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?
Does
ddrescuestill check every sector even if there are no bad blocks? I’m worried it might just copy sectors without verifying, which could mean the backup isn’t a perfect copy.It’s just dd with extra flags enabled for data recovery.
Good to know, I’ll definitely check it out