I own a modded PS2 (fat) and I noticed that certain PSX games only run for me in certain speeds. For example, Persona Innocent Sin only worked with 10x, while Mortal Kombat only worked with 24x. I currently burn my Verbatim CD-Rs using a Mac SuperDrive and the speed options that it gives me are: 4x, 10x, 16x, 20x, 24x. However, going through trial and error for each disc is a pain, especially for multi-disc games. I have over 40 duds, which is a total waste of discs and money. Is there any sure-fire way of knowing which speed will work with any given disc?