It's not possible to ignore errors -- either on the blank, or on a source disc -- when copying or burning a DVD. Burning is a realtime linear process, and cannot wait for an unspecified amount of time for a source to become readable again. If for no other reason, the drive would be harmed by such a long write operation.
At most, a bad disc can be read first to a hard drive, as an image file. And then the image file can next be burned to a blank DVD.
A bad blank is trash.
ISO Puzzle can attempt to read a disc in a non-linear way, or create a good image. It will fail on significantly damaged media.
Download it here:
http://www.digitalfaq.com/forum/medi...-data-bad.html
DVD Decrypter can attempt to skip errors when linearly reading a disc. However, those bad spots will be replaced by zeroes, and the data will be lost. Files will be destroyed. Video will have skips, pauses, etc. Audio will have pops, hiccups, etc. On discs with significant zero replacements, audio/video playback may fail entirely on the new copy. Download it here:
http://www.digitalfaq.com/forum/dvd-...-download.html
Good luck.