Free Express Shipping! WD 20TB Ultrastar DC HC560 7200 rpm SATA III 3.5" Internal HDD 20TB Storage Capacity, 3.5" Form Factor, SATA III 6 Gb/s Interface, 512MB Cache, 7200 rpm, Up to 291 MB/s Transfer Rate, 2.5 Million Hours MTBF, 600,000 Load/Unload...