norton check on HFS volumes

I have noticed that when I boot up my Mac and run Norton, it shows a lot of 'Major Errors' with my HFS volume that I use to share files with Linux. I am wondering if these really are 'major errors' in Linux, or if it is just a Norton quirk. Even with the errors, I seem to be able to use the HFS volumes with no problems in Linux. thanks Joss -- http://www.josswinn.org