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Computer Science - Coggle Diagram

- - - - Windows
      - Linux
      - Android
      - iOS/MacOS
    - - User Interface
        
        File Management/Folder Systems
        
        Organization for user's convenience
        
        Doesn't exist underneath the interface
        
        Permissions
        
        Control who can access the data
        
        Security
        
        Graphical Interface
        
        Convenient for people
        
        Windows
        
        Icons
        
        Menus
        
        Pointers
        
        Command Line
        
        Good for automation
      - Peripheral Management
        
        Examples
        
        Printers
        
        Keyboards
        
        Speakers
        
        Anything plugged into computer
        
        Device Drivers
        
        Translation
        
        Translates between device (hardware) and OS (software)
        
        Compilers
        
        Interpreters
      - Processes
        
        Multitasking
        
        Single Core - time slicing
        
        Decides which app has priority to CPU
      - Memory Management
        
        How RAM is allocated
        
        Virtual Memory
        
        Secondary storage acts as RAM
        
        Holds background programs (actual RAM runs active programs)
        
        Switching between the two causes disk thrashing (damages PC)
        
        Used when you use up all RAM
  - - - Reduces file sizes
      - Quicker upload/download speeds
      - Lossy
      - Lossless
    - - Data can't be read without a key
      - Scrambles file data
    - - "Cleans up" disk
      - Parts of files can be separated on hard drive
        
        Putting them together by closing everything then opening will speed up access
    - - Saves copies of files to other disk/location to prevent data loss
      - Protects against ransomware
        
        Encrypts/deletes files unless you pay
      - Full Backup
        
        Backs up everything
        
        Often less reliable than incremental
      - Incremental
        
        Only backs up recently changed/new data
    - - Scans & removes malicious files
    - - Prevents unwanted access to your network
  - - - Proprietary
        
        Paid for
        
        Easy to install
        
        Carefully developed & tested
        
        Regular updates
        
        Not very customisable
        
        Professional support
      - Open Source
        
        Free/low cost
        
        Use, modify, redistribute as your own
        
        See and change the source code
        
        Malicious software can take advantage of bugs/badly coded parts
        
        Tailor app to your specific needs
        
        Community
        
        Frequent updates & bug fixes
        
        Help & technical support
        
        Difficult to install
- - - - • Data should not be obtained by deception
      - • Should be used only for the purpose clearly stated
      - • Should be processed/used fairly & lawfully & securely
      - • Used data should not be more than is relevant
      - • Should only be kept for as long as necessary
      - • Should be accurate & up to date
      - • Users should be allowed to access and update their data
      - • Data cannot be transferred to countries who do not have adequate data laws to protect the data
    - - • Can’t make unauthorised access to data, especially with the intent to commit further of-fences or to modify/use it for malware
    - - • The public have access to their own information held by public bodies
      - • Can request this data
      - • Public authorities must publish this data
    - - • Music, video, images and software can’t be copies, modified, distributed or sold without the author’s permission
    - - • Your creative work is your work, but others are allowed to copy/distribute/use it for their own work.
    - - Hacking
      - Viruses
  - - - LTR languages vs RTL languages (mirroring)
      - Different colour psychology
    - - Prevents: terrorism, hate speech, illegal activity
      - Consequences: lack of freedom of speech,
  - - - Computers take 10x their weight in fossil fuels to make compared to tech like fridges and cars which take equal amounts
    - - Dioxins, Chromium, Mercury, Radioactive isotopes
    - - 2% of global energy is used by data centres (same as air travel)
      - Data centres permanently switched on