Disc-Usage-Plugin, Motherboard Sensors, RPi Monitor all different values

[McMelloW]

That is also the reason that I wrote the Disc usage plugin (https://github.com/Xorfor/Domoticz-Disc-usage-Plugin). The standard Motherboard sensors only displays some directories. With the Disc usage plugin, I am able to also monitor mounted disks.

With the use of this plugin I get a disk Usage figure. However this figure is different from two other monitors
Motherboard sensors: 28.5%
Disc-Usage-Plugin using / : 32.8%
RPi-Monitor (by Xavier Berger) using / : 28.5%

Code: Select all

pi@mcmellow-pi:~ $ df -k  shows the following:
Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root       30574396 8714836  20554712  30% /

How do I read these different figures? Why are they all different?