An early version of UNIX was developed for small PDP-11 computers without memory management hardware. It held only one process in memory at a time; a swap was needed on each context switch. An early disk drive for such systems was the RL01. This drive took 55 ms to seek to access the data, and that data could be transferred at a rate of 512 KB/S. If each process was 32 KB in size and the quantum was 0.3 S, what fraction of the time was the system doing useful work? Assignment description: This assignment includes four tasks as following: Task1: Analyze the performance of HDD (hard disk drive) and SSD (solid-state drive) in terms of speed and cost. Task2: Assume the following statement that will be performed by computer system: Z = a+b Discuss the process taken by a computer processor to execute the above instruction and store the result. Task3: Given the following statement: short int X, Y, Z; where short int size is 16 bits. Identify the problem that may occur during the execution of the following operation? Explain your answer. X=400; Y = 400; Z=X*Y; Task4: Assume that you have a computer system with the following specifications: A processor with 64-bit word size. RAM with size 16GB Answer the following questions: Question1: How many read operations are needed to perform a *b, where a and b are variables of size 32 bits each. Question2: Compute the width of the address and data bus considering RAM and processor. Question3: What is the Data Transfer Rate (Bus Capacity) where the data transfer unit is 16 bits and the bus cycle time is 0.3 nanoseconds