A NEO+G disc is a DVD containing a single RSQ NEO+G library. The DVD can be single- or dual-layer. Since data files in a NEO+G library are fixed in size at 1GB there can be four data files (and about 1000 tracks) on a single-layer DVD, while a dual-layer DVD can hold eight data files (and hence about 2000 tracks).
When you create a NEO+G library using CDGFix 3 Super you must select the number of data files based on the media you intend to burn the finished library onto. See the topic NEO+G libraries for details on how to create a NEO+G library and for more information regarding number of data files and tracks.
When you create a NEO+F library for use with NEO+G players you must make sure you name the library index file NAVI.IFO. When the library is finished simply use a burning software of your choice and burn the NAVI.IFO file along with the data files (NCDG_01.DAT, NCDG_02.DAT, etc.) onto the root of the DVD. The NEO+G disc should not contain any folders, only the library files.