ecko..that goes against the more popular view that ripping is always an important step to do FIRST.
plus there are the advantages of ripping with the anydvd ripper (as the original poster has done) of automatically running fixvts on the files as they are being ripped to the hard drive. This eliminates structural errors on the disc itself. ripping first eliminates the drive itself as a source of the error and many programs will have problems if newer movies aren't ripped first (ie dvd shrink)
also in regards to your advice to slow down the write speed...this doesn't solve anything since the original poster has not even hit the "write" phase of the backup process. please read the post before offering advice!
@ DMack: I apologize that i can't help you. I'm not familiar with that exact error message, but i can tell you that write speed and ripping first has nothing to do with it (even though it is a good idea to keep the write speed at the rated speed of your media for quality discs and a tiny bit lower for questionable discs once you HAVE hit that phase in teh backup process)
is the entire process taking a long time? if so, have you by chance checked to make sure DMA is enabled for your drive? it's possible for drives that are running in PIO mode to error out due to the speed (or lack thereof) or communication within the case.
also a couple additional questions: does it do this for EVERY disc you attempt to copy or just specific ones? if specific, then what ones?
for the discs that this DOES occur on, does it happen at exactly the same place?