这帮助减少可能性的bug数：所有的子类被要求去做，满足了一个清晰的职责。

This helps to reduce the likelihood of bugs: all subclasses are required to do, is fulfill a clear contract.

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这些子类型的基本区别和命名的原因是磁盘上FAT机构目录项比特数的大小。

The basic difference in these FAT sub types, and the reason for the names, is the size, in bits, of the entries in the actual FAT structure on the disk.

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