I'm resizing a FAT32 partition (the only partition on hda) with qtparted in knoppix... this is what I did:
1) unmount hda1
2) su at terminal
3) uncheck "Read Only" at hda1's properties
4) open qtparted and resize

However, when I do this, I get the following error: An error happen during ped_file_system_open call. What am I doing wrong?