Filesystem      Size  Used Avail Use% Mounted on
/cow            1.9G  1.9G   64M  97% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            1.9G   12K  1.9G   1% /dev
tmpfs           1.9G  2.0M  1.9G   1% /tmp
tmpfs           388M  1.3M  387M   1% /run
none            5.0M  4.0K  5.0M   1% /run/lock
none            1.9G   84K  1.9G   1% /run/shm
none            100M   84K  100M   1% /run/user
/dev/sdb1        29G  2.0G   27G   7% /cdrom
/dev/loop0      939M  939M     0 100% /rofs