System software

  • Created by: 15j.price
  • Created on: 03-06-19 09:34
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  • SYSTEM SOFTWARE
    • Operating System
      • User management
        • One computer can be set up to allow several users to log in, each with their own personalised setting and preferences (e.g. left handed mouse) and these settings are all controlled by the operating system
      • Peripherals
        • controlled by software called device drivers. Standard drivers (mouse and keyboard) are included in the operating system, however more specialist peripherals may need drivers programmed by the manufacturer which convert signals into machine code
      • File management
        • The most common way for files to be organised in a system is with a hierarchical system where files are stored in directories (known as folders in a Windows system). This is controlled by the operating system
      • Memory management and multitasking
        • The CPU works faster than RAM and can work at full capacity and process one commands without waiting for the next as operating system feeds multiple commands to the CPU so it is not waiting for the next command to be loaded
    • Utility System Software
      • Defragmentation
        • as files are deleted, they leave gaps and future files fill these gaps by splitting data into small chunks. This can slow down a system and defragmentation software allows the system to reorganise the files so that the pieces of data are put back together
      • Utility Software
        • programs that are installed to perform a specific function, usually to improve the efficiency or security of a computer system
      • Data compression
        • compressing a file takes up fewer bits than the original size and can save space. when data is compressed it can be transmitted over a network more quickly than sending a large file in a decompressed state
      • Encryption
        • encryption software converts data into an unreadable format which only authorised users can decode to stop cyber-criminals from "listening in" when messages are transported around a network
      • Backing up
        • types of back ups
          • incremental
            • only backs up those files which have been altered since the last back up
          • full
            • backs up everything
        • backing up data allows a copy to be stored in case the original data is lost or damaged
    • Functions
      • operating and controlling the computer hardware
      • disk and file management
      • allocating system resources
      • providing an interface for the computer users
    • Purpose
      • To provide an interface between the user, the applications software and the hardware

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