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With my limited experience, I've seen no noticable difference between using -R and +R DL. One advantage some see is that +R DL can be booktyped to ROM and some burners even do it automatically. I noticed some of the Sony drives booktype, so that should be of interest to you.
VOBs are usually part of the VIDEO_TS folder which holds the IFO, BUP, and VOB files that comprise a DVD. You're talking about DVD compliant MPEG 2.
Booktyping has nothing to do with burning, except that's when the files are written. DVD ROM is the universal format for DVD players. So, theoretically, if you booktype to DVD ROM all players should play the recorded disc if you have compliant files. Play, not burning, is the issue. It's also a niche situation as most players play at least -R and/or +R besides ROM. Few players can be found that only play DVD ROM. If a person doesn't have a burner that booktypes to ROM and has such a player, it is cheaper to buy a player than get a new burner that booktypes. If a person has booktyping ability, there's no reason not to use it though. As for the setting, once set the drive normally uses the selected booktype as the default. Even the freeware DVDInfoPro can be used to set booktyping if the drive has the capability.
As for myself, I've never had a problem with ISO or File modes in burning. ISO is sort of like DVD ROM for players, it's more universally used in burning apps. Notice DVD Decrypter and it's newer counterpart, ImgBurn, only burn in ISO. In case you hadn't noticed, inside ISO is a VIDEO_TS folder with all the files I mentioned before. ISO is dealt with more as a continuous stream, whereas software logs the individual segments when doing things in File mode (same material, just handled slightly different). Some of the DL problems have been addressed in the Nero 7, so you may want to try the trial from Nero.com to see how it works for you. Then if you still have layer break problems, shop around. A friend of mine even said he had DL problems with DVD Decryter and Imgburn.
This message has been edited since posting. Last time this message was edited on 6. February 2006 @ 21:26
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