This tutorial applies to your hard disk before installing windows.
In windows xp
In windows 7
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1. Use the exact amount given in the list below. Don't worry if the size automatically changed when you enter the size just put it.
2. Normally continue your installation.
3. Wait until windows is fully installed.
4. Then check your hard disk if it is in exact size by right clicking it then properties. (see attachment below)
5G = 5,130
10G = 10,250
20G = 20,500
40G = 40,975
80G = 81,950
100G = 102,500
200G = 205,000
Note: Make sure to format your hdd using NTFS or else it won't work.