nabootuj live iso Linuxu (Ubuntu/Fedora), následne príkaz:

sudo du -ahx /<YOUR_TARGED_DISK> 2>/dev/null | sort -rh | head

YOUR_TARGED_DISK nahradis tym, pod cim sa ti to mountnulo.

Výsledok:

test@fedora:~$  sudo du -ahx / 2>/dev/null | sort -rh | head
[sudo] heslo pre pou\u017e�vate\u013ea test: 
8,3G	/
6,2G	/usr
2,4G	/usr/lib64
2,1G	/var
1,9G	/usr/share
1,8G	/var/lib/flatpak
1,8G	/var/lib
1,7G	/var/lib/flatpak/repo/objects
1,7G	/var/lib/flatpak/repo
1,3G	/usr/lib
test@fedora:~$  sudo du -ahx /usr 2>/dev/null | sort -rh | head
6,2G	/usr
2,4G	/usr/lib64
1,9G	/usr/share
1,3G	/usr/lib
484M	/usr/share/locale
417M	/usr/bin
415M	/usr/lib64/libreoffice
382M	/usr/lib/firmware
292M	/usr/lib64/firefox
237M	/usr/lib/jvm/java-25-openjdk
test@fedora:~$  sudo du -ahx /usr/lib64 2>/dev/null | sort -rh | head
2,4G	/usr/lib64
415M	/usr/lib64/libreoffice
292M	/usr/lib64/firefox
210M	/usr/lib64/libreoffice/program
151M	/usr/lib64/firefox/libxul.so
146M	/usr/lib64/libreoffice/share
139M	/usr/lib64/libLLVM.so.21.1
112M	/usr/lib64/python3.14
108M	/usr/lib64/libreoffice/share/config
85M	/usr/lib64/libwebkit2gtk-4.1.so.0.19.3