volume we would like to add (assuming it's a hard disk or virtual disk). Again, we 
do that with the 
blkid
 command:
blkid /dev/sdb1
Notice that I used the device name of 
/dev/sdb1
 as an argument. This is because I 
want to specifically fetch the UUID of the new device we added. The output of that 
command will give us the UUID of that device, so it can be added to the 
/etc/fstab
 
file. Copy that down somewhere, as we'll need it shortly. Next, we need to know 
where we want to mount the volume. Go ahead and create the directory now, or use 
an existing directory if you wish. For example, you could create the directory 
/mnt/
extra_storage
 for this purpose:
sudo mkdir /mnt/extra_storage
At this point, we should have all we need in order to add a new entry to 
fstab
. To do 
so, we'll need to open the file in a text editor and then create a new line after all the 
others. If you don't have a preferred editor, you can use the 
nano
 editor:
sudo nano /etc/fstab

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Managing Storage Volumes