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So I changed the Preference I/O setting to 10 and retry Avatar without success. I have tried other movies without a single problem, so at this point I gave up on Avatar. Thanks for trying Woodstock!

My Preference I/O is set to 5, should I change it to 10 instead?

Yeah, I was excited that it might actually finish backing up without fails - but that was short lived. That said; here is what the log stated when it failed to backup:

Read rate: 8.0 M/s [0.9X]

Thanks Woodstock for your response. I took your advice and connected the External BD drive to its own power cord, as well as plugged in my Macbook Pro. Re-backup Avatar and got the same error message. The disc is clean and free from scratches, so I am still at a lost on what to do. Make MKV Error Lo...

Finally got around to backing up my collections of BluRay movies. Was successful with several movies until I got to Avatar, and can not understand the problem with this movie. Relatively new to this and need your help in solving this issue. MacBook Pro (13-inch, Late 2011) Processor: 2.4 GHz Intel C...