Model HC550. Storage Capacity 18TB. Western Digital Ultrastar 10TB - 24TB 7.2K RPM SATA 6Gb/s 3.5" Enterprise HDD. Interface SAS, SAS 12Gb/s. SAS 12Gb/s NOT Compatible w/ Desktop PCs. Dell 4TB 7.2K RPM SATA 6Gb/s 512n CMR 3.5" Enterprise HDD 0HNVFP G13 Tray.
eBay