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A disk drive includes an enclosure having a cover and a base, a spindle motor assembly, a disk, and an arcuate raised portion on the base. The disk is mounted on a hub of the spindle motor assembly and has a first surface and a second surface. The first surface is proximate the base and is spaced ap

A disk drive includes an enclosure having a cover and a base, a spindle motor assembly, a disk, and an arcuate raised portion on the base. The disk is mounted on a hub of the spindle motor assembly and has a first surface and a second surface. The first surface is proximate the base and is spaced apart from the base by a first clearance distance. The arcuate raised portion on the base is spaced apart from the disk by a second clearance distance. The second clearance distance is less than the first clearance distance. At least a portion of the disk is superposed over the arcuate raised portion.

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1. A disk drive comprising:an enclosure having a cover and a base; a spindle motor assembly mounted on the enclosure, the spindle motor assembly including a hub that is rotatable with respect to the enclosure; a disk mounted on the hub, the disk having a first surface, a second surface, and an outer

1. A disk drive comprising:an enclosure having a cover and a base; a spindle motor assembly mounted on the enclosure, the spindle motor assembly including a hub that is rotatable with respect to the enclosure; a disk mounted on the hub, the disk having a first surface, a second surface, and an outer periphery, the first surface being substantially parallel to a portion of the base located beneath the first surface and radially between the hub of the spindle motor assemble and a projection of the outer periphery, the first surface being spaced apart from the base by a first clearance distance; and an arcuate raised portion on the base substantially parallel to the disk and spaced apart from the disk by a second clearance distance that is less than the first clearance distance, at least a portion of the disk superposed over at least a portion of the arcuate raised portion, wherein the arcuate raised portion subtends a central angle of at least about 180 degrees. 2. The disk drive of claim 1, wherein the first surface further comprises an inner circumferential portion and an outer circumferential portion, the second clearance distance being defined between the arcuate raised portion on the base and at least a portion of the outer circumferential portion of the disk.3. The disk drive of claim 1, wherein the first surface further comprises an inner circumferential portion and an outer circumferential portion, the second clearance distance being defined between the arcuate raised portion on the base and at least a portion of the inner circumferential portion of the disk.4. The disk drive of claim 1, wherein the second clearance distance is less than 0.05 inches.5. The disk drive of claim 1, wherein the second clearance distance is between about 0.005 inches and about 0.025 inches.6. The disk drive of claim 1, wherein second clearance distance is about 0.016 inches.7. The disk drive of claim 1, wherein the second clearance distance is about 0.01 inches.8. The disk drive of claim 1, wherein the arcuate raised portion comprises an outer edge and an inner edge, the radial distance between the outer edge and the inner edge being less than about 10 mm.9. The disk drive of claim 1, wherein the arcuate raised portion comprises an outer edge and an inner edge, the radial distance between the outer edge and the inner edge being about 3 mm.10. The disk drive of claim 1, wherein the arcuate raised portion subtends a central angle between about 210 degrees and about 270 degrees.11. The disk drive of claim 1, wherein the arcuate raised portion subtends a central angle of about 360 degrees.12. The disk drive of claim 1, wherein the arcuate raised portion subtends a central angle of about 270 degrees.13. The disk drive of claim 1, further comprising a transition portion extending from the arcuate raised portion of the base, the transition portion configured to move airflow in a generally laminar fashion onto or off of the arcuate raised portion.14. The disk drive of claim 13, wherein the transition portion comprises a linear side profile.15. A disk drive comprising:an enclosure having a cover and a base; a spindle motor assembly mounted on the enclosure, the spindle motor assembly including a hub that is rotatable with respect to the enclosure; a disk mounted on the hub, the disk having a first surface, a second surface, an inner circumferential portion, an outer circumferential portion, and an outer periphery, the first surface being substantially parallel to a portion of the base located beneath the first surface and radially between the hub of the spindle motor assembly and a projection of the outer periphery, the base and the first surface of the disk defining a first airflow chamber, the second surface of the disk defining a boundary of a second airflow chamber; and an airflow constrictor comprising a first arcuate portion and a second portion, the first arcuate portion being generally parallel to the hub and spaced radially outwardly therefrom, the second portion being generally perpendicular to the first arcuate portion and extending radially inwardly from the first arcuate portion of the airflow constrictor, the second portion of the airflow constrictor subjacent only a portion of the outer circumferential portion of the disk and subtending a central angle of at least about 180 degrees, the airflow constrictor limiting airflow between the first airflow chamber and the second airflow chamber. 