I have a few 2-disc DVD's which were created before I owned a DL drive.

I'd like to "re-burn" these onto a single DVD-9 DL disc, but don't know how to start. I can copy the contents of the two separate discs into two separate folders (can't really copy to the same folder because of duplicated filenames).

I'm assuming I'd need to rename the files from disc #2 so that they wouldn't conflict with like names from disc #1? My goal is to make a seamless transition so that it would all flow together when watching from the new DL disc.

Is there a guide or tutorial online somewhere to get me started?