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