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Consider a system in which DMA technique is used to transfer 16 MB of data from an I/O device into memory. The bandwidth of I/O device is 128 KB/s. What percentage of time is the CPU in busy mode (approximately)?

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Explanation:
Time taken by I/O device = 16 MB128 kB=128 sec
Percentage time CPU is busy = 128128+28×100=82.05

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