this is for RayLighting, and any others out there having a problem with loading SA the the first few times...
i dont know if this will work for u but it did/does for me. here we go:
1. have the game in ps2 and have it on the loading screen or whereever it says the format is wrong
2.hold down the blue (eject) button then pretty much stright after that (keep blue held down) and then hold down the green (reset) buton. which should turn off the ps2.
3. Straight after that, turn the ps2 back on.
i hope this helped, as i said it works for me and my DUO2 on a Datastream DVD+R. so dont complain if it doesnt work for u
have fun!