SEAGATE Exos 7e8 ST4000NM005A 4tb 7200rpm Sas-12gbps 256mb Buffer 512e 3.5inch Enterprise Hard Disk Drive. Enterprise 3.5" HDD for everything Enterprise storage, there's Exos E - the safest and most powerful way to traverse the datasphere and harness its full potential. Always on and always working, the Exos E series of hard drives is loaded with advanced options for optimal performance, reliability, security and user-definable storage management. Built on generations of industry-defining innovation, Exos E is designed to work and perform consistently in enterprise-class workloads. SINGLE PACK