Western Digital Ultrastar DC HC550 18 TB Hard Drive - 3.5" Internal - SATA
Western Digital Ultrastar DC HC560 0F38785 20 TB Hard Drive - 3.5" Internal - SATA
Western Digital Ultrastar He10 HUH721008ALE604 8 TB Hard Drive - 3.5" Internal - SATA (SATA-600)
Western Digital Ultrastar He12 HUH721212AL4201 12 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS)