Hard drive memory in macbook pro

I have recently purchased a macbook pro with a built in 250G hard drive. the product sent to me only has 232 GB - does this mean that the machine i have has 20GB of bad sectors that have been blocked out? what is the expected true amount of memory i should expect

Hi Zeid Mohamedali: Perfectly normal numbers for a hard drive. Check out this Apple article for the explanation. http://docs.info.apple.com/article.html?artnum=30065
Enjoy
Stedman

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