To be honest I did a search of the net and copy and pasted that last post I made. There is a mistake in it. It should be : "Please note DVD-R and DVD+R is not supported with the SBox. To Play DVD-R or DVD+R, please use an alternative chip such as the Neo2.5 or No-solder Mod."
So if you are trying to run a backup game on DVD in your PS2, this method of mod chip wont work..... Looks like this method will only play backup CDRs.... I do not own one, but this is the info I gathered on the Internet.
"Respect our forum, other users, and our staff.... have a good time!"