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What does I/O stand for?

What the difference between file I/O and block I/O? What does I/O stand for? Information object?

See What is block I/O? for the difference between file and block I/O. I/O stands for Input and Output, which in the case of disks means reading and writing -- inputting data or outputting data. The term I/O was originated when data processing was done with punched card decks.

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