external harddrive question?

sportsmaniac095

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Hey
i have my macbook which has 160 gb total and i wanted to upgrade it without voiding the warranty so i am thinking about getting an external harddrive, but i have a really important question. If i get for example a 320b external harddrive, will i now have 480gb harddrive space or will i just have 320gb? (like do externals add on to your computers hdd?)
thx
 
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