Some movies DON'T have an AUDIO_TS folder? Why??

[defense]

I've recently noticed some of the older movies don't have an "AUDIO_TS" folder. They just have a VIDEO_TS folder. One example of this is on the first Nutty Professor. Another example would be "Election." Both of those movies are single layered or DVD-5's. Nutty Professor came out in 1996, while Election came out in 1999. I don't know if it has anything to do with being older movies, but I have ripped other much older movies and have never come across any, until now, which ONLY have a VIDEO_TS folder. I had always assumed, because I had NEVER seen any files in the AUDIO_TS folder, that is was just there for compliance reasons. Just like those folders should be in all caps, I thought you HAD to have an AUDIO_TS folder. Once in a while I will see a JACKET folder, but that is along with BOTH the AUDIO_TS and VIDEO_TS folders.

My question is basically two-fold though. 1) Why do some movies NOT have an AUDIO_TS folder, such as the ones I've named above. And more specifically, why do most movies have an AUDIO_TS folder, but NEVER have anything in that folder? And the second question, which is really the one I am concerned with is, should I just burn my backup of those movies WITHOUT the AUDIO_TS folder, just like the original. Or should I create an AUDIO_TS folder anyway. This is very interesting to me, and I would appreciate it if someone would give me some info on this, because I am not going to burn those movies until I know for sure. Thanks in advance!

HAPPY NEW YEAR!

[MOVIEGEEK]

I pondered the same question some time ago and now I add AUDIO_TS folder to make sure it is compatible with all DVD players.The folder is still
undefined according to the "DVD Forum".

[defense]

thanks MovieGeek, that is interesting, sounds like the "forum" is undefined in a lot of things, such as the "+" format. That's ok, they can be undefined, but I know the "+" format has been great to me. Speed, quality, everything. Anyway, I will add an AUDIO_TS folder to those movies, as well as any other I may encounter in the near future. Thanks for the info!