I o device

INPUT, OUTPUT, AND
STORAGE DEVICES
What Kinds of Peripheral DevicesWould SuitYour
Needs?
Wednesday, May 01, 2013ARCHANA RAI

1. List and compare eight input devices.
2. Define and describe four types of pointing
devices.
3. Compare and contrast inkjet and laser
printers.
4. Define the three major technologies on
which computer storage is based.
ARCHANA RAI Wednesday, May 01, 2013

5. Describe the three classes of CDs and the
three classes of DVDs that are available.
6. List and describe five types of flash memory
cards that are available for electronic
devices such as computers and cameras.

In this chapter, we’ll discuss various input,
output, and storage devices designed to
meet the various needs and lifestyles of
people.
This chapter explores the features available
in these devices.

ARCHANA RAI
Input Devices Output Devices Storage Devices
Wednesday, May 01, 2013

• 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
ARCHANA RAI
SimNet Concepts Support CD:
“Overview of Input Devices” and “Other Everyday Input
Devices”

 The keyboard is the most common input
device. Types of keyboards include:
• Wireless
• Multimedia and one-touch access
• Portable keyboards for PDAs
ARCHANA RAI
p. 5.131 Fig. 5-2
SimNet Concepts Support CD: “Keyboards”

 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

 Various pointing devices are available
 Types of pointing devices:
• Mouse
Mechanical mouse
Optical mouse
Wireless mouse
• Trackball
• Touchpad
• Pointing stick
ARCHANA RAI
SimNet Concepts Support CD: “Mice”

 Game controllers are used mainly to play games
 Types of gaming devices
• Gamepads
• Joysticks
• Gaming wheels
• Force feed

 Other types of input devices include:
• Scanners
• Styluses
• Microphones
• Digital cameras
• Web cams
ARCHANA RAI
p. 5.135 Fig. 5-6

•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
ARCHANA RAI
SimNet Concepts Support CD: “Scanners”

• 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
ARCHANA RAI
p. 5.135 Fig. 5-6

• 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

 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

• Web cam is a video camera
that can be used to take
images for uploading to the
Web

 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

 Devices with flat-panel displays
• Tablet PCs
• PDAs
• Cellular phones
• Desktop computers

 CRTs
 Flat-panel displays
› Gas plasma
› LCD (liquid crystal display)
 Passive matrix
 Active matrix
 Called TFT (thin film transistor)
 Separate transistor for every pixel

 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

 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

 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

 Multifunction printer:
• Scan, copy, fax, and print
• Can be either inkjet or laser
• Cost less than buying
individual units
• Take up less desk space

 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

 Computer work can
lead to physical
problems
 Ergonomics – deals
with reducing
discomfort
 Should sit up straight
at your computer
ARCHANA RAI

 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

 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

 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

› 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

 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

 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

 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

 Long term storage
system and application
software
 Operating system and
application software are
copied from the hard
disk to memory
 Capacity measured in
gigabytes
ARCHANA RAI

 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

 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
ARCHANA RAI

 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

 CDs
 DVDs
 Both are optical
storage and have
three formats:
› Read-only
› Write-once
› Read-and-write
ARCHANA RAI

 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
ARCHANA RAI
SimNet Concepts Support CD: “CDs and DVDs”

 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

 CompactFlash (CF)
 xD-Picture Card (xD)
 SmartMedia (SM) Card
 SecureDigital (SD) card
and MultiMediaCards
(MMC)
 Memory Stick Media

 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

1. How Can I Tell How Many Megapixels My
Camera Should Have to Print Good 8 x
10 Photos?
2. What Type of Mouse Should I Get for
Gaming?
3. Are Flat Panels and Flat Screens the
Same Thing?
4. What Should I look for in a Scanner?

 CompactFlash
card
 Dot pitch
 Flash memory
cards
 Flat-panel display
 Floppy disk
 Gamepad
 Gaming wheel
 Gas plasma display
monitor
 Gigabyte
 Hard disk drive
 Inkjet printer
 Input device
 Joystick

 Kilobyte
 Laser printer
 Liquid crystal display
monitor
 Megabyte
 Memory Stick Media
 Mouse
 Multifunction printer
 MultiMediaCard
 Output device
 Photo inkjet printer
 Refresh rate
 Resolution of a
printer
 Resolution of a
screen
 Scanner

 SecureDigital card
 SmartMedia card
 Storage drive
 Stylus
 Thin film transistor
display monitor
 Touchpad
 Trackball
 Visible image size
 Web cam
 xD-Picture Card
 Zip disk

1. Stacking Bytes
 If a gigabyte were a tree, how high would
it be?
2. Organizing Input and Output Devices

1. Choosing a Digital Camera
2. Buying Books
 Can you find cheaper textbooks on the
Web?

1. How’s My Driving? Just Pop Out the
Flash Memory Card!
 Parents can now review your driving once
you’re home
2. The All-Seeing Global Positioning System
 Should you be trackable 24x7?

1. Comparing Printers
2. Buying a Hard Drive
3. Ordering Photos Online
 How about a smart frame that changes
photos for you?

1. Exploring the Use of Web Cams
2. Researching DVD Recorders
 Want to copy TV shows to a DVD?
3. Multimedia Controller
4. Protect Your Computer from
Unauthorized Use
 Require a fingerprint check before your
keyboard will work

I o device

Recommended

Recommended

More Related Content

What's hot

What's hot (15)

Viewers also liked

Viewers also liked (7)

Similar to I o device

Similar to I o device (20)

More from Archana Rai

More from Archana Rai (16)

Recently uploaded

Recently uploaded (20)

I o device