dd and DVD's
Here's my thought process: dd is a byte-copy program. It will copy the exact bytes of the input file and output them exactly to an output file. I can access my DVD via /dev/dvd. In theory, I can use dd to copy /dev/dvd (when I have a disc in, of course) to a .iso file for care-free backup.
My logic is flawed somewhere, because this rarely works.
I know that most, if not all, DVD's are encrypted, but if dd doesn't care about encryption and would just copy those encrypted bits, there wouldn't be a problem and I could make a backup of my DVD that would play fine on the DVD player. But dd does not do this, and comes back to me with some error that escapes me now.
Why is it that dd cannot make backups of most DVD's? In theory, it makes sense to me. Or am I missing some options?
**Please note, I am not actively trying to create a backup DVD, I'm curious about the operations of dd.
My logic is flawed somewhere, because this rarely works.
I know that most, if not all, DVD's are encrypted, but if dd doesn't care about encryption and would just copy those encrypted bits, there wouldn't be a problem and I could make a backup of my DVD that would play fine on the DVD player. But dd does not do this, and comes back to me with some error that escapes me now.
Why is it that dd cannot make backups of most DVD's? In theory, it makes sense to me. Or am I missing some options?
**Please note, I am not actively trying to create a backup DVD, I'm curious about the operations of dd.
