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Thank you for your fast reply, I checked the disk thoroughly and found that in one place there is a slight mold in the disk which you only see when close looking at it. Never had that before, but that explains why it doesn't work. Thank you so much for your help!

Hello, I tried to make a copy of How to train you Dragon 2, and decryption seems to work fine (I get to select titles etc). The problem starts when I click MakeMKV to start the process. The BD Drive starts spinning, data is written to the HDD, but then I receive Error messages like so: Fehler 'SCSI-...