C
ChUIMonster
Guest
20 is a "rule of thumb" that basically boils down the various block and record overhead into single number. It is not terribly scientific but, in my experience, it works well. As George points out -- there isn't much value in calculating the value out to N decimal places when you're just going to round up to a power of 2. There are kbases, white papers and spreadsheets floating around that will tell you how to do that if you feel really compelled. But IMHO there is simply no value in doing so.
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