Comparing disk usage before and after Archlinux upgrade to a fresh install

Test scenario

Install Archlinux 2007.08

Install using Archlinux-i686-2007.08-2.core.iso, as default as it could be.
Run ‘pacman -Scc’
Run ‘df -h’ and write down result.
Run ‘pacman -Q | wc -l’ and write down result.

Upgraded to 2008.05.20

(Archlinux uses a rolling release, so this is the latest “release)
Run ‘pacman -Suy’, and follow instructions.
Reboot
Run ‘pacman -Suy’ again
Run ‘pacman -Scc’
Run ‘df -h’ and write down result.
Run ‘pacman -Q | wc -l’ and write down result.

Install Archlinux 2008.05.20

Install using arch-ftp-install-2008.04-rc-i686.iso to start a FTP installation
Run ‘df -h’ and write down result.
Run ‘pacman -Q | wc -l’ and write down result.

Results

Archlinux 2007.08-core
Disk usage: 475,5M
Number of install packages: 93

Archlinux upgraded to 2008.05.20
Disk usage: 549M
Number of install packages: 96

Archlinux 2008.05.20
Disk usage: 549M
Number of install packages: 96

Conclusion

Perfect!