Samsung NP900X4D-A04US - Manual (Page 6)

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Chapter 1
Getting Started
About the Product Capacity Representation
Standard
About the capacity representation of the storage
The capacity of the storage device (HDD, SSD) of the manufacturer
is calculated assuming that 1KB=1,000 Bytes.
However, the operating system (Windows) calculates the storage
device capacity assuming that 1KB=1,024 Bytes, and therefore the
capacity representation of the HDD in Windows is smaller than the
actual capacity due to the difference in capacity calculation.
(E.g. For a 80GB HDD, Windows represents the capacity as 74.5GB,
80x1,000x1,000x1,000 byte/(1,024x1,024x1,024)byte = 74.505GB)
In addition, the capacity representation in Windows may be even
smaller because some programs such as Recovery may reside in a
hidden area of the HDD.
About Memory Capacity Representation
The memory capacity reported in Windows is less than the actual
capacity of memory.
This is because BIOS or a video adapter uses a portion of memory
or claims it for further use.
(E.g. For 1GB(=1,024MB) memory installed, Windows may report
the capacity as 1,022MB or less)
Before You Start