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inodes (index nodes) are data structures used to store metadata for each file on a Unix/Linux filesystem. inodes typically contain information about the file's permissions and creation, access, and modification times. The number of inodes on a filesystem is set at the time it is created and often cannot be changed; because each file uses at least one inode, the number of inodes available ultimately limits the number of files which may be stored on a filesystem, regardless of their size.

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