(6 marks) c) A hard disk spins at 6000 rpm (revolution per minute), and it takes 100 us (on average) for the head to traverse one track. Consider the following sequence of disk track requests: 27, 129, 110, 186, 147, 41, 10, 64, 120. Assume that initially the head is at track 30 and is moving in the direction of decreasing track number. Compute the time it takes to serve the requests using FIFO SSF (shortest seek first) and SCAN (elevator) algorithms. (10 marks)