Why does every directory have a size 4096 bytes (4 K)?

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http://askubuntu.com – As the subject says; I want to know why is every directory having a size equals to 4K even if they contain files with sizes greater than 4K. Please have a look at the following:- a) b) PS: I am aware of 'du -sh' command line utility. edit: I am assuming directory as a container for files. (HowTos)