WD Ultrastar DC HC550 18TB WUH721818ALE604-0F59266 7.2K RPM SATA 6Gb/s 3.5" HDD
Model WUH721818ALE604. Interface SATA III. Included is a SATA Power Adapter which ensures compatibility with a wide variety of legacy systems. Rotation Speed 7200 RPM. Dell 2.4TB 10K RPM SAS 12Gb/s 512e 2.5" HDD 400-AUQX G13.