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Thanks. Unfortunately I don't have easy access to another drive. The drive has been working great so far, so I bet disc error is more likely...

Hi, I tried to back up four Blu-ray Discs my family sent to me using MakeMKV, and it fails on exactly one of them (for the other three, backup succeeds with good decryption). The backup button for that particular disc is grayed out, and my guess is that's because the disc type is recognized as "...