Assume a disk with the following characteristics:Number of sectors per track = 2

Assume a disk with the following characteristics:Number of sectors per track = 20Number of tracks per surface = 50Number of surfaces = 2 (called a double-sided disk)Number of characters per sector = 1024Arm movement time = 0.4 msec to move 1 track in any direction Rotation speed = 2400 rev/min1. How many characters can be stored on this disk?2. What are the best-case worst-case and average-case access times for this disk? (Assume that the average eek operation must move 20 tracks.)3. What would be the average case access time if we could increase the rotation speed from 2400 rev/min to 7200 rev/min?4. Defragmenting a disk means to reorganize files on the disk so that as many pieces of the file as possible are stored in sectors on the same track regardless of the surface it is on. Explain why efragmentation can be beneficial.