I want to create a bit-by-bit backup of my DVD and a Blu-ray disc without removing its encryption. Is dd be the best method, and if so, what flags or settings should I use? Also, is comparing the SHA-256 hash of the generated ISO file with the hash of the original disc’s raw data (read from /dev/sr0) the best method for verifying the backup’s integrity?

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[–] 8 points 5 days ago* (2 children)

I have CDs from the 80s they are perfectly fine. I think people bought super cheap R/W at some point and found them crappy, but a factory CD/DVD last a very long time

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