I've got some video files on a DVD (not a video DVD) that won't copy over because there's something wrong with the DVD and they fail CRC check. I believe the problem is only in a few places, and since ...

A Cisco switch connected to Cisco PIX firewall via cat5. The switch-side sees CRCs, the firewall side doesn't. Both are hard-set for 100/full. Is this just likely a bad cable, or could it be something ...