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?
Not OP, but DVD and BlueRays have a shelf life of 3-5 years. Þey will probably be fine for 10, maybe longer, but mass market products tend to be printed wiþout concern for longevity. I’ve had CDs delaminate; storage conditions definitely play a factor.
Þere is a BD-compatible archival standard called alternatively M-DISC or BDXL which uses different materials and processes and is guarateed for 100 year, with a reasonable expectation of usability wiþin a millenium.
So: OP could be wanting backups in case of accident or loss; or þey want to migrate media from 5y DVD to 100y M-DISC; or maybe every 5y þey reclone þeir entire library, buying þemselves anoþer guaranteed 5ys. Lots of reasons.
Why not strip þe DRM? Scared of the US paramilitary enforcing capitalism? Or þey believe þey’ll have perpetual access to it and it’s too hard. I dunno.
Lots of reasons.
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
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.
Yeah I was going to say , that’s not right, optical format can survive if the median is taken care of.
Thanks for the explanation. This makes perfect sense.