It seems to be solved, because:
[admin@(none) root]$ df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/root 2816 2816 0 100% /
/dev/discs/disc0/part1 75117788 32840 71269112 0% /tmp/harddisk

Thanks to Oleg, but can you also explain to me, why this is so?

Brennivin