Where is my available disk space?

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1

Dolphin - file manager shows about 300MB free disk space
KDE partition manager shows c.a. 7GB.

Unfortunately Dolphin is right.
Why there is so huge difference?

How to find unseen files?

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2

Filesystems like ext4 reserve space for root. This is useful on the Root partition. For a data partition, this is often unwanted and not necessary.

See the Arch Wiki for more information on this.
https://wiki.archlinux.org/title/Ext4#Reserved_blocks

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3

recheck from / with

df -Th
4

indeed
/dev/sdb2 ext4 102G 97G 282M 100% /run/media/icetiger/ROBO

5

thank you
sudo tune2fs -m 1 /dev/sdb2
helped to solve my problem

6

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