Why is my hard disk size lesser than the actual size on PC

Sometime you might be wondering why hard disk size lesser than the actual size on PC.  Why is different from the manufacturer size on Windows OS. This article will help to know why hard disk size lesser than the actual size on PC.

REASON:
Hard disk manufacturers have a way of calculating the sizes of the hard disk which is different from that in Windows OS.

Read also: How to increase the size of hard drive partition

ILLUSTRATION
To a hard disk manufacturer:
1GB = 1000000000bytes
Therefore, taking for example:
A disk of size 250GB will  be:
250 000 000 000bytes/1 000 000 000bytes = 250GB
However, In windows:
1GB = 1024^3 = 1073741824bytes
Therefore, taking for example:
A disk of size 250GB will  be:
250000000000bytes/1024^3bytes = 232GiB

NOTE: the sizes you see in windows are known as Gibibytes but not Gigabytes. This is because Hard disk manufactures measure Hard disk sizes using the base 10 numerals whereas Windows OS use the Base 2 numerals
SAMPLES
HARD DISK MANUIFACTURES
IN WINDOWS
80GB
74.5GiB
120GB
111.76GiB
160GB
149.01GiB
250GB
232.83GiB
320GB
298.02GiB
500GB
465.66GiB
640GB
596.05GiB
750GB
698.49GiB
1TB
931.32TiB

This article will show  you how to know why hard disk size lesser than the actual size on PC

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