HDD

SEAGATE 18TB Exos X18 Enterprise HDD, 7200 RPM, 256MB cache, 270 MB/s, SATA III

WD GOLD Enterprise HDD 18TB 3.5", 7200 RPM, 512MB Cache, up to 269MB/s transfer rate

WD PURPLE PRO Surveillance HDD 18TB SATA 6 Gb/s, 512 MB Cache, 3.5", 7200 rpm, up to 272MB/s, CMR