Seagate Exos X18 12TB 3.5" 512E/4KN SAS Enterprise Hard Drive Storage Capacity: 12TB Cache: 256MB RPM: 7200 RPM Random Read/Write 4K QD16 WCD (IOPS): 170/550 Interface: SAS 12Gb/s MTBF: 2,500,000 hours Helium Sealed-Drive Design Operating Temperature: 5 to 60 degrees Celsius ST12000NM004J