This paper looks back at the analysis that has been done for the drive wear-out issue on for the different E-series array systems running at different customers’ sites and uses that data to give more specific guidance on thresholds for a preemptive drive removal. Motivation of DHM: Customers with old ventage or Refurbished drive replacement may experience a data loss event and continues to see a high drive failure rate >5% AFR (Annual Failure Rate). Storage vendors expect to see high fallout rates across the hard drive population as they age.