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sys. throughput total tracks swept avg. tracks swept per R/W req. avg. turnaround time of I/O req demo1 demo2 demo3 demo4 demo5 6.2748 6.4482 6.4497 6.2995 5.1500 27454 34833 30872 32685 36208 11.5256 11.9332 11.0297 11.6774 12.4941 The differences in the runs from 2 to 5 are due to a combination of factors including process I/O requirements, I/O seek time, and time spent waiting in the ready queue. For example, the average number of tracks swept for demo5 was the highest resulting in a higher turnaround than say for demo3, which had the shortest average number of tracks swept and consequently the shortest turnaround time.