WD Ultrastar DC HC550 16 TB Hard Drive - 3.5" Internal - SAS (12Gb/s SAS)
WD Ultrastar DC HC550 18 TB Hard Drive - 3.5" Internal - SAS (12Gb-s SAS)
Western Digital Gold WD6003FRYZ 6 TB Hard Drive - 3.5" Internal - SATA (SATA-600)
Western Digital Red Pro WD6003FFBX 6 TB Hard Drive - 3.5" Internal - SATA (SATA-600) - Conventional Magnetic Recording (CMR) Method