PS2 games are actually pressed DVD/CD discs, they are not burned. PS2 games use the Burst Cutting Area (BCA) of the disc to identify themselves to the PS2 unit. The BCA is not part of a disc that you can burn on, it is only replicated on pressed discs.
So, the only way to play backups is to get boot-discs or a mod-chip.
Use Quality Media I use
Verbatim dvd+r
***** BURN AT NO MORE THAN 4X****** <-----------(IMPORTANT)
TURN OFF ANY BACKGROUND APPLICATIONS
1. Take the ps2 game put it in the dvd rom or dvd burner, your choice.
2. open the dvd decryptor program then go to to tool bar and hit MODE>ISO>READ. Then choose the correct dvd drive that the game is in as the "source". Also choose where you want the files to be stored on the pc hdd. THEN CLICK DECRYPT , or the huge graphical picture at the bottom of the program which makes it run. The game is now copying to your HDD. Take the game out when finished (it might take a while).
3. Go to the same tab in dvd decryptor and choose MODE>ISO>WRITE. This will then let you look for the files you just created in step 2. Select the file that you just created. (There is only 2 files created so pick the .mds) (The smaller file)Then click WRITE, make sure there is blank DVD in the drive.