Why is the capacity of a 4.7GB DVD on one side displayed as 4.38GB on the computer properties?

29 October 2021

In decimal notation, 1K = 1,000 is used for calculation, but on a personal computer, 1K = 1,024 (1,024 is 2 to the 10th power), which is convenient in binary notation.
Therefore, the difference becomes larger as it becomes K (kilo), M (mega), and G (giga) compared to the case of displaying in decimal notation on a personal computer. Therefore, if you check the capacity of the 4.7GB DVD in the properties of your computer, it will be 4.377GB (= 4,700,000,000 ÷ 1,024 ÷ 1,024 ÷ 1,024). Since this is a difference in display, there is a 10-digit byte display on the left side of the GB (or MB) display of the property, so this is the correct capacity.

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