diff -urN a/ganglia-3.1.1/gmond/python_modules/disk/multidisk.py b/ganglia-3.1.1/gmond/python_modules/disk/multidisk.py
--- a/ganglia-3.1.1/gmond/python_modules/disk/multidisk.py	2008-08-25 13:44:57.000000000 -0400
+++ b/ganglia-3.1.1/gmond/python_modules/disk/multidisk.py	2008-11-18 21:40:41.768077035 -0500
@@ -92,6 +92,7 @@
         'slope': slope,
         'format': fmt,
         'description': desc, 
+        'groups': 'disk',
         'mount': line[1]}
     return d