computer studies revision sheet

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Across
  1. 6. volatile (contents lost when the power is turned off)
  2. 9. An OS runs multiple applications at the same time
  3. 10. sorts data every time you open an app
  4. 12. utilities reorganize files on hard disks, putting fragments of files together collecting free space.
  5. 14. Data is stored in files, and a filename extension tells the OS which application to load the file into.
  6. 16. utilities reduce file size for less space and files must be extracted before they're read.
  7. 17. this is the best
Down
  1. 1. a term of a dedicated function with a larger mechanical system
  2. 2. this is needed when there is not enough physical RAM to store the open programs.
  3. 3. utilities use an algorithm that scrambles plain text to cipher text, only decodable with key.
  4. 4. The OS lets different users log into one computer, and will retain settings for each of them,
  5. 5. When programs are loaded, the OS decides where they are held in memory.
  6. 7. It is mesured in hertz and it cunts the number 0f cycles per second
  7. 8. Translates OS instructions into commands that the hardware will understand.
  8. 10. this is a complete copy of a cpu
  9. 11. Software is designed to keep your computer safe, running efficiently, and provide you with useful tools for file and application management.
  10. 13. nonvolatile (content is saved when power is switched off
  11. 15. reduces the movement of a read/write head