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Why is it that advertised disk space is almost always higher than the disk space reported by the UI? For example, I have an "80 gb" hard drive, but the iTunes UI indicates only 74. I usually see this as well with hard disks and the amount reported with the drive letter.
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It's the way the OS calculates free space vs the hard drive manufacturers.
OS: 1mb = 1024 kb
Vendor: 1mb = 1000 kb
The vendor will always use the *1000 to increase their numbers.
It's the difference between the standard (SI) prefixes (giga, mega, kilo, etc.) which are multiples of 1000 and the binary prefixes which are multiples of 1024.