title: How does "deep freeze" works?
body: <p>as we all know there is a software called "deep freeze" which you probably know what it does.</p>
  
  <p>Anyway, after some googling I noticed that kind of software(s) called sandboxing or virtualization software however, Im not quite sure since my further searches failed me.</p>
  
  <p>So, here is my question:</p>
  
  <p>How does deepfreeze actually works ? If it were making image of everything in computer(its called virtualization I guess) it would take so much space. If it were creating index of every file and checking them regulary, then it would make my computer "freeze".</p>
  
  <p>So whats the magic ? How does it actually works ? does it realize when I download files by some way ?</p>