Computer Science 1.1.3

Computer Science 1.1.3

1. I/O devices

   • Input
     • keyboard
     • Mouse
     • Webcams
     • Magnetic strip readers
     • Barcode readers
   • Output
     • Speakers
     • Printers
     • Projectors
   • Both
     • Touch screen
   • Performance factors
     • Speed
     • Capacity
     • Cost
     • Relevance
   • Uses of storage
     • Types of storage and their uses
       • Optical devices
         • read from and written to using lasers
           • represented by portions that reflect or scatter the laser
             • Pits
               • Scatter light
               • Represent 0's
             • Lands
               • Represent 1's
               • Reflect light
         • CD (compact disc)
           • most commonly used for audio files
             • can also be used for text and digital images
           • easily scratched and damaged
           • Slow transfer speeds
         • DVD / Blu-Ray
           • Higher storage than CDs
             • Blu-Rays have the highest storage capacity
           • Commonly used for videos