The original PlayStation Memory Card, and most third-party offerings, use the same 15-block structure to represent the amount of space available. In actuality there is a hidden 16th block that defines the filesystem for the other 15 blocks and interfaces with the game’s code when writing and reading to or from the memory card. While most games were able to save all of their relevant data to a single block it was possible for larger or more ambitious games to require more space. Some games even required a full memory card just to save a single game.
Some examples of games that reserve a full 15-block memory card include A-Train, The City of Lost Children, and HeXen, among others. Civilization II and Fighter Maker are two other examples that require over 10 blocks in order to save their progress. You can read more about the technical specifications of the PlayStation Memory Card at consolemods.org.
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