Drivers are at risk of running out of free space SharePoint 2010
The SharePoint Health Analyzer detected a condition requiring your attention. Drivers are at risk of running out of free space
To avoid this error there should be 5 times the RAM of free space in the server.
If we have 8 GB of RAM on our server, we need 40 GB of free space on our system drive (C :) to avoid the above error.