Patent ID: 8179631

Claim:
A magnetic disk drive comprising a base accommodating, a disk, a spindle motor for rotationally driving the disk, a head for recording and reproducing information on the disk, a head gimbal assembly for moving the head to an optional position on the disk, an actuator assembly for driving the head gimbal assembly, and a flexible printed circuit (FPC) assembly for electrically connecting between the head, spindle motor, and actuator assembly, and a feed-through for electrical connection to the FPC assembly is mounted in an opening of the base, and the base is joined with a cover, so that a low-density gas is enclosed within the magnetic disk drive, characterized in that: the base has a stepped portion in the inside of a periphery of the opening, and an inclined surface extending to the outside of the base is provided at an edge of a surface of the stepped portion for placing a flange of the feed-through, wherein the stepped portion of the base is joined by a solder fillet with the flange of the feed-through, wherein the solder fillet is formed in both of the inside and the outside of the base, and wherein a portion of the solder fillet formed outside of the base protrudes into the opening from an inner-most periphery of the opening adjacent the feed-through.