NOTE: These HDD is used by Datacenter Servers for about 3 Years period. HDD was refurbished and data wiped with DoD standard. It's fully tested & passed HGST factory diagnose software test. Since this is heavy duty enterprise HDD with a 2.5M-hour MTBF rating. We are confidence that to honor another 5 Years for these hard drives. Buy with confidence & worry free! HGST Ultrastar HE8 delivers the hermetically sealed, helium hard drive, the Ultrastar He8 for massive scale-out environment. Why does helium make a difference? Helium has only one-seventh the density of air. Replacing air with helium inside a hard drive dramatically reduces the turbulence caused by the spinning disks, cuts power consumption and results in a lower temperature within the disk drive. The reduction in turbulence for the spinning disk allows HGST to deliver a seven-disk design in a traditional 3.5-inch form factor. In addition to being the world’s first helium-filled hard drive, HGST Ultrastar He6 is also the first hard drive in the industry to o er a 6-terabyte capacity. This design provides a 50 Percent capacity gain and still reduces the energy needed to run the drive by up to 23 Percent . HelioSeal Delivers Twice the Capacity Using One-Quarter Less Power One-third more capacity and 23 Percent lower energy consumption. Available today. That’s the power of helium. Delivering the industry’s leading capacity at 8TB, Ultrastar He8 is based on the widely accepted and proven HelioSeal platform. HelioSeal technology replaces air with helium inside the drive, reducing air turbulence and enabling 7Stac, a seven-disk design in a traditional 3.5-inch form factor. Ultrastar He8 goes beyond what any air-based HDD can do and seamlessly integrates into virtually any mainstream enterprise environment. Cooler and quieter with industry-leading power efficiency (Watts/TB) and no-compromise performance, the Ultrastar He8 lays