this media checker to me from http://noeld.com/ to scan a cd for errors. it was a boot disk, a program called phlak, and when it got to a certain point in the startup it would have a cd i/o error. well, i burned a new copy of the phlak iso and it worked fine, but after running this scanner on the cd that didnt work, it says there are no errors. Is it possible that the scanner is not working?