bot ck is right the best setings are default
however if you do have a scratched cd it is posible to make a backup with the error on ignore but you wont get a true copy i tend to use this if i try to burn a video hire shop copy as they are not looked after very well and have a lot of scratches another way is to d/l a cue and bin or iso and burn that might take a while though if you only have 56k