title: What is the difference between a variable-blocked format and a fixed-blocked format?
body: <p>I have encountered these terms in a data file definition document for some data that I'm getting from a Mainframe system.</p>
  
  <p>I failed to find definitions of these terms in any glossary or Google search - just mentions of them.</p>
  
  <p>Can anyone shed some light on the precise meaning of these terms?</p>