Leave yourself a bit of headroom, Bob, and create a 76GB partition or so. The 74.41 is because drives are advertised as "Billion Bytes", as opposed to actual "GigaBytes", which are in multiples of 1024, not 1000.
Marketing.
Anyway, your partition need only be as large as your largest anticipated data storage, plus about 20%...
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--Dave Nanian
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