Operating systems

Operating systems

1. Managing Resources

   • Machine code is written from the OS instead of to each piece of hardware.
     • The programmer doesn't need to worry about what hardware the user has as the OS will deal with it.
   • Each PC has a different combinations of hardware and OS allow you to use most codes with most combinations.
     • An OS runs directly to the hardware.

2. Resources

   • Peripherals
     • Device attached to a computer
       • Memory Stick
       • Web Camera
       • Keyboard
       • Mouse
   • Printing
     • The operating system will spool your order to print until the printer is ready.
       • This means the computer doesn't need to be affected by the computer running out of ink or not being ready to print.
   • Backing stores
     • Storage devices are used to keep backups of important files.
       • Operating systems can manage this for the user.
         • OS will make regular backups in the format of the appropriate device.
   • File Compression
     • Storing data in a way that uses less space.
       • OS can compress data as its saved and decompresses when its loaded
         • Saves more space
   • Disk de-fragmentation
     • Rearranging file fragments on a physical disk surface to improve loading times.
   • Memory
     • RAM
       • RAM is split into pages to ensure there is enough memory to run the programs
         • Each page is presented to the program as if it is the only memory available.
           • This prevents programs from snooping other programs data.
   • Processes
   • Security