I have always been led to believe that SwapMagic discs only work if they are orginals, not downloaded as they work by having information in areas of the CD that burners cannot burn to. This is how PS1s and PS2s check if a disc is an proper PS one.
For swap magic, you need to purchase an original copy i recommend from: and you cant burn swap magic onto a cd/dvd and make it work on a ps2 unless the ps2 is chipped! with swap magic, no modding neccasery so warranty is still intact! hope it helped!