Fairly easy. In your Generic Report Library open the Performance Top Objects report then:
1. Select you From and To range (ie Monday Previous Week to Monday This Week)
2. Select the Algorithm and N (number) you want to report on (ie Bottom 30)
3. Select the %Logical Disk Free Space rule
4. Select all or specific instances you are interested in
5. Hit Run
Report generated ! You caould then save this report as a favourite report and schedule it to run when you wish.
Note: When selected the rule you will probably see %Logical Disk Free Space twice, this is because there is one for Win2k and one for Win2k3.
Hope that answers your question.
David Allen
http://www.inframon.com
Microsoft MVP - System Center Operations Manager 2007
WMUG Community Leader http://www.wmug.co.uk/blogs/aquilaweb