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A disk drive includes a disk drive base, a disk rotatably coupled to the disk drive base having a disk surface, a head stack assembly rotatably coupled to the disk drive base adjacent the disk surface, and a cover attached to the disk drive base enclosing the disk and head stack assembly there betwe

A disk drive includes a disk drive base, a disk rotatably coupled to the disk drive base having a disk surface, a head stack assembly rotatably coupled to the disk drive base adjacent the disk surface, and a cover attached to the disk drive base enclosing the disk and head stack assembly there between. The cover includes a metal layer and a polymer layer substantially coextensive with the metal layer and extending substantially across the disk drive base. The polymer layer includes a polymer layer feature extending away from the metal layer towards the disk drive base. The polymer layer feature defines a cavity between the polymer layer and the metal layer.

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We claim: 1. A disk drive comprising: a disk drive base; a disk rotatably coupled to the disk drive base, the disk including a disk surface; a head stack assembly rotatably coupled to the disk drive base adjacent the disk surface; and a cover attached to the disk drive base enclosing the disk and h

We claim: 1. A disk drive comprising: a disk drive base; a disk rotatably coupled to the disk drive base, the disk including a disk surface; a head stack assembly rotatably coupled to the disk drive base adjacent the disk surface; and a cover attached to the disk drive base enclosing the disk and head stack assembly there between, the cover including: a metal layer; and a polymer layer substantially coextensive with the metal layer and extending substantially across the disk drive base, the polymer layer including a polymer layer feature extending away from the metal layer towards the disk drive base, the polymer layer feature defining a cavity between the polymer layer and the metal layer. 2. The disk drive of claim 1 wherein the polymer layer is separately formed from the metal layer. 3. The disk drive of claim 1 wherein the polymer layer is formed upon the metal layer. 4. The disk drive of claim 1 wherein the disk includes an outer edge, the polymer layer feature defines a disk shroud segment extending along the outer edge of the disk. 5. The disk drive of claim 1 wherein the polymer layer feature is disposed adjacent the disk surface. 6. The disk drive of claim 5 wherein the head stack assembly includes an actuator arm disposed along the disk surface, the polymer layer feature is disposed upstream of the actuator arm for diverting disk rotation induced airflow from the actuator arm. 7. The disk drive of claim 1 further includes an air filter disposed within the disk drive base, the polymer layer feature is disposed adjacent the air filter for diverting disk rotation induced airflow through the air filter. 8. The disk drive of claim 1 wherein the metal layer includes a first filter hole and the polymer layer feature includes a second filter hole extending through the polymer layer at the cavity, the first and second filter holes extend to the cavity with the cavity defining a passageway to form a labyrinth filter. 9. The disk drive of claim 1 wherein the cover includes damping material disposed between the metal layer and the polymer layer. 10. The disk drive of claim 1 wherein the damping material is disposed in the cavity. 11. The disk drive of claim 1 wherein a gasket is disposed between the cover and the disk drive base. 12. The disk drive of claim 11 wherein the gasket is in direct contact with the disk drive base and the polymer layer. 13. The disk drive of claim 11 wherein the gasket is in direct contact with the disk drive base and the metal layer. 14. The disk drive of claim 13 wherein the polymer layer is laterally surrounded by the gasket. 15. A cover for use with a disk drive, the disk drive including a disk drive base and a disk rotatably coupled to the disk drive base, the disk including a disk surface, the cover comprising: a metal layer; and a polymer layer substantially coextensive with the metal layer and formed to extending substantially across the disk drive base, the polymer layer including a polymer layer feature extending away from the metal layer and extendable towards the disk drive base, the polymer layer feature defining a cavity between the polymer layer and the metal layer. 16. The cover of claim 15 wherein the polymer layer is separately formed from the metal layer. 17. The cover of claim 15 wherein the polymer layer is formed upon the metal layer. 18. The cover of claim 15 wherein the disk drive includes a disk with an outer edge, the polymer layer feature defines a disk shroud segment extendable along the outer edge of the disk. 19. The cover of claim 15 wherein the disk drive includes a disk with a disk surface, the polymer layer feature is disposable adjacent the disk surface. 20. The cover of claim 19 wherein the disk drive includes a head stack assembly with an actuator arm disposed along the disk surface, the polymer layer feature is disposable upstream of the actuator arm for diverting disk rotation induced airflow from the actuator arm. 21. The cover of claim 15 wherein the disk drive base includes an air filter disposed within the disk drive base, the polymer layer feature is disposable adjacent the air filter for diverting disk rotation induced airflow through the air filter. 22. The cover of claim 15 wherein the metal layer includes a first filter hole and the polymer layer feature includes a second filter hole extending through the polymer layer at the cavity, the first and second filter holes extend to the cavity with the cavity defining a passageway to form a labyrinth filter. 23. The cover of claim 15 wherein the cover includes damping material disposed between the metal layer and the polymer layer. 24. The cover of claim 15 wherein the damping material is disposed in the cavity. 25. The cover of claim 15 wherein a gasket is disposed upon the cover. 26. The cover of claim 25 wherein the gasket is in direct contact with the polymer layer. 27. The cover of claim 25 wherein the gasket is in direct contact the metal layer. 28. The cover of claim 27 wherein the polymer layer is laterally surrounded by the gasket. 29. A cover for use with a disk drive, the disk drive including a disk drive base and an internal environment, the cover comprising: a metal layer formed to extend substantially across the disk drive base; and a polymer layer disposed adjacent to the metal layer in a generally parallel arrangement, wherein the polymer layer is separately formed from the metal layer and wherein the polymer layer is a clean material relative to the internal environment of the disk drive; wherein the polymer layer has a thickness in the range 0.01 to 0.02 inches. 30. The cover of claim 29 further comprising glue that attaches the polymer layer to the metal layer. 31. The cover of claim 30 wherein the glue comprises an adhesive damping material disposed between the metal layer and the polymer layer. 32. The cover of claim 31 wherein the adhesive damping material takes the form of a thin sheet. 33. The cover of claim 29 further comprising at least one fastener that attaches the polymer layer to the metal layer. 34. The cover of claim 29 wherein the polymer layer is laterally surrounded by a gasket.