Patent ID: 7428122

Claim:
A disk drive comprising: a functional unit including a disk as an information storage medium; a case configured to contain the functional unit; and a cover configured to cover the functional unit contained in the case; wherein the case includes a burring having an internal thread cut on an inner wall thereof, the burring being formed on a region at which the cover is attached to the case, wherein the inner wall projects in a direction from a surface of the region toward the cover; and wherein the cover is screw-fastened at the burring, wherein the cover has a flat portion received in each recess formed on respective fastening regions of the cover and at which the cover is screw-fastened to the case; wherein the flat portion includes: a burring having a diameter larger than a diameter of the burring of the case and having an inner wall projecting in the same direction as the burring of the case; and wherein the burring of the case is fitted into the burring of the cover to be screw-fastened.