Dual gasket for manufacturing of hermetically-sealed hard disk drive

A method of manufacturing a hermetically-sealed hard disk drive, the method comprising:

• positioning a first gasket seal composed of a first material over a sealing step surface of sidewalls of an enclosure base;
• positioning a second gasket seal composed of a second material over the sealing step surface adjacent to the first gasket seal;
• and
• affixing a first cover to the base, thereby sandwiching the first gasket seal and the second gasket seal between the first cover and the sealing step surface;
• wherein:
• the first material is a different material than the second material;
• and
• the second material has a lower water vapor transmission than the water vapor transmission of the first material.

A method of manufacturing a hermetically-sealed hard disk drive, the method comprising:

• positioning a first gasket seal composed of a first material over a sealing step surface of sidewalls of an enclosure base;
• affixing a first cover to the base, thereby sandwiching the first gasket seal between the first cover and the sealing step surface;
• positioning a second gasket seal composed of a second material at least in part over the first cover and in contact with each sidewall of the base to fill any gap between the first cover and the base;
• and
• wherein:
• the first material is a different material than the second material;
• and
• the second material has a lower water vapor transmission than the water vapor transmission of the first material.

A hermetically-sealed hard-disk drive comprising:

• a disk medium rotatably mounted on a spindle;
• a head slider housing a read-write transducer configured to read from and to write to the disk medium;
• an actuator configured to move the head slider to access portions of the disk medium;
• an enclosure base;
• a first cover coupled to the base;
• first means for sealing composed of a first material having a lower permeability to a lighter-than-air gas contained within the hard disk drive than the permeability to the lighter-than-air gas of a second material, and positioned to seal the first cover and the base;
• and
• second means for sealing composed of the second material having a lower water vapor transmission than the water vapor transmission of the first material, and positioned to seal the first cover and the base.

A hermetically-sealed hard disk drive comprising:

• an enclosure base having a plurality of sidewalls each having a sealing step surface surrounded by an outer upper edge portion;
• a first cover coupled to the base;
• a first gasket seal composed of a first material and sandwiched between the first cover and the sealing step surface of each sidewall of the base to seal an interface between the first cover and the base;
• and
• a second gasket seal composed of a second material and configured to seal the interface between the first cover and the base;
• wherein:
• the first material is a different material than the second material;
• and
• the first material has a lower permeability to a lighter-than-air gas contained within the hard disk drive than the permeability to the lighter-than-air gas of the second material.