The identification information for a filesystem object is known as its inode. Inodes carry information about objects, such as where they are located on disk, their modification time, security settings, and so forth. Each Linux ext3 filesystem is created with a finite number of inodes that is calculated based on the size of the filesystem and other options that are given to mke2fs (the command used to create an ext2 or ext3 filesystem on a partition). Multiple objects in the filesystem can share the same inode; this concept is called linking.

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