There are various categories under which storage devices can be classified;

1. The duration they store information;
2. Mobility and;
3. How they function.

Storage devices in this category can either be;

1. Secondary storage devices
2. Primary storage devices

Storage devices can also be categorized according to mobility. I.e.

1. Fixed storage devices and;
2. Portable storage devices

Storage devices functions in different ways depending on the technology used to manufacture each one of them. They include;

1. ​Solid state storage device
2. Magnetic storage device
3. optical storage devices

This is an electrostatic technology powered printer that uses  a laser beam of light to create characters on a piece of paper.

These are devices that enter data into a computer and also covert data from human readable form to machine readable form.
Examples of these devices include: 

1. Keyboard/Keypad
2. Mouse
3. Trackball
4. Scanner
5. Digitizer
6. Whiteboard
7. Digital camera
8. Joy stick

The CPU-Central Processing Unit is a device made from a collection of integrated circuits. Its main functions are:

1. Manipulate numeric and logic data (A.L.U - Arithmetic & Logic Unit)
2. Coordinate processing activities (Control Unit)
3. Provide temporary storage (Registers, buffers and caches)

These are devices that provide temporary storage for task that are to and from processing. They include:

1. RAM - Random Access Memory
2. ROM - Read Only Memory
3. Logical Drives: These are hard disk partitions that behaves like a RAM once that memory in the RAM has been fully utilized.

These are devices that permanently store data in the computer or they are portable. They include:

1. Fixed Storage Devices
   1. Magnetic
      1. The Hard Disk
2. Portable Storage Devices
   1. Solid State Storage Devices
      
      1. Memory card 
      2. Flash Disk
   2. Magnetic storage devices
      1. Magnetic tapes
      2. Floppy disks
      3. Zip disks
      4. Magnetic tape
   3. optical storage devices
      1. Compact disks (CD)
      2. Digital Versatile Disks (DVD)

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These are devices that display activities in the CPU to the user and converts information from machine readable form to human readable form. These devices include:

1. Hard Copy
   1. Printer
   2. Plotter
2. Soft Copy
   1. Screen/Monitor/VDU
   2. LED - Light Emitting Diode
   3. Sound Output (such as speakers)

Printing multiple copies implies that two or more papers are printed at the same time by only one printer. This is only possible by the use of impact printers such as a dot-matrix and a daisy wheel printer because they have special hammers that produce characters on a piece of paper. And behind every paper, there is a coupon copy that produces characters on another paper.
This type of printing is majorly done where monetary transactions are carried out such as a bank.
For example; when paying school fees through a bank, the bank produces three copies of receipts (whitish, blueish and pinkish) in color. One copy for the bank, another for the school and the last one for your own records. To produce these receipts (vouchers/slips), the bank prints them in multiple copies using impact printers.

Printing multiple pages is a situation where printers automatically make characters on a piece of paper (one paper at a time) but automatically pulls the next paper in a series once the current is over, this process repeats until the printing task is accomplished.
Printing multiple pages depends on the printing mechanism of the printer. There are those printers that can only print one side of the page at a time and others reverse the page to print on the other side. It is called back to back printing. Any type of printer can handle multiple page printing, however the desk-jet printer and laser-jet printers are preferred for this job because of their printing speed.

​To effectively establish the difference between system software and application programs, we should define the two.