Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             75455616  27305216  44317468  39% /
none                    379592       348    379244   1% /dev
none                    383816       268    383548   1% /dev/shm
none                    383816       316    383500   1% /var/run
none                    383816         0    383816   0% /var/lock
none                    383816         0    383816   0% /lib/init/rw
none                  75455616  27305216  44317468  39% /var/lib/ureadahead/debugfs
/dev/sdb1             76920416  38289016  34723992  53% /mnt/backup_drive