Computer Concepts – Illustrated 8 th edition

1. Computer Concepts – Illustrated 8th edition Unit B: Computer Hardware

2. Objectives • Examine input devices • Examine display devices • Compare printers • Introduce data storage systems • Compare data storage systems Computer Concepts – Illustrated 8th Edition Computer Concepts – Illustrated 8th Edition 2

3. Objectives (continued) Examine optical storage Examine solid-state storage Expand your computer Computer Concepts – Illustrated 8th Edition Computer Concepts – Illustrated 8th Edition 3

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 Computer Concepts – Illustrated 8th Edition 4

5. Figure B-1: Keyboard examples Computer Concepts – Illustrated 8th Edition Computer Concepts – Illustrated 8th Edition 5

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 • Requiredto 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 Computer Concepts – Illustrated 8th Edition 30