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The Data Cache Size is the size of the memory buffer used to store random data. On the Evaluation Edition, this value is limited to 4096 bytes. On other versions the value can be set much higher for better performance.
The Save Unused Data allows generated data in the buffer to be saved on exit. The next time the program is started, the buffer will automatically be populated with the saved data. For large buffer sizes, this means less waiting for numbers after a reboot.
The Write to Disk option causes the data to be written to the RANDOM.DAT file when the memory buffer is full. Data saved to the file is removed from the buffer so that generated data is not reused in both places. On the Evaluation Edition the size of the RANDOM.DAT file is limited to about 80K. On other editions the size of the RANDOM.DAT file is limited to about 16 times the size of the memory buffer. Checking and unchecking this option will clear the RANDOM.DAT file and start a fresh file.
