This error appeared in the iDRAC interface on a Security Analytics appliance.
Dell R640xl
A predictive failure is similar to an impending failure and means that there was a threshold that was reached, causing the warning. The drive has not failed yet, but it could possibly fail soon.
Generate a TSR report and open a case with technical support. It will most likely result in a drive replacement RMA. For instructions on how to generate a TSR in iDRAC9, see the following article: Using RACADM or iDRAC to generate support logs in Security Analytics