SECONDARY MEMORY

1. The most common form of secondary memory are hard disks, diskettes, tapes, and CD-ROMs.
   
   
2. They operate at much slower speed than the main memory.
   
   
3. Information stored is permanent (non-volatile) until they are re-written.
   
   
4. They are much cheaper (in terms of dollar per mega-byte) than the main memory.
   
   
5. A computer typically has much more secondary memory than main memory.