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The remainder of the filesystem, after the root directory, is known as the files area, and is the same for all versions of the dosfs filesystem type. The disk sectors in this area are viewed as a pool of clusters, each containing one or more logically consecutive sectors, depending on the disk format.
Because the first two fields of the FAT are reserved, the first cluster in the files area is assigned the number 2. If the filesystem is a bootable system disk, the first clusters of the files area are allocated sequentially to the files containing the MS-DOS BIOS and the DOS kernel, thus keeping the complexity of the disk bootstrap program to a minimum.