Macintosh Hard Drive capacity less than its supposed to be?

Hello.
I just bought a Macbook pro 13" (2010) and I noticed that for example a file that on a dvd a usb or a pc hard drive is 700 MB, when I transfer it to my Macbook Pro's HD it suddenly takes around 735 MB. It happens with all the files so far that Iv transfered so far.
Also I noticed that if I'm going to burn a folder from my Mac HD that apparently weights, for example 1000 MB, to a dvd, when I actually burn it it ends ups weighting only about 900 MB on the DVD.
*It seems that files on my Mac HD weight more that they actually do, thus it seems as if the 250 Gygas my HD has are actully just like 200 Gygas.**
Is this normal, does it also happen to you guys??
Thanks.

Hi DanielSarmiento,
It sounds like it's the whole 1024MB = 1.0GB differential, aka base 10.
http://lifehacker.com/5349204/snow-leopard-reports-hard-drive-capacity-correctly -in-base-10

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