Magnetic disk device including a desiccant assembly and method of manufacturing the same

A method of manufacturing a magnetic disk device, comprising:

• installing a magnetic disk in a base in which a needle protrudes;
• attaching a desiccant assembly on a surface facing the base of a cover including a vent, the desiccant assembly including:
• a case including an opening on a surface facing the base,
• a sealing film covering the opening,
• a division filter that divides space of the case into a first chamber and a second chamber, the second chamber including the opening, and
• a desiccant filled in the first chamber,
• causing the cover to which the desiccant assembly is attached to overlap the base on which the magnetic disk is installed and attaching the cover to the base;
• and
• injecting gas having a density lower than that of air into an internal space formed by the base and the cover through the vent of the cover and forming a housing in which the base and the cover are combined and airtightly closed,
• wherein
• the attaching the cover to the base further includes:
• communicating the second chamber with the internal space of the housing by causing the base and the cover to overlap each other, causing the needle protruding upward in the internal space between the base and the cover to abut on the sealing film, and removing at least a part of the sealing film from the opening with the needle, and
• disposing the desiccant assembly at a position away from the base by a predetermined distance and so as to face the base.