   <on_crash>restart</on_crash>
   <devices>
     <emulator>/usr/lib/xen/bin/qemu-dm</emulator>
-    <disk type="block" device="floppy">
-      <source dev="/dev/null"/>
+    <disk device="floppy">
+      <source file="/foo/bar"/>
       <target dev="fda" bus="fdc"/>
-      <address type="drive" controller="0" bus="0" target="0" unit="0"/>
     </disk>
     <disk type="dir" device="floppy">
       <source dir="/tmp"/>

Domain 'test-many-devices' defined successfully.
Changes will take effect after the next domain shutdown.