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