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3 of Disks: Memory
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In computing, disks represent the technological substrate that the mathematics, or the logic, or music of computing depend. Disks are hard realities. The three of disks is represents one of those basic realities, memory. A computer program needs memory to run, and memory is finite.
The finitude of computer memory means every program must decide what to keep and what to throw away. The same piece of computer memory can be used for different purposes at different times. A critical operation for programs is preserving memory for future use by forgetting.
What are the states of your system? What is preserved too long, or not long enough? What are you trading for time and speed? Is the trade worth it?