If you want to tell if you have V2 or not, put in part II. Go to the scene towards the beginning after they first 'land' in the future and Marty is changing clothes. Notice the shot where Marty says his jacket doesn't fit. When Doc reaches over and presses a button on it, you SHOULD be able to see his sleeves "adjust". If it looks like nothing happened, you have the flawed disc.
In Part III, go to where Marty first arrived in 1885 Hill Valley. Notice the shot after Marty accidentally jumps in horse crap, where he stands there for a second and it sinks in his shoes are stinky. If the poo reaches the end of the black bar, then the rest is cropped and you have the flawed disc. But if the poop is well in view, you're discs are allright.