WD Ultrastar DC HC550 WUH721816AL5204 - Hard drive - 16 TB - internal - 3.5 inch - SAS 12Gb/s - 7200 rpm - buffer: 512 MB

Industry's first Energy-Assisted Magnetic Recording technology, Industry's first Triple Stage Actuator, Leading HelioSeal technology, Reliable, field-proven design across five generations, HelioSeal design delivers power efficiency (Watts/TB), 2.5M hours MTBF rating,