Free Express Shipping! WD 20TB Ultrastar DC HC560 7200 rpm SAS Internal HDD (OEM) 20TB Storage Capacity, 3.5" Form Factor, SAS 12 Gb/s Interface, 512MB Cache, 7200 rpm, Up to 291 MB/s Transfer Rate, 2.5 Million Hours MTBF, 600,000 Load/Unload Cycles,...