Seagate Exos X20 20TB 3.5" 512e/4Kn SATA3 Enterprise Hard Drive Storage Capacity: 20TB Cache: 256MB RPM: 7200 512e Sector Size: 512 Interface: SATA 6Gb/s Random Read/Write 4K QD16 WCD (IOPS): 168/550 Max. Sustained Transfer Rate OD (MB/s, MiB/s): 285/272 Average Latency (ms): 4.16 Interface Access Speed (Gb/s): 6, 3 MTBF: 2.5 Million hours ST20000NM007D 5 Years Limited Warranty