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number of disk units

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The average seek time and rotational delay in a disk system are 6ms and 3ms respectively.The rate of data transfer to or from the disk is 30Mbps and all disk accesses are of 8Kb of data.Disk DMA controller,the processor and main memory are all attached to a single bus.The data bus width is 32 bits and a bus transfer to or from the mein memory takes 10ns .How many disk units are there that can be simultaneously transfering data to or from the mian memory
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