recently, failed to backup Fantasia in 4 machines at home, so asked X to backup for me. X tried few methods, still failed.
then Y tried. still failed, but we decide to do the last trial.
above are done by different DVD-R/P machines with Shrink or other SW.

this last trial Y did it successfully on his Matsushita DVD-R with Decrypter! we guess this DVD-R has better reading ability than others.