When createing alert to pull disk usage vrops does not see all disks

I am trying to creat an alert that will notify me when a disk partition reaches a certain point.  I have UNIX and Window systems and I do have it working to a point. My issue is that it seems that Vrops is not seeing all the disk partitions for the window servers. It does see all the current UNIX,  Wondering if there is a way to manually input the partitions or if there is a way to force vrops to auto-discover the partitions. Would really like to auto-discover. included is screen shot of what i am seeing.  Thanks for any help provided