Computers Are Your Future Twelfth Edition Chapter 3: Input/Output and Storage Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 1

Computers Are Your FutureTwelfth Edition

Chapter 3: Input/Output and Storage

Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 1

Input Devices: Giving Commands

• Inputo Data or instructions entered into a computer

• Input deviceo Hardware that gives users the ability to

enter data and instructions into RAMo Keyboard

• Most common input data entry



• Special keyboard keys:o Toggle keys—either on or offo Function keys—perform specific actions

depending on the program• F1 - Help



• Pointing deviceoMouse

• most popular pointing device



• Mice alternativeso Trackballo Pointing sticko Touchpad (also called a trackpad)o Click wheelo Joysticko Styluso Touch screen



• Alternative input deviceso Microphones for speech or voice recognitiono Scanner for optical character recognition (OCR)o Bar code reader

• UPC – Universal Product Codeo Optical mark reader (OMR)o Radio frequency identification (RFID reader)o Magnetic stripe card readero Biometric input deviceo Digital cameras and digital video cameraso Webcams


http://www.youtube.com/watch?v=_xNhL39uD7I

http://www.youtube.com/watch?v=zBz3aoikLpU&feature=related

http://www.youtube.com/watch?v=u3dUCSvcffU

Output Devices: Engaging Our Senses

• Output deviceso Users can see, hear, or feel the end

result of processing operationso Most popular output devices

• Monitors (also called displays)• Printers



• Monitorso Display a temporary copy (soft copy) of

processed datao Measure screen diagonallyo Types of monitors include:

• Cathode-ray tube (CRT)—legacy technology

• Liquid crystal display (LCD) – flat panel



• Resolutiono Refers to the sharpness of an imageo Number of pixels (picture elements) controls

the resolutiono Bit-mapped Image – matrix of pixelso Higher Resolution - clearer



• Printerso Creates hard copy of outputo Types include:

• Inkjet• Laser• Dot-matrix• Thermal-transfer (sometimes called dye

sublimation printers)• Photo• Plotters


Output Devices: Engaging Our Senses• Printers (con’t.)

o Inkjet (nonimpact)—popular with home users• Provide excellent images—made up of

small dots• Advantages:

o Inexpensiveo Generate professional color output

• Disadvantages:o Relatively slow



• Printers (con’t.)o Laser (nonimpact)

• Use electrostatic reproductive technology to produce high-quality output

• Advantages:o High-resolution o Print faster than inkjet printers

• Disadvantageso Color laser printers more expensive



• Printerso Thermal-transfer (dye sublimation

printers)• Use heat process• Advantages

o High-quality images from the high-quality thermal-wax printers

• Disadvantageso High-quality thermal printers expensive



• Printers (con’t.)o Photo

• Uses special ink and paper

• Often are inkjet printers• Prints directly from a

digital camera or memory card

o Plotters • Produce images through

moving ink pens• Used for making

oversized prints (i.e., maps, charts, blueprints)


Output Devices: Engaging Our Senses• Other output devices

include:o Speakerso LCD projectorso Multifunction devices


Storage: Holding Datafor Future Use

• Storageo Process of saving software and datao Also called secondary storageo Demand has increased for storage



• Storage deviceso Hardware that contains the tools to place

data on the recording mediao Recording media—hold data

• Hard disks• Floppy disks • Flash memory• CDs and DVDs





• Hard disk drive (hard drive)o Most important storage deviceo High-capacity, high-speed deviceo Platters – fixed rotating diskso Read write Head - records information


http://www.youtube.com/watch?v=fBBBQKXGUYI&feature=related



Bad Sectors – damaged areas


• CD drives and DVD drives o Optical storage devices o Use laser beams to store data through:

• Pits, the indentations, a binary 0• Lands, the flat reflective areas, a binary 1

• Optical discso CD-ROM or DVD-ROM (compact or digital

video disc read-only memory) o Data can be read, not alteredo Most popular, least expensive


http://www.youtube.com/watch?v=5YLqwTqpDhA&NR=1




o CD-R (CD-recordable)o CD-RW (CD-rewritable)o DVD+R (DVD

recordable; plus)o DVD-R (DVD recordable;

dash)

o DVD+RW (DVD rewritable; plus)

o DVD-RW (DVD rewritable; dash)

Optical Storage



oOptical Storage

• BD-ROM (Blu-ray Disc read only)• BD-R (BD recordable)• BD-RE (BDisc rewritable)

oHigh Definition videooLarge amounts of data



• Solid-state drive (SSD)o Storage devices that use solid-state circuitry;

have no moving partso Nonvolatile storage

• USB flash drives (memory stick, thumb drive, jump drive)oPopular removable storage devicesoReplace legacy technology of floppy disksoShould be removed only when not actively

in use


http://www.youtube.com/watch?v=epWd5ZFCNhI


• Flash memory cards o Solid-state storage device o Used with MP3 players,

smartphones, digital cameras



• Backupo Copy of programs, data, and information

created in one secondary storage medium duplicated to another

o Prevents permanent loss of programs, data, and information

o Keep on a regular schedule


Documents

Computers Are Your Future Twelfth Edition Chapter 3: Input/Output and Storage Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 1