Consider the following disk request sequence for a disk with 100 tracks 54, 25, 76, 85, 10, 50, 77, 43, 61, 21. Head pointer starting at 30 and moving in left direction. 1) Find the number of head movements in cylinders using C-Scan scheduling. 2) Find the number of head movements in cylinders using C-Look scheduling.

There is sequence of disk track requests: 75, 62, 99, 144, 50, 162, 110, 26, 198. Assume that the disk head is initially positioned over track 100, and is moving in the direction of decreasing track number. For SCAN algorithm A)What is the tracking order? B) What is Average Track Length?

d) Provide a block diagram of a register file that uses a 2-to-4 decoder to read from and write to the registers. This block diagram can be used to write a VHDL entity of this memory.

Consider a single-platter disk with the following parameters: rotation speed:7200 rpm; number of tracks on one side of platter: 30,000; number of sectors per track: 600; seek time: one ms for every hundred tracks traversed. Let the disk receive a request to access a random sector on a random track and assume the disk head starts at track 0. a. What is the average seek time? b. What is the average rotational latency? c. What is the transfer time for a sector?