Parkinson's Law of Data
"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.
[Jargon File]
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