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Computer Concepts – Illustrated 8th edition
Unit B: Computer HardwareUnit B: Computer Hardware
Computer Concepts – Illustrated 8th Edition 2
Objectives
Examine input devices
Examine display devices
Compare printers
Introduce data storage systems
Compare data storage systems
Computer Concepts – Illustrated 8th Edition 2
Computer Concepts – Illustrated 8th Edition 3
Objectives (continued)
Examine optical storage
Examine solid-state storage
Expand your computer
Computer Concepts – Illustrated 8th Edition 3
Computer Concepts – Illustrated 8th Edition 4
Examining Input Devices
Most keyboards are similar Typing keypad: keys with letters, numbers Navigation keypad
• Keys such as Home, End, arrow keys, etc.• Can be used to move the insertion point (or
cursor) on the screen
Mouse Used to control an on-screen pointer, etc. Optical mouse Laser mouse
Computer Concepts – Illustrated 8th Edition 4
Computer Concepts – Illustrated 8th Edition 5Computer Concepts – Illustrated 8th Edition 5
Figure B-1: Keyboard examples
Computer Concepts – Illustrated 8th Edition 6
Examining Input Devices (continued)
Other pointing devices: Pointing stick Touchpad (also called a trackpad) Trackball
Other ways to input data: Touch screen Scanner Microphone Digital camera
Computer Concepts – Illustrated 8th Edition 7
Examining Display Devices
CRT (cathode ray tube) monitors Typically not sold with new computer
systems anymore
Technologies commonly used for computer display devices today: LCD (liquid crystal display) screens
• Found with desktop computers and notebook computers
• Also called flat-panel displays
OLED (organic light emitting diodes)• Used by most handheld devices
Computer Concepts – Illustrated 8th Edition 8
Figure B-6: Examples of monitors
Computer Concepts – Illustrated 8th Edition 9
Examining Display Devices (continued)
Graphics card Contains circuitry that generates the signals
for displaying an image on the screen Response rate
• How fast a screen updates the information being displayed
Resolution• Maximum number of horizontal and vertical
pixels that are displayed
Pixel (picture element)• A single point or the smallest unit in a graphic
image
Computer Concepts – Illustrated 8th Edition 10
Examining Display Devices (continued)
Screen size Measurement in inches from one corner
diagonally across to the opposite corner
Dot pitch (dp) A measure of image clarity
Color depth or bit depth Number of colors that a monitor and
graphics card can display
A computer monitor can be used to watch TV
Computer Concepts – Illustrated 8th Edition 11
Comparing Printers
Ink-jet printer Small, lightweight, inexpensive Produces very good-quality color output Ink cartridges can be expensive
Laser printer Used in situations which require high-
volume output or good-quality printouts Require toner cartridge refills or
replacements
Computer Concepts – Illustrated 8th Edition 12
Figure B-9: An ink jet printer Figure B-10: A laser printer
Computer Concepts – Illustrated 8th Edition 13
Comparing Printers (continued)
Printer resolution Determines the quality of printed output Measured in dots per inch (or dpi)
Printer speed Pages per minute (ppm)
Options for connecting printer to computer: USB port, serial port, parallel port, or
network port
Network-enabled printer
Photo printer
Computer Concepts – Illustrated 8th Edition 14
Introducing Data Storage Systems
RAM (random access memory) Used to store data temporarily
A data storage system is made up of: Storage medium
• Hard drive, tape, memory card, flash drive, CD, DVD, etc.
• Holds data
Storage device• Equipment that stores and retrieves data
from its storage medium
Computer Concepts – Illustrated 8th Edition 15
Figure B-12: Examples of storage media and storage devices
Computer Concepts – Illustrated 8th Edition 16
Introducing Data Storage Systems (continued)
Hard drives Preferred type of main storage for most
computer systems
Additional storage devices used with computers: CD/DVD/BD drives USB flash drives Solid-state drives Solid-state card readers
Computer Concepts – Illustrated 8th Edition 17
Comparing Data Storage Systems
Random access (also called direct access) Can jump directly to the requested data
Sequential access Reads through data from the beginning to
the end
Magnetic storage Stores data by magnetizing microscopic
particles on the disk or tape surface Hard drives and tapes
Computer Concepts – Illustrated 8th Edition 18
Figure B-15: Magnetic storage
Computer Concepts – Illustrated 8th Edition 19
Comparing Data Storage Systems (continued)
Optical storage Stores data as microscopic light and dark
spots on the disc surface CDs, DVDs, and BDs
Solid-state storage Stores data in a nonvolatile, erasable, low-
power chip Some hard drives, compact storage cards,
thumb drives, flash drives, memory sticks
Computer Concepts – Illustrated 8th Edition 20
Figure B-16: Optical storage
Computer Concepts – Illustrated 8th Edition 21
Examining Optical Storage
CD-ROM means read-only technology Also true for DVD-ROM, BD-ROM discs
CD-R means CD recordable technology Also true for DVD-R/DVD+R, BD-R discs
CD-RW means CD rewritable technology Also true for DVD-RW/DVD+RW, BD-RE
discs
A computer system can have a CD drive, DVD drive, or BD drive
Computer Concepts – Illustrated 8th Edition 22
Figure B-19: How an optical drive works
Computer Concepts – Illustrated 8th Edition 23
Examining Solid-StateStorage
Solid-state storage technology Stores data in a nonvolatile, erasable, low-
power chip Used in digital cameras, MP3 players, etc.,
or for transporting data
Wide range of solid-state memory cards: CompactFlash (CF) cards MultiMedia cards (MMC) SecureDigital (SD) cards
Computer Concepts – Illustrated 8th Edition 24
Figure B-20: Solid state cards
Figure B-22: Examples of solid-state drives
Computer Concepts – Illustrated 8th Edition 25
Examining Solid-StateStorage (continued)
Card reader Required to transfer data to or from a
computer using solid-state storage cards
USB flash drives and solid-state drives (SSD) Incorporate the memory and the reader into
one device
USB flash drives Easily transportable from one computer to
another
Computer Concepts – Illustrated 8th Edition 26
Expanding Your Computer
Expansion port A connector that passes data between a
computer and a peripheral device
Expansion card A small circuit board that makes it possible
for the computer to communicate with a peripheral device
Expansion bus Segment of the data bus between RAM and
the peripheral devices
Computer Concepts – Illustrated 8th Edition 27
Figure B-23: Common Expansion ports
Computer Concepts – Illustrated 8th Edition 28
Expanding Your Computer (continued)
Expansion slot Long, narrow socket on the motherboard
into which you can plug an expansion card
Device driver Sets up communication between the
computer and a peripheral device or expansion card
USB (universal serial bus) port Used for connecting many peripheral
devices
Computer Concepts – Illustrated 8th Edition 29
Talking Points: Why RecycleComputers?
U.S. landfills already hold more than 2 million tons of computer parts Computer parts contain toxic substances,
such as lead, phosphorus, and mercury
Better options for disposing of computers: Sell it, donate it, recycle it, or send it back to
the manufacturer
About half the states in the U.S. have taken legislative action to deal with the problem
Computer Concepts – Illustrated 8th Edition 30
Summary
This chapter introduced: Components of the computer hardware Computer storage systems Expanding the computer hardware you use
with a computer Disposing of computer hardware in an
environmentally friendly way
Computer Concepts – Illustrated 8th Edition 30