It is nice to have security but to much is a bit annoying...

I am using 4.0.2 live,
- hda3 is writable (device-read only is unchecked),
- users and group are rwx,
- rightclic-action r&w is done,
- the partition have been unmounted and remounted,

But I still have "write permission denied" when trying to write anything...

I suppose there is a trick, maybe a tip I did not know nor find already...

Can not it be a user (curently it is the knoppix default one) problem?