Question: Please explain the difference with the first and second screenshot. Need clarification in the term On the fly. The total cost on the first

Please explain the difference with the first and second screenshot. Need clarification in the term "On the fly". The total cost on the first screenshot includes 10 I/Os and in the second one the total I/O cost iis 3,200 I/Os. Can you please provide the answer for second screenshot and explain. On the second screenshot the 10 additional I/Os are not included because are not saved into the disk? Please provide a throughly explanation with definitions to understand this.
 Please explain the difference with the first and second screenshot. Need

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