Hi there,
I am currently trying to copy the acura navteq dvd for the 2003 and the 2008. These are both dual layer disks and I have tried with dvddecrypter and it will rip an iso no problem - both dvddecrypter and
nero set to dvd-rom burnt the disk but it did not read correctly. However, when I use the disks in Nero set to dvd-rom and do a disk copy to dvd+R dl disks they perform correctly. I can use the 2008 copy in the 2008 MDX, and will have to test it in the 2003 TL. Versions of the disk that I am using are 2003 version 3.?? 2008 version 4.62 and 2008 version 6.2. The 6.2 disks are not working correctly and are giving me problems but the others are ok. Note I made about 5 copies with dvd decrypter and they did not work (even when set to dvd-rom mode), only nero copies worked...
Your idea of spliting the disk might work as long as you split the map files between the two. I have not looked at the disk too closely yet.