Control system to regulate the concentration of vapor in a hard disk drive

A hard drive comprising:

• a first cavity formed within a first object, wherein the first cavity includes a source chemical which provides a vapor;
• a second cavity formed within the first object, wherein the second cavity includes an absorptive chemical which absorbs the vapor;
• a hard drive housing including a third cavity formed within the hard drive housing;
• a first conductance path between the first cavity and the third cavity, wherein the first conductance path has a first conductance;
• and
• a second conductance path between the second cavity and the third cavity, wherein the second conductance path has a second conductance, and wherein the first conductance and the second conductance maintain a partial pressure level of the vapor within the third cavity.

A hard drive comprising:

• a source/drain unit including:
• a first cavity formed within the source/drain unit, wherein the first cavity includes a chemical which provides a corrosion inhibiting vapor;
• and
• a second cavity formed within the source/drain unit, wherein the second cavity includes an activated carbon which absorbs the corrosion inhibiting vapor;
• a hard drive housing including a third cavity formed within the hard drive housing;
• a first conductance channel between the first cavity and the third cavity, wherein the first conductance path has a first conductance;
• and
• a second conductance channel between the second cavity and the third cavity, wherein the second conductance path has a second conductance, and wherein the first conductance and the second conductance maintain a partial pressure level of the corrosion inhibiting vapor within the third cavity.