title: Converting bytes to megabytes
body: <p>I've seen three ways of doing conversion from bytes to megabytes:</p>
  
  <ol>
  <li>megabytes=bytes/1000000</li>
  <li>megabytes=bytes/1024/1024</li>
  <li>megabytes=bytes/1024/1000</li>
  </ol>
  
  <p>Ok, I think #3 is totally wrong but I have seen it.  I think #2 is right, but I am looking for some respected authority (like W3C, ISO, NIST, etc) to clarify which megabyte is a true megabyte.  Can anyone cite a source that explicitly explains how this calculation is done?</p>
  
  <p>Bonus question: if #2 is a megabyte what are #1 and #3 called?</p>
  
  <p>BTW:  Hard drive manufacturers don't count as authorities on this one!</p>