Flow divider upstream of disc drive recirculation filter

1. A disc drive comprising:

a housing enclosing a spindle motor operable to spin a disc;

a filter within the housing, wherein the filter is positioned so that a filter stream of moving gas created by a spinning motion of the disc flows through the filter; and

a flow divider secured to a portion of the housing and positioned within the filter stream upstream of the filter, wherein the flow divider splits the filter stream into a first branch and a second branch, both flowing through the filter, and wherein the flow divider has a shape that increases the flow of gas through the filter.

2. The disc drive of claim 1 , wherein the first branch and the second branch are separate as they enter the filter.

3. The disc drive of claim 1 , wherein the filter compromises a single filter element.

4. The disc drive of claim 1 , wherein:

the housing comprises a base and a cover; and

the flow divider is secured to the base.

5. The disc drive of claim 4 , wherein a bottom edge of the flow divider is secured to the base and a top edge of the flow divider is positioned adjacent to the cover.

6. The disc drive of claim 4 , wherein the flow divider and the base form a unitary member.

7. The disc drive of claim 6 , wherein the unitary member comprises aluminum.

8. The disc drive of claim 1 , wherein a first flow rate of the first branch is substantially the same as a second flow rate of the second branch.

9. The disc drive of claim 1 , wherein a trailing edge of the flow divider adjacent the filter divides the filter into a first filter zone receiving the first branch and a second filter zone receiving the second branch, the first filter zone and the second filter zone each having substantially the same amount of filter area.

10. The disc drive of claim 1 , wherein the filter extends a substantially radial direction relative to the disc.

11. The disc drive of claim 1 , wherein the flow divider comprises a first vane separating the first branch of the filter stream from the second branch of the filter stream and a second vane separating the second branch of the filter stream from a third branch of the filter stream.

12. The disc drive of claim 1 , wherein at least a portion of the flow divider is positioned beneath or above the disc.

13. A disc drive comprising:

a housing comprising a base and a top cover secured to the base, the housing enclosing a spindle motor spinning a disc;

a filter within the housing adjacent the disc, the filter positioned to that a gaseous filter stream created by the spinning disc flows through the filter; and

a first vane secured to a portion of the housing and positioned within the filter stream upstream of the filter, the first vane splitting the filter stream into a first branch and a second branch, both flowing through the filter.

14. The disc drive of claim 13 , wherein the first branch and the second branch an separate as they pass through the filter.

15. The disc drive of claim 13 , wherein the filter comprises a single filter element.

16. The disc drive of claim 13 , wherein a bottom edge of the first vane is secured to the base and a top edge of the first vane is positioned adjacent the cover.

17. The disc drive of claim 16 , wherein the first vane and the base form a unitary member.

18. The disc drive of claim 17 , wherein the unitary member comprises aluminum.

19. The disc drive of claim 13 , wherein a trailing edge of the first vane is adjacent the filter the divides the filter into a first filter zone receiving the first branch and a second filter zone receiving the second branch, the first filter zone and the second filter zone each comprising substantially the same amount of filter area.

20. The disc drive of claim 13 , further comprising a second vane secured to the housing adjacent the first vane, the second vane separating the second branch of the filter stream from a third branch of the filter stream.

21. The disc drive of claim 13 , wherein the first vane is curved and at least a portion of the first vane is positioned beneath or above the disc.

22. The disc drive of claim 13 , wherein a first flow rate of the first branch is substantially the same as a second flow rate of the second branch.

23. A disc drive comprising:

a housing enclosing a spindle motor spinning a disc and a filter adjacent the disc, the filter positioned so that a gaseous filter stream created by the spinning disc flows through the filter; and

means for minimizing turbulence in the filter stream upstream of and adjacent to the filter.

24. The disc drive of claim 23 , wherein the means for minimizing turbulence comprises a van dividing the filter stream upstream of the filter into a first branch and a second branch, wherein the first branch and the second branch both flow through the filter.

25. The disc drive of claim 24 , wherein:

the housing comprises a base and a cover; and

the vane is secured to the base.

26. The disc drive of claim 25 , wherein a bottom edge of the vane is secured to the base and a top edge of the vane is positioned adjacent to the cover.

27. The disc drive of claim 24 , wherein a trailing edge of the vane is adjacent the filter and divides the filter into a first filter zone receiving a first stream and a second filter zone receiving a second stream, the first filter zone and the second filter zone each comprising substantially the same amount of filter area.

28. The disc drive of claim 24 , wherein the first branch and the second branch are divided until they pass through the filter.

29. The disc drive of claim 24 , wherein a first flow rate of the first branch is substantially the same as a second flow rate of the second branch.