This alarm indicates that the drive where the operating system is installed is running out of disk space.
Variable
Data collection may fail. CCM Services may fail.
Determine the drive on which the operating system is installed.
Run disk cleanup to try to free up space on that drive.
If that does not free up enough, scan the disk with WinDirStat to identify what is taking up the space and take corrective action.
If all else fails you can move or remove the C:\CIS_60GA and C:\CIS_6.0 folders if they are present. These are the source files for the GA install, and all Service Packs and Fix Packs.
NOTE: Deleting the source folders means that you no longer have the source files, and should you need to add or reinstall a component you will need to start by downloading and unpacking the installer again.
6.1