A superblock is a block on each filesystem that contains metadata information about the filesystem layout. The information contained in the block includes the type, size, and status of the mounted filesystem. The superblock is the Linux/Unix equivalent to Microsoft systems’ file allocation table (FAT), which contains the information about the blocks holding the top-level directory. Since the information about the filesystems is important, Linux filesystems keep redundant copies of the superblock that may be used to restore the filesystem should it become corrupt.

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