Soooo, we have a couple educational VCDs from Taiwan. Upon insertion, they mount as 2 volumes, Audio CD and VIDEODISC. A quick Google said to browse to VIDEODISC/MPEGAV and play the DAT files there, which were essentially MPG files with extra (unspecified) data. But, on both discs every .DAT file has an i/o error. It's disc/OS interaction level - Finder won't copy the files, and a Disk Image creation failed (Error message: Invalid Argument), and Disk Utility kind of hangs at exit.
I don't know well the discs were taken care of, so I could see maybe one or two files that would have corruption, but not issues with every .DAT file (70+ files across 2 discs). They're Windows formatted volumes (the VIDEODISC volume has a Windows VCD player executable) but that never was an issue before. The fact that Disk Utility not only decides not to copy, but seems very confused in general.