To provide a method for directly embedding a
gasket seal in particular into a base plate for the purpose of providing a larger disc storage region in a hard disk drive and also to provide an
enclosure base.SOLUTION: A base plate (
enclosure base plate) 500 of a hard disk drive includes: a groove 504 that extends from an inner side wall surface 502a into a side wall 502; and a
gasket seal 512 embedded in the groove. In a context where a
diameter of a recording disk 520-1 gradually becomes larger, a corresponding disk shroud expands, and a corresponding side wall of the base plate becomes narrower, such a base plate is configured such that a first cover 510 can be physically engaged with a portion of the embedded
gasket seal extending inward away from the side wall surface, whereby a favorable sealing mechanism is provided.SELECTED DRAWING: Figure 5A