On 9/25/19 8:54 AM, Ted Park wrote:
You must understand that the ISO9660 file system is an *additional*
abstraction on the DVD. A real DVD video player does not know how to
read a file system, but rather uses other raw information to access its
tracks (or whatever you want to call them) correctly. On copy-protected
(video) disks, the ISO9660 file system is a big fake to fool programs
which mount the file system. Files may appear much larger than they
should be, stuff may be hidden, sectors with I/O erros may be included,
and so on.
IMO, you need to copy your images with something which operates on the
raw device, not on the file system.
Anyone: please correct me if I'm wrong. My experience with DVDs is a
bit aged. ;-)
I know it is possible to have no iso9660 filesystem on a dvd at all, which
might be the reason behind the lack of any info from isoinfo. Also, I agree
that working on the raw device is the ideal approach to take, but in theory
only. After all, OP ended up where we are now after dd copied 20+ GB’s from
/dev/sr0.
DVD is proprietary and licensed in a way that drive manufacturers have to
implement scrambling. It’s been broken for a while now, but if you don’t do
anything to work around it, the actual block device will lie to you when asked
to read from a copy protected disc.
Thank you Ted for this revelation. I had no idea .....
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