I started Knoppix 4.0.2 DVD using

Code:
knoppix gmt lang=fi bootfrom=/dev/hdb1/DVD.iso
Now if I right-click "Hard Disk [hdb1]" on Desktop and choose Actions->Change read/write mode, I get this error after confirming the action:

The remount command failed. Maybe there is another process accessing the filesystem currently.
I can still do this manually with
Code:
sudo mount -o remount,rw /cdrom2.loop