Difference between primary and secondary memory.

v What is the difference between primary and secondary memory.

PRIMARY MEMORY	SECONDARY MEMORY
1)      It is semiconductor memory.	It is magnetic and optical memory.
2)      It is faster and expensive than secondary memory.	It is slower and cheaper than primary memory.
3)      Primary memories are smaller in size.	Auxiliary memory is larger than primary memory.
4)      Its storing capacity is small.	Secondary memory is permanent.
5)      Processor directly access main memory.	Processor does not access directly secondary memory.
6)      Example: RAM, ROM.	Example: CD, DVD, CD-R, CD-RW etc.