That site just adds to the confusion. �Technically 1 Gigabyte is
1,000,000,000 bytes, the Giga prefix meaning 'multiplied by 10 to the 9th
power (10^9)'. �Because the computer world works in binary, 1 Gigabyte has
come to mean 1,073,741,824 bytes (which is 2 to the power of 30 (2^30), a
round binary number.
To try to cut through the confusion, the International Electrotechnical
Commision (IEC) now recommends the use of the term 'Gibibyte' to refer to
2^30 bytes, though it has not gained particularly wide useage at present.
Meanwhile, memory sizes (including FLASH drives) tend to be measured in
Computer Gigabytes (or Gibibytes), simply because it happens to be easier to
make them that way. �However, hard disk drives are measured in true
Gigabytes (10^9 bytes) because the manufacturers can make them slightly
cheaper that way.
To answer the OP's point: 250 Gigabytes works out to just over 232
gibibytes, though the quoted size is usually a nominal size and indeed, the
OP's disk is a little larger.
http://en.wikipedia.org/wiki/Gigabyte
http://en.wikipedia.org/wiki/Gibibyte
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