Through the years we’ve had the chance to review several 3.5″ and 2.5″ HDD models ranging from normal everyday ones ideal for consumer use and up to enterprise class ones designed for 24/7 heavy duty workloads. However no matter how many HDDs we’ve gotten our hands onto we never really got interested in testing an enterprise class self-encrypting model since we just didn’t feel it was needed. That changed recently when some readers asked us whether or not self-encrypting models share the same performance numbers as their normal brothers and since we too were quite interested as well we decided to check it out. Of course aside the self-encrypting drive itself we also needed to have the normal version in our hands and what better candidate than the Enterprise Capacity 3.5 (AKA Constellation ES.3) 4TB drives by Seagate which we reviewed a while back? So today plugged into our primary test rig we have the latest Enterprise Capacity 3.5 SED 4TB SATA III drive by Seagate.