Try the original and see if it does the same thing. Friend had this issue with his backup then played with his original and same thing happened. then he pulled the HDD and tried it and no my unreadable disc. then he put the hard drive back in and tried it and it was fixed. Others have had same issues from what I have seen and they tried formatting HDD and still had this problem. No Problems here so far. Good Luck.
i would say it is more your drives (possibly burner) than anything else as i have not had 1 issue that you speak of using a sh-d162c w/ kreon .081, xbc 2.5 @ 12x and a pioneer 111d @ 4x on verbatim dvd+r dl using the dangerous brothers 1.29 region free firmware. i can say that halo3 gives me no issues, but i haven't bought cod4 yet so i can't talk about that one.
the reason i bring up the region free firmware is that for some reason, the quality of the burns are much better when using the dangerous brothers firmware vs regular pioneer. when testing a backup on a benq dvd-rw (one of the best in terms of getting a good scan on a pc) the regular pioneer firmware would give me a quality of 0%, where the dangerous brothers would give me a quality of 94%+, in comparison, store bought pressed movies would give me a quality of 95-97%, so my backups are about as good as they can get. and i have done quality tests burning at different speeds, and 4x is the sweet spot - better than any other (IMG:
style_emoticons/default/smile.gif)
before i switched the burner firmware, my backup would hiccup a little on rb6:v but my original would not. after upgrading to the dangerous brothers firmware, the backup was identical to the original - no hiccups at all (IMG:
style_emoticons/default/smile.gif).
hope this helps.