List the difference between static RAM and dynamic RAM. Discuss the Memory Hierarchy in computer system with regard to Speed, Size and Cost. Write a short note on magnetic disk, magnetic tape and optical disk. Consider a cache consisting of 256 blocks of 16 words each for a total of 4096 words and assume that the main memory is addressable by a 16 bits address and it consists of 4K blocks. How many bits are there in each of TAG, SET, WORD field for 2-way set associative technique ? Define Virtual memory? Define HIT and MISS ratio in memory with an example.