HP All-in-One 200-5000 - Desktop PC, Quick Start Manual

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Understanding hard disk drive space
The hard disk drive on the Hewlett-Packard and
Compaq computers with the Microsoft®
Windows operating system preinstalled may
appear to be smaller than the size stated in the
product specifications, in the documentation, or
on the box. Hard disk drives are described and
advertised by manufacturers in terms of decimal
(base 10) capacity. Microsoft Windows and
other programs, such as FDISK, use the binary
(base 2) numbering system.
In decimal notation, one megabyte (MB) is equal
to 1,000,000 bytes, and one gigabyte (GB) is
equal to 1,000,000,000 bytes. In the binary
numbering system, one megabyte is equal to
1,048,576 bytes, and one gigabyte is equal to
1,073,741,824 bytes. Because of the different
measuring systems, you may see a difference
between the size reported by Microsoft
Windows and the size advertised. The storage
capacity of the hard disk drive is as advertised.
Microsoft Windows reports smaller capacity in
the Windows Explorer tool and in the computer
window because it shows information about one
partition on the hard disk drive at a time. One of
the partitions contains the System Recovery
information.