This topic is quite subjective - I know very well and please don't make accusations or call me biased. Today I tried to rip the UHD The Predator. CloneBD had a read error right at the beginning and suggested to clean the disc. There were fingerprints on it and I did so. Again read error right at the beginning. Then I copied the disc with MakeMKV and no read errors. I took these files as a base to run it through CloneBD for making a 50Gb UHD disc and a 25 Gb BluRay movie only. Was perfect. I had similar issues before and didn't have MakeMKV installed. I used then AnyDVD to rip discs with read errors. The downside is that AnyDVD just continues at a certain point and doesn't care about read errors. So you can copy the disc with errors but if you want to process the result with CloneBD the program will fail with the files AnyDVD created with read errors. As a note: These errors were most likely more severe than that the one I saw today. So the truth is most likely somewhere in between. Bottom line: I think CloneBD should get an option to keep trying to re-read smudged discs as an option in the general settings section and / or use error correction - if not used already. No big deal since I found workarounds but that should maybe put on the "CloneBD list of things to do".