structure and figure out which block on the DVD is actually in used,
and only read those blocks from the DVD. This work surprisingly well,
and I have been able to almost backup my entire DVD collection using
-this method.</p> So far, python-dvdvideo have failed on between 10 and
+this method.</p>
+
+<p>So far, python-dvdvideo have failed on between 10 and
20 DVDs, which is a small fraction of my collection. The most common
problem is
<a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=720831">DVDs