Resolution
Please download the attached xml file and run the following command
[FMS_HOME]/bin/fglcmd -cmd util:configimport -f /path/to/detect_readonly_rule.xml
It will import an example rule named "Detect LogicalDisk Changed to Read-only".
Note:
From "Script Console" listing LogicalDisk, checking display information under "Access Information"
It shows writable "true" or "false"
This is how you know whether a host is writable or not.
If you want to Diagnose the functionality of this rule, go to Rules, locate rule "Detect LogicalDisk Changed to Read-only", click on it and open "Diagnostic Details.