Remove Physical and Virtual Memory out of Percent Disk used charting

While Windows servers list out Physical and Virtual memory as volumes, it would be nice to be able to remove these out of the Percent Disk used charts on the Node Details pages for servers.   While these are volumes, they are not disks and don't need to be reported in this same manner.  An easy option would be to add in a SQL filter when editing the chart and allow for VolumeType is equal to 'Fixed Disk' to be entered.  Another option would be for Percent Disk Used charts to add in code to only look at Fixed Disks and not memory or RAM.