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

Input Devices: Giving Commands Input o Data or instructions entered into a computer Input device o Hardware that gives users the ability to enter data and instructions into RAM o Keyboard Most common input data entry Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 2

Input Devices: Giving Commands Special keyboard keys: o Toggle keys—either on or off o Function keys—perform specific actions depending on the program F1 - Help Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 3

Input Devices: Giving Commands Pointing device o Mouse most popular pointing device Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 4

Input Devices: Giving Commands Mice alternatives o Trackball o Pointing stick o Touchpad (also called a trackpad) o Click wheel o Joystick o Stylus o Touch screen Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 5

Input Devices: Giving Commands Alternative input devices o Microphones for speech or voice recognition o Scanner for optical character recognition (OCR) o Bar code reader UPC – Universal Product Code o Optical mark reader (OMR) o Radio frequency identification (RFID reader) Radio frequency identification RFID o Magnetic stripe card reader o Biometric input device Biometric input device o Digital cameras and digital video cameras o Webcams Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 6

Output Devices: Engaging Our Senses Output devices o Users can see, hear, or feel the end result of processing operations o Most popular output devices Monitors (also called displays) Printers Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 7

Output Devices: Engaging Our Senses Monitors o Display a temporary copy (soft copy) of processed data o Measure screen diagonally o Types of monitors include: Cathode-ray tube (CRT)—legacy technology Liquid crystal display (LCD) – flat panel Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 8

Output Devices: Engaging Our Senses Resolution o Refers to the sharpness of an image o Number of pixels (picture elements) controls the resolution o Bit-mapped Image – matrix of pixels o Higher Resolution - clearer Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 9

Output Devices: Engaging Our Senses Printers o Creates hard copy of output o Types include: Inkjet Laser Dot-matrix Thermal-transfer (sometimes called dye sublimation printers) Photo Plotters Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 10

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 Inexpensive o Generate professional color output Disadvantages: o Relatively slow Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 11

Output Devices: Engaging Our Senses 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 Disadvantages o Color laser printers more expensive Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 12

Output Devices: Engaging Our Senses Printers o Thermal-transfer (dye sublimation printers) Use heat process Advantages o High-quality images from the high-quality thermal-wax printers Disadvantages o High-quality thermal printers expensive Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 13

Output Devices: Engaging Our Senses 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) Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 14

Output Devices: Engaging Our Senses Other output devices include: o Speakers o LCD projectors o Multifunction devices Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 15

Storage: Holding Data for Future Use Storage o Process of saving software and data o Also called secondary storage o Demand has increased for storage Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 16

Storage: Holding Data for Future Use Storage devices o Hardware that contains the tools to place data on the recording media o Recording media—hold data Hard disks Floppy disks Flash memory CDs and DVDs Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 17

Storage: Holding Data for Future Use Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 18

Storage: Holding Data for Future Use Hard disk drive (hard drive) Hard disk drive o Most important storage device o High-capacity, high-speed device o Platters – fixed rotating disks o Read write Head - records information Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 19

Storage: Holding Data for Future Use Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 20 Bad Sectors – damaged areas

Storage: Holding Data for Future Use CD drives and DVD drives o Optical storage devices o Use laser beams to store data through: Pits, the indentations, a binary 0 Pits Lands, the flat reflective areas, a binary 1 Optical discs o CD-ROM or DVD-ROM (compact or digital video disc read-only memory) o Data can be read, not altered o Most popular, least expensive Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 21

Storage: Holding Data for Future Use Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 22

Storage: Holding Data for Future Use 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 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 23

Storage: Holding Data for Future Use o Optical Storage BD-ROM (Blu-ray Disc read only) BD-R (BD recordable) BD-RE (BDisc rewritable) o High Definition video o Large amounts of data Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 24

Storage: Holding Data for Future Use Solid-state drive (SSD) o Storage devices that use solid-state circuitry; have no moving parts o Nonvolatile storage USB flash drives (memory stick, thumb drive, jump drive) USB flash drives o Popular removable storage devices o Replace legacy technology of floppy disks o Should be removed only when not actively in use Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 25

Storage: Holding Data for Future Use Flash memory cards o Solid-state storage device o Used with MP3 players, smartphones, digital cameras Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 26

Storage: Holding Data for Future Use Backup o 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 Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall 27