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I/O is an acronym for input/output, which refers to the mechanism or process for the transfer of information between one system or component and another.

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It is not specific to Linux, and it is called the page cache (which Linux does quite well). See also http://linuxatemyram.com/; so if a file is written, then read again a few seconds later, very often …
answered Aug 20 '15 by Basile Starynkevitch