1. Unit 1—Computer Basics
Lesson 5
Input, Output, and Storage

2. Computer Concepts BASICS -
Objectives
Identify and describe the most common input devices.
Identify and describe the most common output devices.
Identify and describe storage devices.
Identify and describe how input and output devices are connected to the computer.
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3. Input and Output Devices
Input devices enable a user to input data and commands to the computer to be processed.
Output devices enable the computer to give or show you the results of its processing.
Some devices can perform both input and output operations.
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4. Input Devices—The Keyboard
The keyboard is the most widely used input device.
As you press keys on the keyboard, an electrical signal representing that key is sent to the computer.
Keyboards are divided into sections.
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5. Input Devices—The Keyboard (cont.)
Typewriter keys: The standard alphabetic and numeric characters you would find on a typewriter
Function keys: Special keys that perform some specific function for the application being run
Numeric keypad: Used for mathematical operations
Directional keys: Used to move the cursor around the screen
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6. Input Devices—The Mouse
The mouse performs the following functions:
Pointing: Placing the on-screen pointer at a specific place
Clicking: Pressing and releasing the mouse button
Dragging: Holding down the mouse button and dragging an object to a new location by dragging the mouse
Double-clicking: Pressing and releasing the mouse button twice very quickly
Right-clicking: Pressing the right mouse button
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7. Other Pointing Devices (cont.)
Joystick and wheel: Joysticks consist of a metal or plastic handle mounted on a base that you can move in any direction to move the pointer or other object.
These typically are used for video games.
Most have buttons that can be pushed or clicked to control input/output.
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8. Computer Concepts BASICS -
Other Input Devices
Pointing stick: A pressure-sensitive device that resembles a pencil eraser; found mostly on notebook computers
Graphics tablet: A flat drawing surface connected to the computer
The user draws on the surface, and the figures or writing on the tablet can be input to the computer for processing.
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9. Other Input Devices (cont.)
Touch display: Screens that contain pictures or shapes that the user can press to input that data
Stylus/digital pen: Used with mobile devices to input data
Touchpad: Used mostly in laptop/notebook computers
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10. Other Input Devices (cont.)
Audio/voice input: Inputting sound and/or voice
These usually require a microphone and special voice recognition software to be installed on the computer.
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11. Other Input Devices (cont.)
Scanners: Devices that can convert a graphical image into a digital image and input it to the computer
Types of scanners include
Image scanners for scanning images and text
Bar code scanners to read product bar codes
Magnetic scanners to read the magnetic strip on a credit card
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12. Other Input Devices (cont.)
Digital cameras: Used to take pictures and store them on a magnetic disk instead of on film
Their images can be input directly into the computer.
Video input: Input from a camcorder or VCR using video capture cards
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13. Other Input Devices (cont.)
Biometric input: Uses fingerprint, face, handwriting, and voice for identification
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14. Which of the following is NOT a computer input device?
Mouse
Keyboard
Printer
Microphone
Countdown 10
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15. Magnetic Storage Devices
Floppy disks: Small, portable disks that hold a limited amount of data
Hard disks: Large-capacity and fast-access storage devices
Zip disks: Auxiliary storage devices that can hold large quantities of data and can be portable
Magnetic tape drives: Used for making system backups and storing large quantities of data
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16. Optical Storage Devices
CD-DA: Audio CD
CD-R: This drive allows you to read and to write to a compact disk
CD-ROM: Can hold large amounts of data, but is read-only access
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17. Optical Storage Devices (cont.)
CD-RW: Can be written on several times
DVD-ROM: Read-only DVD format
DVD-R: Similar to CD, but holds more data; read-only
DVD-RW: Can be written on several times
Blu-ray: High capacity DVD
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18. Solid-State Storage Media
Non-volatile removable media
Miniature mobile media
Uses integrated circuits
USB flash drive
Connects to the computer via a USB port
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19. Computer Concepts BASICS -
The “Cloud”
Data is stored on a remote server
Initial space is often free with upgrades for a fee
Examples: Google Drive, iCloud, SugarSync, Amazon EC2, Microsoft
Advantages & Disadvantages
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20. Caring for Storage Media
To safeguard your data from damage, follow these tips when dealing with removable media:
Keep away from magnetic fields.
Avoid extreme temperatures.
Remove media from drive when not being used.
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21. Caring for Storage Media (cont.)
Tips for dealing with storage media (cont.)
Hold optical disks at their edges.
Never remove the media from the drive if the access light is on.
Use “Safely Remove Hardware” icon before ejecting USB devices
Keep disks in a sturdy case when transporting them.
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22. A DVD is classified as what type of storage?
Optical
Magnetic
Solid state
Countdown 10
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23. To which of the following could you write data multiple times?
DVD-ROM
CD-RW
CD-R
CD-DA
Countdown 10
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24. Output Devices—Monitors
Monitors are used to display video output to a user.
Monitors may be monochromatic or color.
Monochromatic monitors display output in a single-color display.
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25. Output Devices—Monitors (cont.)
Factors that influence the quality of a monitor
Screen size: The diagonal measurement in inches of the display area
Resolution: The number of pixels that can be displayed in the display area
Dot pitch: The distance between each pixel in the display area
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26. Typical Computer Monitor
This figure shows a typical computer monitor on a swivel stand that can be adjusted for viewing comfort.
LCD
Gas plasma
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27. Output Devices—Printers
Printers are used to create a hard copy of a document or image.
Printers vary by speed, quality, and price.
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28. Output Devices—Printers (cont.)
The most popular types of printers are
Laser: Produce images using the same techniques as copier machines
Ink jet: Use fine nozzles to spray ink onto the page as the paper passes through
Dot matrix: Work similarly to a typewriter in that ink is transferred to the paper by some part of the printer striking a ribbon to transfer an image
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29. Computer Concepts BASICS -
Laser Printer
This figure provides an overview of a laser printer.
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30. Computer Concepts BASICS -
Ink Jet Printer
This figure provides an overview of an ink jet printer.
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31. Other Types of Output Devices
Speakers and headsets
Fax machines and fax modems
Multifunctional devices
Contain a variation of output options
Data projectors
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32. Which of the following is NOT an output device?
Printer
Modem
Scanner
Speaker
Countdown 10
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33. Connecting I/O Devices to the Computer
Input and output devices must be connected to the computer before they can be used.
Connecting I/O devices to the computer:
Plug the device into an existing socket or port on the back of the computer.
Install an expansion card with the port you need included on the back of the card.
Connect wirelessly.
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34. Computer Concepts BASICS -
Summary
Input devices enable you to input data and commands into the computer.
The most common input devices are the keyboard and mouse.
Other types of input devices include trackball, joystick and wheel, pointing stick, graphics tablet, touch display screen, stylus, voice recognition devices, touchpad, scanner, digital camera, video input, and biometric input.
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35. Computer Concepts BASICS -
Summary (cont.)
To maintain a permanent copy of data, you should store it on some type of storage medium.
The three categories of storage media are magnetic storage, optical storage, and solid-state storage.
Monitors and printers are examples of output devices.
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36. Computer Concepts BASICS -
Summary (cont.)
Monitors produce soft copy.
Printers are used to produce a paper or hard copy of the processed result.
Criteria for selecting a printer include speed, print quality, and cost.
Input and output devices must be physically connected to the computer.
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37. Computer Concepts BASICS -
Summary (cont.)
Some input devices communicate with the computer through a physical connection.
Wireless devices communicate with the computer through infrared or radio waves.
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