What is the difference between primary & secondary storage device?

PRIMARY STORAGE DEVICES            SECONDARY STORAGE DEVICES

1.These devices are tempo-      1.These devices are permanent.
rary.                       
2.These devices are expensive.  2.These are cheaper.
3.These devices are faster,     3.These devices Computers via 
therefore expensive.            cables,and slow, therefore 
                                cheaper.
4.These devices have less       4.These devices have high 
storage capacity.               storage capacity.
5.These devices refer to RAM.   5.These devices refer to FDD