UNIT 1.3 Storage

UNIT 1.3 Storage

1. Secondary storage is needed on a computer as backup storage.

   • Secondary storage is also referred to as Auxiliary.
   • Secondary storage is a device that is not directly accessed by the CPU of the computer.
   • Secondary storage devices can be internal and external.
     • flash memory is an example of an external device.
       • a disk drive is an example of an internal device.
     • a disadvantage of using secondary storage is that it can get easily lost.
       • But one advantage of using secondary storage is that it is portable and mostly reliable.
   • Three types of different secondary storage are:
     • Optical - Reliable and data is lasered on.
       • Disk Drive - Portable and easy to carry, put onto a disk.
         • Flash drive - Portable, can carry from work place to work place.

2. Fetch, decode, execute are the 3 simple instructions to processing instructions.

   • MDR – address the next instructions.

3. Cache, ALU and the control unit are all parts of the CPU.

   • RAM and ROM are NOT part of the CPU.