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The size conversion used by Microsoft or any other OS out there is much different than the on used by HD makers. The size reported by the OS is the true size of the drive. HD manufacturers use the raw bits avalable and do a base 10 shift to determine the GB's of a drive. However this shift that the HD manufacturers use is incorrect due to the fact that 1024 bytes are a kilobyte, 1024 kB is a MB and 1024 MB is 1 GB. So when you acctually traverse from bytes to GB you can see the loss that occurs.
When you buy a drive that says that it is 80G is actually 80000000000 bytes which equates roughly to 74.4 as Elitegibson had previously mentioned.
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