Patent ID: 7701663
Filing Date: 2010-04-20
Classification: G11B

Abstract:
1. A hard disk drive comprising: a base including a plurality of internal parts related to reading and writing of information, the internal parts including a head stack assembly; a cover which shields an upper surface of the base; a ground rib which provides at least a partial contact area between the upper surface of the base and a lower surface of the cover and grounding the base and cover at a predetermined position to allow the base and cover to closely contact each other; and a plurality of screws coupling the cover to the base by passing through the ground rib, wherein the ground rib is divided into a plurality of separate first, second and third unit rib portions which are spaced apart from each other and arranged along the upper edge portion of the base, wherein the first unit rib portions are located at respective corner areas of a first short side the base where the head stack assembly is located; wherein the second unit rib portions are located at respective corner areas of a second short side of the base which is opposite the first short side of the base; wherein the third unit ribs are located between the first and second unit rib portions on respective long sides of the base; and wherein each of the plurality of first unit rib portions comprises: