Go to Administration -> Tooling -> Script Console, and paste the following into the query box:  LogicalDisk : (host.agents.type in {'ActiveDirectory', 'ExchangeAgent', 'WindowsAgent'}) and (detail.writable != false)  select 'Do Query' and Let us know if that succeeds.  (It just worked for me)
Hi,  I have created a new rule to monitor the drive space available in megabytes using logicaldisk topology for my windows Hosts. The rule is also trigger alerts for CD/DVD drives. I would need to exluded them from monitoring/alerting. Please guide if you have any idea how it can be exluded/ignored.  Scope query I am using : LogicalDisk : host.agents.type in {'ActiveDirectory', 'ExchangeAgent', 'WindowsAgent'} With spaceAvailable property. DVD drive alerts are ignored if I use LogicalDisk capacityavailable property. But it shows the free space available in % which I dont need. 
exlude alerts for DVD drives on Logical disk space available rule