Too much space occupied by several filesystems

By pkaramol

Here is the output of the df -h command on my recently set up Ubuntu 16.04.01

df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3,9G     0  3,9G   0% /dev
tmpfs           790M  9,8M  780M   2% /run
/dev/sdb5       213G   75G  128G  38% /
tmpfs           3,9G  152M  3,8G   4% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           3,9G     0  3,9G   0% /sys/fs/cgroup
/dev/sda1       459G  3,9G  432G   1% /mag
tmpfs           790M  108K  789M   1% /run/user/1000

/dev/sdb5 is a SSD of 240G and /dev/sda1 a HDD of 500G.

My questions is what are the following filesystems that eat up so much space and if there is a way to reclaim that space (if it is not critical for the system of course!).

udev (on /dev) (3.9G)

tmpfs (on /dev/shm) (3.9G)

tmpfs (on /sys/fs/cgroup) (3.9G)

My main problem is that apparently that space has been deprived from the SSD and not the HDD.


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