FAT

The primary file system used in the vast majority of PCs is FAT. This name actually stands for file allocation table, which is one of the main logical structures that the file system uses, so it's not the best name to refer to the whole file system. FAT is used by most DOS or Windows-based PCs. It is sometimes called FAT16, in reference to its 16-bit nature, to avoid confusion with its successor, FAT32.

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