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The Memory Card is a saving unit used for the Nintendo GameCube. The amount of memory in a Memory Card is measured by 'blocks.' It takes 57 blocks to open an Animal Crossing save file, 1 block for NES saves, and 1 block to receive a special letter, containing two NES Games and one K.K. Slider song.
When Animal Crossing is bought new, a special 59 block Animal Crossing memory card comes with it.