This monitor checks the health of all Physical Disks. If you receive an alert from this monitor, action can be required in order to bring the System back to an operational state.
An unhealthy state indicates that a Physical disk has become unhealthy. This may be caused by disk cable, controller, or power related failures, as well as an actual physical disk failure.
View the Disk Health from the Health Explorer. Replace the unhealthy disk.
Disk Health