COMPUTER SCIENCE

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  • Computer Science
    • CPU
      • Decode
      • Fetch
        • Moves data from memory locations
      • Execute
        • Runs programs
      • MHZ
        • Clock Speed
          • Cycles per second
      • Dual/Quad core
        • Two/four cores
          • 2/4 times as much at once
    • DATA PROTECTION ACT
      • Obtained and processed fairly and lawfully
      • Kept for a purpose
      • Accurate and up to date
      • Relevant
      • Kept secure against unauthorised access
      • Processed in accordance with the rights of the subject
      • Not kept longer than neccessary
      • Not transferred outside of the EU
    • MEMORY
      • CACHE
        • Needed to access frequently used programs
          • Close to CPU
            • Fast access
        • Expensive
      • ROM
        • Non-volatile
          • Bootstrap Loader
      • VIRTUAL
        • Part of the hard drive
        • Behaves like RAM - when RAM is full
          • So programs and data can still run without crashing when RAM is full
      • RAM
        • Volatile
          • Data and programs currently being used
    • STORAGE UNITS
      • BIT
        • NIBBLE
          • BYTE
            • KILOBYTE
              • MEGABYTE
                • GIGABYTE
                  • TERABYTE
                    • 1024 gigabytes
                      • TB
                  • 1024 megabytes
                    • GB / gbyte
                • 1024 kilobytes
                  • MB / mbyte
              • 1024 bytes
                • kB / kbyte
            • 8 bits
              • 2 nibbles
            • A single keyboard character
          • 4 bits
        • 1 binary digit
    • SECONDARY STORAGE
      • Factors
        • Speed
        • Reliability
        • Portability
        • Capacity
        • Durability
      • Optical
        • Compact Disk (CD) and Digital Versatile Disk (DVD)
          • Direct Access
          • Cheap to produce
          • Quite portable
          • Easily damaged - not v. durable
          • Medium capacity
      • Solid State
        • Flash Drive
          • USB sticks, memory cards for cameras, SD cards (mobiles) etc.
          • Fast Access
          • Direct access
          • 2 GB or more
          • Quite expensive per byte
          • Very portable
          • Very durable
          • Very reliable
      • Magnetic
        • Hard disk
          • Direct Access
          • Internal is faster than external - both fast access
          • Terabyte or more
          • External - portable
          • Very reliable - detects bad areas and doesn't write on them.
          • Very cheap per byte
        • Magnetic tape
          • Large capacity
          • Serial access - slow
          • Cheapest storage per byte
          • Not very portable
      • Online Storage
        • Can be recovered if there is theft/fire
        • Can share files with others
        • Can be accessed from anywhere
      • Network storage
        • Any computer on the network can use the storage space

Comments

12rex

why is half of it cut off

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