[Windows 8] Memory and Disk capacity are not corresponding.
How a memory is display
Windows displays memory smaller than the actual size.
This happens because some memory may be used for graphics, or the system
may reserve some spaces for future needs.
For example, 1GB (=1,024MB) memory can be displayed as 1,022MB or less.
How a disk capacity is displayed
A storage (HDD, SSD) device displays its capacity based on the calculation
method of 1KB=1,000 Bytes, while OS (Windows) uses a different method,
such as 1KB = 1,024 Bytes. Therefore, the memory displayed in Windows may
be smaller than the actual size of HDD.
This is due to the difference in the calculation method.
Also, it could be due to functions or hidden software, such as Recovery Solution.
Example : 80GB HDD is displayed as 74.5GB in OS
(80x1,000x1,000x1,000 byte/(1,024x1,024x1,024) byte=74.505GB)
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