title: archive tar minitar issue in ruby
body: <p>I am using ruby 1.9 on windows server. I'm using archive/tar/minitar to
  untar .tar file of size 45MB.</p>
  
  <p>following code:</p>
  
  <pre><code>Minitar.unpack("../Data/#{@circle_name}/#{@process_date}/#{@process_time}/#{ip_Dir}/#{enb_tar_file_name}","../Data/#{@circle_name}/#{@process_date}/#{@process_time}/#{ip_Dir}")
  </code></pre>
  
  <p>when code is called from command prompt it is working file,takes few
  seconds.
  but from windows scheduler it is taking more than 10 minutes some times
  1 hour to untar the same file.</p>
  
  <p>Anybody has idea of the problem?</p>