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In that example, I used the 
-t
 option along with the type of filesystem I formatted 
the device with. In the first example, I didn't. This is because, in most cases, the 
mount
 command is able to determine which type of filesystem the device uses and 
adjust itself accordingly. Thus, most of the time, you won't need the 
-t
 option. In the 
past, you almost always needed it, but it's easier nowadays. The reason I bring this 
up is that if you ever see an error when trying to mount a filesystem that indicates 
an invalid filesystem type, you may have to specify this. Feel free to check the man 
pages for the 
mount
 command for more information regarding the different types of 
options you can use.
When you are finished using a volume, you can unmount it with the 
umount
 
command (the missing 
n
 in the word 
unmount
 is intentional):
sudo umount /mnt/vol1
The 
umount
 command, which also needs to be run as 
root
 or with 
sudo
, allows you 
to disconnect a storage device from your filesystem. In order for this command to 
be successful, the volume should not be in use. If it is, you may receive a device or 
resource busy error message. If you execute 
df -h
 after unmounting, you should see 
that the filesystem is missing from the output, and thus isn't mounted anymore.
The downside to manually mounting devices is that they will not automatically 
remount themselves the next time your server boots. In order to make the mount 
automatically come up when the system is started, you'll need to edit the 
/etc/fstab
 
file, which I'll walk you through in the next section.