No it is not broken I just have not used it I will put it in my game cube tonight and see what it says. They usually show you on the card, I would not sell a broken card . And by the way it is quite possible fur someone to not have a game console anymore and still have a card I have ps2 controllers and games but no longer own a ps2 same with the Xbox
Your can tell how big the memory is by looking at the back of the card where it says "Nintendo Gamecube memory card" then it has a number, either 251 or 1019 after it...this is how many blocks it can save. The higher the number the bigger the memory.