WesternDigital Ultrastar DC HC550 3.5" 18TB Serial ATA III; WD Ultrastar DC ...Western Digital Ultrastar DC HC550 3.5" 18 TB Serial ATA III; WD Ultrastar DC HC550 WUH721818ALE6L4 - Festplatte - 18 TB - intern - 3.5" (8.9 cm) - SATA 6Gb/s - 7200 rpm - Puffer: 512 MBmehr