I am working on a project to make backup copies of a bunch of DVDs for a friend. Almost all are older single layer movies which can be backed up quickly by ripping with Decryptor to an ISO and burning that back onto a blank. I've been using TY02 disks and Verify after Burn in Decryptor, and quite often it all completes without incident, but sometimes it stops during verify with an unrecoverable read error. I've looked at a couple of these with Nero CD-Speed Scandisk, and it usually shows two or three yellow (damaged) or red (bad) squares in the display. When I look at the list of files at the bottom of the Nero window it still gives a quality score of 100 for each chapter. I don't have the time to sit and watch these disks - I did throw one into a conventional player and can report it played through without locking up and returned to the menu at the end. In real time, real world settop DVD playback, how severe are errors like this liable to be, and how many should I ignore before I can consider I have a coaster? Is there a better tool than CD-Speed to assess condition?