On my new HD box it says 1GB = 1 billion bytes. I thought there were 1024k in a kb, 1024kb in a mb, and 1024 mb in a gb. So a gb should be 1,073,741,824 bytes not 1,000,000,000. Which is right? Are there two ways of measuring the same thing? Maybe this explains why my 250gb HD only shows as 243gb capacity in disk management. Wonder why they are allowed to exaggerate the size so much; 7gb is quite a significant amount of "rounding".