Filesystem      Size  Used Avail Use% Mounted on
udev            3.9G     0  3.9G   0% /dev
tmpfs           788M  9.7M  778M   2% /run
/dev/sdb1        15G  1.2G   14G   8% /cdrom
/dev/loop0      1.1G  1.1G     0 100% /rofs
/cow            3.9G  628M  3.3G  16% /
tmpfs           3.9G  672K  3.9G   1% /dev/shm
tmpfs           5.0M  8.0K  5.0M   1% /run/lock
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
tmpfs           3.9G  1.1M  3.9G   1% /tmp
cgmfs           100K     0  100K   0% /run/cgmanager/fs
tmpfs           788M   96K  788M   1% /run/user/999