I recently installed Knoppix to my HD and all went well (eventually). But now as I take files which I backed up from my computer and try to copy them to hda4 it tells me that access is denied to mnt/hda4. I can't seem to put anything onto this partition, what could my problem be?

as before I am new to Linux, so if I haven't given enough information please ask me specifically for what you need to know.

Thanks,
Seeger