HGST HGST Ultrastar 7K4000 2 TB 3.5" 7200 RPM SATA Internal Enterprise Hard Drive - HUS724020ALA640 / 0F14690 64 MB Cache 3.5-Inch Internal Bare or OEM Drives 0F14690 Industry's leading 2TB capacity in a standard 3.5-inch form factor Industry's best Idle and Active power efficiency (Watts/TB) Reliable, field-proven, 2nd generation HelioSeal process and 7Stac design 2M hours MTBF rating & 5-year limited warranty Advanced format 4Kn and 512e models