16. A disk drive comprising:an enclosure having a cover and a base; a spindle motor assembly mounted on the enclosure, the spindle motor assembly including a hub that is rotatable with respect to the enclosure; a disk mounted on the hub, the disk having a first surface, a second surface, and an outer periphery, the first surface being substantially parallel to a portion of the base located beneath the first surface and radially between the hub of the spindle motor assembly and a projection of the outer periphery, the base and the first surface of the disk defining a first airflow chamber having a first airflow chamber inlet, the second surface of the disk defining a boundary of a second airflow chamber having a second airflow chamber inlet; and an airflow constrictor subtending a central angle of at least about 180 degrees and having a surface substantially parallel to the first surface of the disk, the airflow constrictor at least partially located in the first airflow chamber inlet, the airflow constrictor limiting airflow between the first airflow chamber and the second airflow chamber. 17. The disk drive of claim 16, wherein the disk further comprises an inner circumferential portion and an outer circumferential portion, the airflow constrictor further comprises a first arcuate portion and a second portion, the first arcuate portion being generally parallel to the hub and spaced radially outwardly therefrom, the second portion of the airflow constrictor being generally perpendicular to the first arcuate portion and extending radially inwardly from the first arcuate portion of the airflow constrictor subjacent only a portion of the outer circumferential portion of the disk, the airflow constrictor proximate at least the outer circumferential portion of the disk.18. A disk drive comprising:an enclosure having a cover and a base, the base comprising: an actuator arm movement area comprising a first level having a first elevation, and a disk assembly mounting area comprising a second level extending around at least about 180 degrees of the disk assembly mounting area, the second level having a second elevation; a spindle motor assembly mounted on the enclosure, the spindle motor assembly including a hub that is rotatable with respect to the enclosure; a disk assembly mounted on the hub in the disk assembly mounting area, the disk assembly comprising a disk having a first surface and an outer periphery; a first clearance distance defined between the first surface of the disk and the first level of the actuator arm movement area of the base; and a second clearance distance defined between the first surface of the disk and the second level of the disk assembly mounting area of the base, the second clearance distance being less than the first clearance distance, wherein the second level and a portion of the first level located beneath the first surface and radially between the hub of the spindle motor assembly and a projection of the outer periphery are substantially parallel to the first surface. 19. The disk drive of claim 18, wherein the first surface of the disk further comprises an inner circumferential portion and an outer circumferential portion, the disk assembly mounting area further comprises an outer perimeter, an inner portion, and a third level having a third elevation, the third level extending around a portion of the inner portion of the disk assembly mounting area, the second level extending around a portion of the outer perimeter of the disk assembly mounting area, the third level being spaced farther from the disk than the second level.20. The disk drive of claim 19, wherein the base further comprises a disk shroud, the second level extending from the disk shroud to a location subjacent at least a portion of the outer circumferential portion of the disk.21. The disk drive of claim 18, wherein the first surface of the disk further comprises an inner circumferential portion and an outer circumferential portion, the disk assembly mounting area further comprises an outer perimeter, an inner portion, and a third level having a third elevation, the third level extending around a portion of the outer perimeter of the disk assembly mounting area, the second level extending around a portion of the inner portion of the disk assembly mounting area, the third level being farther from the disk than the second level.22. The disk drive of claim 18, wherein the base further comprises a transition portion extending between the second level of the base and the first level of the base, the transition portion configured to move airflow in a generally laminar fashion between the second level and the first level.23. The disk drive of claim 22, wherein the transition portion comprises a linear side profile.24. The disk drive of claim 18, wherein the base further comprises a disk shroud, the second level extending from the disk shroud to a location subjacent at least a portion of the outer circumferential portion of the disk.