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GCSE computing paper 1, 1.2 - Memory and Storage, Factors affecting…

- - - - Graphical user interface
      - Contains windows, icons, menus and a pointer
      - Better for less experienced users.
    - - Command line interface
      - Better for more experienced users such as programmers
    - - Menu driven interface
      - Contains lots of lists that take a while to navigate through
    - - Voice driven interface
      - Eg. amazon alexa
      - Best for young or old people who cant use a GUI, Accessible
      - Mute people cannot use
  - - - Allowing for different people to use a computer and retain their own settings and applications
    - - Creating, saving, deleting, editing and storing files.
    - - Transferring memory between the RAM and main memory to make room for programs currently in use
      - Allows for more applications to be in use than RAM would allow
  - - - Plaintext is ran through an encryption algorithm and converted into cyphertext. the encryption key is needed to turn the ciphertext readable again
    - - Putting fragments of files back together to make them read faster
    - - Lossy
        
        Data is lost, used on image and sound files
      - Lossless
        
        Data is not lost, mainly used on text files
      - Removing parts of data to reduce the amount of storage space it takes up.
- - - - the amount of samples or "snapshots" stored per second, measured in hz.
    - - No. of bits used to store each sample
    - - Sample rate x Bit depth x Length
  - - - 8 bits, holds less characters
      - Only european characters
    - - Holds every character and symbol from ever language
    - - Arranged sequentially
- - - - Slow, but high capacity
  - - - Fast, but expensive
- - - - Data stored from 0-9 and A-F, eg. EB 2F 76
    - - Left shift doubles the value
      - Right shift halves value
    - - If a value is over 256, it cannot be stored as a binary value.
- - - - Arithmetic Logic Unit - Carries out logic operations, bit shifts and calculations.
    - - Fast, volatile storage that stores frequently used items of data
    - - Control Unit - Controls how data is moved around the CPU
  - - - A register that stores data from immediate access storage.
    - - Stores the address of the memory location currently being accessed
    - - Stores the address of the next instruction
    - - Store the results of calculations from the ALU