Input, Output, and Storage

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Nov 17, 2013 (3 years and 8 months ago)

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Lesson 5

Input, Output, and Storage

Computer Concepts
BASICS 4
th

Edition

Wells

Lesson 5

Wells

Computer Concepts BASICS

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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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Vocabulary


audio input


biometrics


hard disk


inkjet printer


input



input devices


keyboard


laser printer


monitor


mouse



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Vocabulary (continued)


optical storage


output


output devices


pointing device




solid
-
state storage


USB flash drive


video input



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Input Devices


Input devices

enable you to input data and
commands into the
computer


The type of device is determined by the task
to be completed


Simple as a keyboard or sophisticated as those
for voice or retinal recognition


The
keyboard

is the most commonly used
input device for entering numeric and
alphabetic data into a
computer

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Input Devices (continued)


A wide variety of keyboards are available:


Ergonomic: designed to provide users with more
natural, comfortable hand, wrist and arm position
(reduces carpal tunnel syndrome)


Cordless/wireless: battery
-
powered keyboard that
transmits data using wireless technology


Specialized: keyboard with specialized keys that
represent items such as those in fast
-
food
restaurants


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Input Devices (continued)


Security: provides security features such as
biometric fingerprint reader, and magnetic stripe
and smart card readers


Flexible/foldable: an easily transported keyboard
primarily used with PDA and pocket PC
-
type
devices; it has a soft touch and is water resistant


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Input Devices (continued)


A
pointing device

is an
input device that allows
a user to position the
pointer

on the screen


The
mouse

is the most
commonly used pointing
device for personal
computers


Optical Mouse

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Input Devices (continued)


Four types of mice:


Mechanical: has a ball located on the bottom that
rolls on a flat surface as the mouse is moved.
Sensors inside the mouse determine the direction
and distance of the movement.



Optomechanical
: same as a mechanical mouse
but uses optical sensors to detect motion of the
ball

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Input Devices (continued)


Optical: uses a laser to detect the mouse’s
movement; has no mechanical moving parts;
respond more quickly and precisely


Wireless: battery
-
powered device that relies on
infrared or radio waves to communicate with the
computer

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Input Devices (continued)


Mouse Tasks:


Pointing: placing the on
-
screen pointer at a
designated location


Clicking: pressing and releasing the mouse button
to select a specific location within a document


Dragging: pressing down the mouse button and
moving the mouse while continuing to hold the
mouse button to highlight a selected portion of
text

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Computer Concepts BASICS

Input Devices (continued)


Double
-
clicking: pressing and releasing the
mouse button two times in rapid succession to
select a word


Triple
-
clicking: pressing and releasing the mouse
button three times in rapid succession to select a
paragraph


Right
-
clicking: pressing the right mouse button to
display a menu

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Input Devices (continued)


Rotate wheel: rotating the rotate wheel on the
mouse forward or backward to scroll vertically
through a document screen


Tilt wheel: pressing the mouse’s rotate wheel right
or left to scroll horizontally

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Input Devices (continued)


The
trackball
is a pointing device that works
like a mouse turned upside down; the ball is
on top of the device.

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Input Devices (continued)


The
joystick

and
wheel

are also pointing
devices, primarily used in games
.


Joystick: metal and plastic rod mounted on a base


Wheel: steering wheel type of device


The
pointing stick

looks like an eraser and is
generally on keyboard
.


Pressure sensitive device


Mainly found on notebook computers


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Input Devices (continued)


Graphics tablet (digitizing tablet): a flat
drawing surface on which the user can draw
figures or write something freehand


Touch display screen: special screen with
pictures or shapes


Stylus (digital pen): pen
-
like writing instrument


Audio/Voice Input: process of inputting
sound/voice into the computer using voice
recognition devices

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Input Devices (continued)


Touchpad: commonly used on laptops


Scanner: changes images into codes for input
to the computer


Image Scanner: convert images into electronic form


Bar code scanners: reads bar lines on products


Magnetic scanners: reads magnetic strips on cards


Optical character recognition and Optical mark
recognition: uses a light source to read characters,
marks, and codes; data is converted into digital data

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Input Devices (continued)


Digital Camera: transfers pictures to the
computer’s memory


Video Input: full
-
motion images stored to the
computer


Virtual Devices: uses light emitting and
sensing devices to detect user input


Touch
-
sensitive pad: used on portable
devices such as iPods and Smart phones

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Input Devices (continued)


Biometric
Input: Biometric
is an
authentication technique using a person’s
physiological or behavioral
characteristics
(enrollment, submission, verification)

Biometric keyboard scanner

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Storage Devices


Short
-
term data is stored in RAM (temporary
memory)


Longer term storage requires another
medium such as the hard drive or USB drive


Storage devices are categorized by:


magnetic technology


optical technology


solid
-
state storage media

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Storage Devices (continued)


Magnetic storage devices


Use oxide
-
coated plastic storage media called
Mylar


Data stored on
tracks


Each track is labeled and the location kept in a
file
allocation table (FAT)


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Storage Devices (continued)


Types of magnetic storage:


Floppy disk: a flat circle of iron oxide
-
coated
plastic enclosed in a hard plastic case; 3 ½ in
hols

1.44 MB or more of data


hard disk: stores data inside the computer


Two advantages: speed and capacity


magnetic tape: mostly used for making backup
copies of large volumes of data


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Storage Devices (continued)


Hard disk

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Storage Devices (continued)


Optical storage devices


Use laser technology to
read/write on silver platters


Most common types are
CDs and DVDs


Blu
-
ray is a new high
-
capacity storage medium
that is expected to
replace conventional
DVDs



A laser reads data on a CD or DVD

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Storage Devices (continued)


Solid
-
state storage media


Non volatile, removable medium


Everything processed electronically, no moving
parts


Miniature mobile media, USB flash drives


Miniature mobile storage media

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Caring for Storage Media


Keep away from magnetic fields (monitor or TV)


Avoid extreme temperatures


Remove from drive and store properly when not
in use


Hold optical discs at the edges


Do not remove media from a drive when the
drive indicator light is on


Keep disks in a sturdy case when transporting

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Output Devices


Output

is data that has been processed into a
useful format


Printed text,


spoken
words,


music
,


pictures
,


video
, or


graphics



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Output Devices (continued)


Monitors

is an output device used as a
computer display


CRT, LCD, and gas plasma





a. CRT b. LCD display c. Gas plasma display

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Output Devices (continued)


Printers

are evaluated based on speed, print
quality, and price


Impact and non
-
impact models


Laser printers (non
-
impact)


Inkjet printers (non
-
impact)


Dot matrix (impact)


Specialty printers: thermal, mobile, label, and
plotters



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Output Devices (continued)


Other Output Devices:


Speakers and headsets


Fax machines and fax modems


Multifunction peripherals


such as an all
-
in
-
one machine that does printing,
scanning, copying, and faxing


Data projectors

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Connecting Input/Output (I/O)
Devices to the Computer


Input and output devices must be connected to
the computer


Physical connection, such as a port


Wireless connection, such as through infrared or
radio waves

Lesson 5

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Computer Concepts BASICS

Summary

In this lesson, you learned:


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 the 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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Lesson 5

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Computer Concepts BASICS

Summary (continued)


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.


Monitors produce soft copy.

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Computer Concepts BASICS

Summary (continued)


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 connected to
the computer.


Some I/O devices communicate with the
computer through a physical connection.


Wireless devices communicate with the
computer through infrared or radio waves.

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