title: Available space on blank dvd / blu-ray discs (IMAPI)
body: <p>Since my original question was a bit too vague, let me clarify.</p>
  
  <p>My goals are:  </p>
  
  <ol>
  <li>to estimate blank disc size after selecting filesystem via IMAPI  </li>
  <li>to estimate space which my file will consume on this disc if i burn it.  </li>
  </ol>
  
  <p>What i would like to know:</p>
  
  <ol>
  <li>Is it possible to get bytes per sector for selected file system programmatically  </li>
  <li>If not, is there default value for bytes per sector which IMAPI uses for different file systems / media types, and is it documented somewhere.</li>
  </ol>