You can use
df -h
This will dump out all your mounted filesystems & will appear like this.
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 25G 21G 2.3G 91% /
udev 10M 152K 9.9M 2% /dev
shm 1013M 0 1013M 0% /dev/shm
/dev/sda4 135G 115G 13G 91% /mnt/stuff
It will appear with better formatting