5

1. Input, Output, and
Storage
What Kinds of Peripheral
Devices Would Suit Your
Needs?

2. ©2003 The McGraw-Hill Companies
What Peripheral Devices
Suit Your Needs?
Input DevicesInput Devices Output DevicesOutput Devices Storage DevicesStorage Devices

3. ©2003 The McGraw-Hill Companies
5.1 Input Devices
• Input device captures information and translates it into a form
that can be processed and used by other parts of your computer.
•Keyboards
•Pointing devices
•Game controllers
•Scanners
•Styluses
•Microphones
•Digital cameras
•Web cams
p. 5.130 Fig. 5-1
SimNet Concepts Support CD:
“Overview of Input Devices” and “Other Everyday Input
Devices”

4. ©2003 The McGraw-Hill Companies
Input Devices
• The keyboard is the most common input
device. Types of keyboards include:
• Wireless
• Multimedia and one-touch access
• Portable keyboards for PDAs
p. 5.131 Fig. 5-2
SimNet Concepts Support CD: “Keyboards”

5. ©2003 The McGraw-Hill Companies
Types of Input Devices
p. 5.131 Fig. 5-2

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Pointing Devices
• Pointing devices are mainly used to choose and
enter commands
• Pointing devices tend to have PS/2 connectors or
USB connectors
• PS/2 connector fits into a PS/2 port, which a small round
socket with small holes that fit the pins on the connector
• USB connectors fit into USB ports, and these are small
rectangular openings on the back or front of your computer,
or even on your keyboard or monitor
p. 5.131 Fig. 5-2
SimNet Concepts Support CD: “Ports and Cables”

7. ©2003 The McGraw-Hill Companies
Pointing Devices
• Various pointing devices are available
• Types of pointing devices:
• Mouse
•Mechanical mouse
•Optical mouse
•Wireless mouse
• Trackball
• Touchpad
• Pointing stick
p. 5.132 & P. 5.133 Fig. 5-3 & Fig 5.4
SimNet Concepts Support CD: “Mice”

8. ©2003 The McGraw-Hill Companies
Game Controller
• Game controllers are used mainly to play games
• Types of gaming devices
• Gamepads
• Joysticks
• Gaming wheels
• Force feed
p. 5.134 Fig. 5-5

9. ©2003 The McGraw-Hill Companies
Specialized Input Devices
• Other types of input devices include:
• Scanners
• Styluses
• Microphones
• Digital cameras
• Web cams
p. 5.135 Fig. 5-6

10. ©2003 The McGraw-Hill Companies
Scanner
•Scanner is a light sensitive device that helps you
copy or capture images, photos, and artwork
that exist on paper. Types of scanners include:
•Flatbed
SimNet Concepts Support CD: “Scanners”

11. ©2003 The McGraw-Hill Companies
Styluses
• Stylus is an input device consisting of a thin
stick that uses pressure to enter information
or to click and point
• Styluses are used with:
•PDAs
•Tablet PCs
•Graphics tablets
p. 5.135 Fig. 5-6

12. ©2003 The McGraw-Hill Companies
Microphones
• Microphones are used to
input audio
• Three main types of
microphones are:
•Desktop microphones
•Headsets
•Directional microphones
• Speech recognition is
increasingly being included in
application software

13. ©2003 The McGraw-Hill Companies
Digital Cameras
• Digital cameras are used to:
• Download images to a computer
• Post pictures to the Web
• Produce videos
• Resolution is measured in
megapixels
• Higher the resolution, better the
image quality, but the more
expensive the camera
SimNet Concepts Support CD: “Digital Cameras”

14. ©2003 The McGraw-Hill Companies
Web Cams
• Web cam is a video camera
that can be used to take images
for uploading to the Web

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5.2 Output Devices
• Output devices take information
within your computer and
present it to you in a form that
you can understand
• Main output devices:
– Monitors
– Printers
– Speakers
SimNet Concepts Support CD:
“Overview of Output Devices”

16. ©2003 The McGraw-Hill Companies
Flat Panel Display Devices
• Devices with flat-panel displays
• Tablet PCs
• PDAs
• Cellular phones
• Desktop computers

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Monitors
• CRTs
• Flat-panel displays
– Gas plasma
– LCD (liquid crystal display)
• Passive matrix
• Active matrix
– Called TFT (thin film transistor)
– Separate transistor for every pixel
p. 5.137 Fig. 5-9
SimNet Concepts Support CD: “Monitors”

18. ©2003 The McGraw-Hill Companies
Screen Talk
• Screen size measured as a diagonal line across the
screen – from corner to opposite corner
• Resolution the number of pixels displayed on the
screen (the higher the resolution, the closer together
the dots)
• Pixels (or picture element) dots that make up the
image on your screen
• Dot pitch is the distance between the centers of a
pair of like-colored pixels
• Refresh rate the speed with which a monitor
redraws the image of the screen, and is measured
in hertz

19. ©2003 The McGraw-Hill Companies
Printers
• Inkjet – most popular
– Makes images by forcing droplets
through nozzles
– Top speed is 20 pages per minute
• Laser
– Forms images using an
electrostatic process
– Prints between 3 and 30 pages per
minute

20. ©2003 The McGraw-Hill Companies
Printers - Cont
• Resolution of a printer is the
number of dots per inch (dpi) it
produces.
• Higher the resolution, better the
image, and usually the more
costly the printer

21. ©2003 The McGraw-Hill Companies
Printers - Cont.
• Multifunction printer:
• Scan, copy, fax, and print
• Can be either inkjet or laser
• Cost less than buying
individual units
• Take up less desk space
SimNet Concepts Support CD: “Printers”
p. 5.139 Fig. 5-11

