Why memory card shows"less space" than advertised?

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Hi friends in this topic we will talk about "why memory cards shows less space than advertised?"
So many of you  using memory cards with different sizes.but some of you have small doudts like(showing less space 8gb =7.8gb)
If you ask this question to anyone soany people tell system reserved  but this is wrong answer.
I will say the actual answer
In English Kilo means one thousand (10001 = 1,000), a Mega is a million (1,0002 = 1,000,000) , a Giga is a billion (1,0003 = 1,000,000,000) and so on (Tera, Peta, Exa, Zetta & Toyya). This system is called the SI units system.

In Computer, however, the numbers are a bit different: A Kilo means 1,0241 = 1,024, a Mega is 1,0242= 1,048,576, a Giga is 10243 = 1,073,741,824 and so on. This is called the Binary units system.

Memorycards manufactures choose to use the SI system to denote cards sizes. Our computers and card readers use the binary system for size calculation and here is where the missing bytes are
System represent the memory card size in binary units that's why memory card shows less space(8GB=7.8GB).If the memorycards manufacturers choose to use the binary units to denote memorycard sizes,then memory card shows actual size as advertised.

Now you understand why Memory Card's shows less space...
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