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Boy that sure was a confusing post from manning. The discussion of gigabits is of course a total red herring. So is the discussion of pre/post formatting. The issue is simple, is a megabyte 10**6 or 2**20. 810 * 10**6 = 772 * 2**20 so depending on your definition of megabyte, the same disk can be described as either 810 megs (the IBM description), or 772 megs (using the dfefinition of megabyte that is always used when talking about computer main memory, i.e. 2**20). On thing I will say in IBM's case is that every IBM ad I ever saw has a footnote explaining the usage. In most ads for disks, you simply cannot tell which definition of megabyte is being used.