title: Disk fragmentation calculation
body: <p>So if I have disk with 10 free spaces. Add two files, A with size 3 and B with size 4.</p>
  
  <p>A A A B B B B - - -</p>
  
  <p>After removing A, - - - B B B - - -</p>
  
  <p>Is now B fragmented or not?</p>