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- Calculate the access time for a disk having the size of 512 byte/sector and the seek time of 12ms. The rotational rate is 5700 RPM. The data transfer rate is 3MB/sec, and the the controller overhead is 1ms, you may even assume that there is no service time for the access.Suppose that a magnetic disk has an average seek time of 4 ms, a rotation rate of 5400 RPM, a transfer rate of 50 MB/second, a sector size of 512 bytes, and controller overhead of 2 ms. What is the average amount of time to read a single sector?A program repeatedly perform the 3steps process: it reads a 4KB block of data from disk, does some processing on the data and then writes out the results as another 4KB block elsewhere on the disk. Each block is contiguous and randomly located on a single track on the disk. The disk drive rotates at 10000RPM, has an average seek time of 8ms, and has a transfer rate of 50MB/sec. The controller overhead is 2ms. The processing step tales 20million clock cycles and the clock rate is5 GHz. What is the overall speed of the system in blocks processed per second?
- What is the average time to read or write a 512 bytes sector for a disk? The advertised average seek time is 5 ms, the transfer rate is 40 MB/sec, it rotates at 10,000 RPM, and the controller overhead is 0.1 ms. Assume the disk is idle so that there is no queuing delay. In addition, calculate the time assuming the advertised seek time is three times longer than the measured seek time.We pointed out that I/O buses do not need separate address lines. Construct a timing diagram similar to Figure 7.11 that describes the handshake between an I/O controller and a disk controller for a write operation. (Hint: You will need to add a control signal.)A disk size of 200 tracks receives the requests for the blocks for I/0. operation. No. of blocks requested on disk are: 92, 154, 47, 31, 173, 74, 87, 23. Calculate the total head movements using FCFS and SSTF algorithms. Initially, the head pointer is at 53.
- The hit rate of the memory closest to the ALU is increased from 75% to 80% in a practical cache memory hierarchy. The hit latency (or hit time) for the closest memory is 20ps, while the miss latency is 20ns. What would the expected reduction in the average memory access latency be?Define the process of using VM to provide page-level memory protectionOne buffer is for the driver to store the data while waiting for the higher layers to read. Explain what is buffering and state ( THREE ) 3 different between input buffering and output buffering.
- Q: If data is to be sent from an input device to a memory buffer starting at address A000H and ending at AFFFH, provide the mode byte for DMA channel 2. Check that p is not totally disconnected from the bus throughout the DMA cycle. Furthermore, the channel is to be reinitialized at the conclusion of each DMA cycle such that the same buffer is filled when the next DMA operation is initiated?What is the average time to read or write a 512-byte sector for a typical disk rotating at 15,000 RPM? The advertised average seek time is 4ms, the transfer rate is 100 MB/sec, and the controller overhead is 0.2ms. Assume that the disk is idle so that there is no waiting time. 512B sector, 15,000rpm, 4ms average seek time, 100MB/s transfer rate, 0.2ms controller overhead, idle disk(True/False): CMOS RAM is the same as static RAM, meaning that it holds its value without any extra power or refresh cycles.