odroid@gnome-desktop:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.7G     0  3.7G   0% /dev
tmpfs           747M  1.9M  745M   1% /run
/dev/sdc2        15G  3.3G   11G  24% /
tmpfs           3.7G     0  3.7G   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           3.7G     0  3.7G   0% /sys/fs/cgroup
/dev/mmcblk1p1  240M   26M  202M  12% /boot
tmpfs           747M   52K  747M   1% /run/user/1000
/dev/sdd1       240M   27M  201M  12% /media/odroid/BOOT
/dev/sdd2        15G  9.2G  4.5G  68% /media/odroid/rootfs
odroid@gnome-desktop:~$ umount /dev/sdd2
odroid@gnome-desktop:~$ sudo fsck -y /dev/sdd2
fsck from util-linux 2.34
e2fsck 1.45.5 (07-Jan-2020)
/dev/sdd2 is mounted.



WARNING!!!  The filesystem is mounted.   If you continue you ***WILL***
cause ***SEVERE*** filesystem damage.


Do you really want to continue<n>? no
check aborted.
odroid@gnome-desktop:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.7G     0  3.7G   0% /dev
tmpfs           747M  1.9M  745M   1% /run
/dev/sdc2        15G  3.3G   11G  24% /
tmpfs           3.7G     0  3.7G   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           3.7G     0  3.7G   0% /sys/fs/cgroup
/dev/mmcblk1p1  240M   26M  202M  12% /boot
tmpfs           747M   52K  747M   1% /run/user/1000
/dev/sdd1       240M   27M  201M  12% /media/odroid/BOOT
odroid@gnome-desktop:~$ sudo fsck -y /dev/sdd2
fsck from util-linux 2.34
e2fsck 1.45.5 (07-Jan-2020)
/dev/sdd2 is mounted.



WARNING!!!  The filesystem is mounted.   If you continue you ***WILL***
cause ***SEVERE*** filesystem damage.


Do you really want to continue<n>? yes
rootfs: clean, 283645/918160 files, 2425773/3751168 blocks