root@OpenWrt:/# df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                   512.0k         0    512.0k   0% /dev
/tmp/root                 1.1M      1.1M         0 100% /tmp/root
/dev/mtdblock4            1.9M    276.0k      1.7M  14% /jffs
/jffs                     1.1M      1.1M         0 100% /
/dev/sda1               279.5G     55.3G    224.2G  20% /mnt/hdd
root@OpenWrt:/# umount /mnt/hdd/
root@OpenWrt:/# df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                   512.0k         0    512.0k   0% /dev
/tmp/root                 1.1M      1.1M         0 100% /tmp/root
/dev/mtdblock4            1.9M    276.0k      1.7M  14% /jffs
/jffs                     1.1M      1.1M         0 100% /
root@OpenWrt:/# ntfs-3g /dev/sda1 /mnt/hdd/
root@OpenWrt:/# df -h
Filesystem                Size      Used Available Use% Mounted on
tmpfs                   512.0k         0    512.0k   0% /dev
/tmp/root                 1.1M      1.1M         0 100% /tmp/root
/dev/mtdblock4            1.9M    276.0k      1.7M  14% /jffs
/jffs                     1.1M      1.1M         0 100% /
/dev/sda1               279.5G     55.3G    224.2G  20% /mnt/hdd
root@OpenWrt:/#