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Parkinson's Law of Data

Parkinson's Law of Data: prov. "Data expands to fill the space
   available for storage"; buying more memory encourages the use of
   more memory-intensive techniques.  It has been observed over the
   last 10 years that the memory usage of evolving systems tends to
   double roughly once every 18 months.  Fortunately, memory density
   available for constant dollars also tends to double about once
   every 12 months (see Moore's Law); unfortunately, the laws of
   physics guarantee that the latter cannot continue indefinitely.