root@ip-172-31-26-59:/dev # gpart show
=>       0  62914560  ada0  BSD  (30G)
         0        16        - free -  (8.0K)
        16  20971504     1  !0  (10G)
  20971520  41943040        - free -  (20G)

root@ip-172-31-26-59:/dev # df -h
Filesystem    Size    Used   Avail Capacity  Mounted on
/dev/ada0a    9.7G    2.1G    6.8G    23%    /
devfs         1.0K    1.0K      0B   100%    /dev