1. Discovering Computers Fundamentals, 2010 Edition Living in a Digital World Chapter Two Input, Output and Storage

2. 2 What Is Input? Input is any data and instructions entered into the memory of a computer 2

3. 3 What Is Input? An input device is any hardware component that allows users to enter data and instructions into a computer 3

4. 4 Keyboard and Pointing Devices A keyboard is an input device that contains keys users press to enter data and instructions into a computer A mouse is a pointing device that fits under the palm of your hand comfortably 4

5. 5 Touch Screens A touch screen is a touch-sensitive display device 5

6. 6 Other Types of Input 6

7. 7 7 A digital camera is a mobile device that allows users to take pictures and store them digitally A flatbed scanner creates a file of the document in memory A bar code reader: uses laser beams to read bar codes

8. 8 Other Types of Input Biometrics authenticates a person’s identity by verifying a personal characteristic 8 Fingerprint reader Face recognition system Hand geometry system Voice verification system Signature verification system Iris recognition system Retinal scanners

9. 9 Other Types of Input 9 fingerprint reader iris recognition system

10. 10 What Is Output? Output is data that has been processed into a useful form 10

11. 11 What Is Output? An output device is any type of hardware component that conveys information to one or more people 11 Display devices Printers Speakers, headphones, and earbuds Data projectors Interactive whiteboards

12. 12 Display Devices A display device visually conveys text, graphics, and video information A monitor is packaged as a separate peripheral – LCD monitor (Liquid Crystal Display) – LED monitor (Light-Emitting Diodes ) – Plasma monitors 12

13. 13 Printers A printer produces text and graphics on a physical medium Different types of printers – Ink-jet printer – Laser printer – Plotters are used to produce high-quality drawings 13

14. 14 Printers 14

15. 15 Other Output Devices Headphones are speakers that cover your head or are placed outside of the ear Earbuds (also called earphones) rest inside the ear canal 15

16. Discovering Computers Fundamentals, 2010 Edition Living in a Digital World Part Two

17. Storage Storage holds data, instructions, and information for future use A storage medium is the physical material on which a computer keeps data, instructions, and information 17

18. Storage 18

19. Storage Capacity is the number of bytes a storage medium can hold 19

20. Storage A storage device is the computer hardware that records and/or retrieves items to and from storage media 20 Reading is the process of transferring items from a storage medium into memory Writing is the process of transferring items from memory to a storage medium

21. Hard Disks A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information 21

22. Hard Disks The hard disk arms move the read/write head, which reads items and writes items in the drive 22

23. Flash Memory Storage Flash memory chips are a type of solid state media and contain no moving parts Solid state drives (SSDs) have several advantages over magnetic hard disks: 23 Faster access timeFaster transfer rates Generate less heat and consume less power Last longer

24. Flash Memory Storage A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer 24

25. Flash Memory Storage USB flash drives plug into a USB port on a computer or mobile device 25

26. Optical Discs A CD-ROM can be read from but not written to Read from a CD-ROM drive or CD-ROM player A CD-R is a multisession optical disc on which users can write, but not erase A CD-RW is an erasable multisession disc Must have a CD-RW drive 26

27. Optical Discs A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase Requires a DVD-ROM drive A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB DVD-RW, DVD+RW, and DVD+RAM are high- capacity rewritable DVD formats 27

28. Other Types of Storage Enterprise storage stores huge volumes of data and information for large businesses – Uses special hardware for heavy use, maximum availability, and maximum efficiency 28