HGST Ultrastar He8 Helium 6TB 3.5-Inch 7200RPM SATA ULTRA 512e SE 128MB Cache Internal Bare or OEM Hard Drive - HUH728060ALE604 / 0F23669 Industry's leading 6TB capacity in a standard 3.5-inch form factor for cloud and hyperscale storage systems Industry's best Idle and Active power efficiency (Watts/TB).23% lower operating power than 6TB air drives Reliable, field-proven, 2nd generation HelioSeal process and 7Stac design 2M hours MTBF rating Advanced format 4Kn and 512e models