Recently, I was thinking about getting an external hard drive and
I saw one on sale at staple. It was a 1 TB portable HD; I wanted to buy it, but
before that I want to make sure f its spec and that is why I was online looking
for some basic review or thought on it. Then I came upon one of the comment and
it talked about how he/she got rip off because his TB HD was in fact and 930
GB. Then I was thinking to myself, I wonder how many people don’t know that? So
here I am talking about it:

When you buy a TB HD, they did not
rip you off. There are in fact Tera (1,000,000,000,000) PHYSICAL Bytes. That is
important because computer think in binary(0 and 1), that is only two values
and if they want to calculate with bigger number, they add another
digit in front of it(once again, a 0 or 1) just like how we add
another digit in front when we hit 9. In that way, we calculated as 10^X and
computers as binary is 2^X. If you don't see it yet, there is not integer (whole
number, no decimals) value of X for 2^X will produce 1000. The closest is 2^10,
which is 1024, then the computer calculated the amount of TB by dividing
1024(instead of 1000 because of how data are store in computer) and so it end
up with ~930 GB in total. The one who sold it to you did not lie, but they
did omit the most important information.

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