Modchips compatible with dual layer disks?

[reddragon105]

Which modchips are compatible with dual layer disks?

I understand that on dual layer PS2 games the second layer is PTP, which dvd writers at the moment can not burn, meaning a specific chip, like the DMS4 with toxic 0.3 bios, is necessary.
I also understand that some old PS2s have problems with this - many people have reported problems with GT4, many copies have been returned to games shops by people who say their PS2 won't play it, most of them have had old consoles.

Yet shouldn't all PS2s be able to read burned DVD9s (as long as they're working properly)? they all play movies, which are on dual layer disks, so if you copied a movie onto a burned DVD9, a PS2 should be able to run the movie right? What is the difference between a DVD9 movie and DVD9 game?

If not... then which chips are compatible with burned DVD9 games?
I've got one PS2 with a Magic 3.1, and one with a DMS3. They both play GT4 with no problem, but i'm going to try a backup of it on DL media in a few days. What are the chances that the Magic 3.1 PS2 will run the backup?
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