a$)$ Consider a double$-$side$-$platter disk with the following parameters: Rotation speed: $7550$ rpm; Number of Tracks on one side of platter: $2550$; Number of sectors per track: $128$; Seek time: four 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 $0.[8$M$]($i$)$ Draw the layout structure of Disk.$($ii$)$ Find the capacity of the disk.$($iii$)$ Determine the average seek time?$($iv$)$ Determine the average rotational latency?$($b$)$ Illustrate the different RAID levels, and how do they differ from one another? $[6$M$]($c$)$ Calculate and compare the read and write performance of a RAID$-4$ and RAID$-5$ systems, suppose if we have $4$ disks, each with a capacity of $2$ GB$,$ data block size of $512$ MB$,$ parity block size of $256$MB and the write penalty is $4.[6$M$]$