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?

  • BCsven@lemmy.ca
    0·
    25 days ago

    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

    • nixFREAK@sopuli.xyz
      0·
      25 days ago

      Yeah I was going to say , that’s not right, optical format can survive if the median is taken care of.

    • cmnybo@discuss.tchncs.deEnglish
      0·
      25 days ago

      Pressed discs last for decades, but they still fail and should be backed up. I’ve never heard of anyone wanting to keep the DRM before though.