Recent Problem with Data DVDs

[dld2007]

I just recently downloaded some video files. 24 episodes of a show I watched as a child. I converted them using PS3 Video 9 to AVC-MPG4 files. I burned the 24 episodes onto 3 data DVDs, 8 episodes each. The first two dvds worked fine, I could open the DVD and click on the file and it would play. The last DVD though could not find any files on it. All three DVDs were converted the same way and burned the same way onto the same type of blank dvd... can someone help me out so that I dont have to download each file from my computer to my PS3 via the Media Center?
Thanks in advance.
Dennis