Patent ID: 8854766

Claim:
A hermetically sealed disk drive comprising: a disk drive enclosure including a disk drive base with a bottom face and four side faces, and a top cover, wherein the disk drive enclosure has a top face that includes an upper surface of the top cover and an upper surface of the disk drive base; a peripheral foil seal including a continuous metal foil overlapping each of the four side faces and having a first opening therethrough that overlies the upper surface of the to cover, and a first continuous adhesive layer coating the continuous metal foil, the peripheral foil seal conforming to the disk drive enclosure and being adhered to the top face and to each of the four side faces by the first continuous adhesive layer; and a central metal cap completely covering the first opening and being adhered to the upper surface of the top cover through the first opening by a second continuous adhesive layer, the central metal cap being thicker than the continuous metal foil; wherein the disk drive enclosure is helium-filled; and wherein the central metal cap comprises stainless steel having a thickness in the range 0.1 to 1 mm.