Index: head/en_US.ISO8859-1/books/handbook/disks/chapter.xml
===================================================================
--- head/en_US.ISO8859-1/books/handbook/disks/chapter.xml
+++ head/en_US.ISO8859-1/books/handbook/disks/chapter.xml
@@ -1069,7 +1069,7 @@
 	<para>DVD-R: This was the first <acronym>DVD</acronym>
 	  recordable format available.  The DVD-R standard is defined
 	  by the <link
-	    xlink:href="http://www.dvdforum.com/forum.shtml"><acronym>DVD</acronym>
+	    xlink:href="http://www.dvdforum.org/forum.shtml"><acronym>DVD</acronym>
 	    Forum</link>.  This format is write once.</para>
       </listitem>
 
@@ -1094,9 +1094,10 @@
       <listitem>
 	<para><acronym>DVD+RW</acronym>: This is a rewritable format
 	  defined by the <link
-	    xlink:href="http://www.dvdrw.com/"><acronym>DVD+RW</acronym>
-	    Alliance</link>.  A <acronym>DVD+RW</acronym> can be
-	  rewritten about 1000 times.</para>
+	    xlink:href="https://en.wikipedia.org/wiki/DVD%2BRW_Alliance">
+	    <acronym>DVD+RW</acronym> Alliance</link>.  A
+	  <acronym>DVD+RW</acronym> can be rewritten about 1000
+	    times.</para>
       </listitem>
 
       <listitem>