22. ©2003 The McGraw-Hill Companies
Speakers
• A speaker is a device that
produces computer output as
sound
• Speakers are common
devices in computer systems
Examples include:
• Built-in speaker
• Two-device set speakers
• Surround sound speakers

23. ©2003 The McGraw-Hill Companies
I•Can: Use a Computer Without
Neck and Shoulder Pain
• Computer work can lead
to physical problems
• Ergonomics – deals with
reducing discomfort
• Should sit up straight at
your computer
SimNet Concepts Support CD: “Ergonomics”

24. ©2003 The McGraw-Hill Companies
Using Your Computer:
Ergonomics and Health
• Position your screen about the length of your
arm away so that you look slightly down at it
• Your elbows, knees, and hips should form
right angles
• Your back should be at a right angle to the
floor
• Rest your eyes by looking away from the
screen frequently

25. ©2003 The McGraw-Hill Companies
Using Your Computer:
Ergonomics and Health
• Stretch your shoulders, back, arms, and
wrists at least every 30 minutes
• Stretch your hands downward and backward
frequently
• Always listen to your body when it tells you
that you’re uncomfortable and do something
about it

26. ©2003 The McGraw-Hill Companies
5.3 Storage Devices
• Storage device stores information to be
recalled and used at a later time
• Storage device consists of:
•Storage medium
•Storage device
• Three major technology types for
information storage:
•Magnetic
•Optical or laser
•Flash memory
SimNet Concepts Support CD: “Storage Concepts”

27. ©2003 The McGraw-Hill Companies
Storage Medium Terms
– Byte
– Kilobyte (KB)
– Megabytes (MB)
– Gigabytes (GB)
– Terabytes (TB)
– Petabyte (PB)
– Exabyte (EB)
= 8 bits
≈ 1 Thousand Bytes
≈ 1 Million Bytes
≈ 1 Billion Bytes
≈ 1 Trillion Bytes
≈ 1 quadrillion Bytes
≈ 1 quintillion Bytes

28. ©2003 The McGraw-Hill Companies
Magnetic and Optical
Storage
p. 5.142 & 5.144 Fig. 5.13 & 5.16

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Magnetic Storage Devices:
Internal Magnetic Hard Disk
• Magnetic storage devices can be
either internal or external
• Internal magnetic hard disks are
fixed inside the system unit
• External magnetic hard disks are
portable
SimNet Concepts Support CD: “Removable Disks”

30. ©2003 The McGraw-Hill Companies
Magnetic Storage Devices:
Internal Magnetic Hard Disk
• Internal hard disk is a magnetic
storage device with
• One or more thin platters that store
information sealed inside the disk
drive.
• Read/write heads access the
information on surface
• Heads read information while copying
it from disk to RAM
• Heads write information when
copying it from RAM to disk

31. ©2003 The McGraw-Hill Companies
Magnetic Storage Devices:
External Magnetic Hard Disk
• External hard disks are
magnetic storage media which
are portable storage units that
you can connect to your
computer as necessary
• Great for backup storage devices
• Ability to transport your hard disk
from one computer to another

32. ©2003 The McGraw-Hill Companies
Hard Drives
• Long term storage system
and application software
• Operating system and
application software are
copied from the hard disk
to memory
• Capacity measured in
gigabytes

33. ©2003 The McGraw-Hill Companies
Floppy Disks and Zip Disks
• Removable magnetic storage
media come in two basic types:
– Traditional floppy disks
– Zip disks
• These storage media are useful
for:
– Storing files for backup or security
purposes
– Transferring files from one computer
to another

34. ©2003 The McGraw-Hill Companies
Removable Magnetic
Storage: Floppy Disk
• Floppy Mylar disk
– Housed inside a hard plastic
casing
– Thin, flexible plastic disk
• 3.5 inch floppy disks
– also called floppies, diskettes,
floppy disks
– Holds about 1.44 megabytes of
information
• High-capacity disks
– Zip® disk
p. 5.144 Fig. 5.15

35. ©2003 The McGraw-Hill Companies
Removable Magnetic
Storage: Zip Disk
• High capacity plastic platter disk
– Called removable hard disks
– Provide a higher storage capacity than Mylar
disks
• Example - Zip® disk with capacity of 100MB,
250MB, and 750MB

36. ©2003 The McGraw-Hill Companies
Optical Storage
• CDs
• DVDs
• Both are optical
storage and have
three formats:
– Read-only
– Write-once
– Read-and-write

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Optical Storage Media
• Read-Only
 CD-ROM
 DVD-ROM
• One-Time Writable
 CD-R
 DVD-R
 DVD+R
• Fully Read-and-
Write
 CD-RW
 DVD-RW or
DVD+RW or
DVD-RAM
SimNet Concepts Support CD: “CDs and DVDs”

38. ©2003 The McGraw-Hill Companies
Flash Memory Cards
• Flash memory cards have
high-capacity storage
laminated inside a small
piece of plastic
• Flash flash memory cards do
not need a drive with moving
parts to operate

39. ©2003 The McGraw-Hill Companies
Flash Memory Talk
• CompactFlash (CF)
• xD-Picture Card (xD)
• SmartMedia (SM) Card
• SecureDigital (SD) card and
MultiMediaCards (MMC)
• Memory Stick Media

40. ©2003 The McGraw-Hill Companies
Flash Memory Card Readers
• Some devices have flash memory slots
into which you slide your flash memory
card
• Other devices can use an external flash
memory card reader in order to transfer
information
• A flash memory drive is a flash memory
storage medium for a computer that is
small enough to fit in your pocket and
usually plugs directly into a USB port