Joel W. Shea via luv-talk wrote:
3. this is similar to hard links (or btrfs/ZFS shared reflinks), and removing them due to incautious copying. Example: (...)
Probably an apt analogy, since the VOB files in the directory structure are able to reference the same VOBs (or subsets thereof) on disc, albeit it gets more complicated than that, i.e. the DVD-Video format includes it's own machine-language and VM.
I thought the *whole point* of DVDs was that they threw away most of Red Book and made everything ALWAYS packet-based and ALWAYS UDF, and the "movies" were done at a higher layer (i.e. they're just files on the UDF, laid out in a certain way). Am I wrong? A glance at Wikipedia's DVD Video article doesn't turn up any glaring contradiction.