Is there a way to verify that data on a rented DVD is viewable? I rent DVDs using Blockbuster online. The service is pretty good but I find myself sitting down to watch a movie and it is flawed/damaged to the point that it is not viewable. So, is there some software with which a DVD movie can be quickly verified as readable? The point being that if I detected an unviewable DVD I could send it back before actually sitting down to view it.