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A cooling system for a data storage assembly having multiple disk drives disposed on a replaceable module. Air is drawn into a housing for the data storage assembly and through a planar array of disk drives, through a set of blowers and across a set of power supplies. Plenums are provided on top of

A cooling system for a data storage assembly having multiple disk drives disposed on a replaceable module. Air is drawn into a housing for the data storage assembly and through a planar array of disk drives, through a set of blowers and across a set of power supplies. Plenums are provided on top of and below the disk drives and the blowers. Air flowing through the array of disk drives only flows across a single layer of disk drives.

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1. A disk drive assembly, comprising:a housing having a plurality of walls;a first portion of the housing forming an upper air plenum having a plurality of intake vents;a plurality of disk drives disposed within a second portion of the housing, a first plurality of air flow paths being defined aroun

1. A disk drive assembly, comprising:a housing having a plurality of walls;a first portion of the housing forming an upper air plenum having a plurality of intake vents;a plurality of disk drives disposed within a second portion of the housing, a first plurality of air flow paths being defined around the disk drives, the first and second portion of the housing being separated by an upper wall having at least one air plenum port above each of the plurality of disk drives;a lower wall separating the second portion of the housing and a third portion of the housing, the lower wall having at least one air plenum port below each of the plurality of disk drives;a plurality of blowers disposed within the third portion of the housing, the blowers drawing air through the upper air plenum, into the air flow paths and into a fourth portion of the housing; andat least one power supply disposed within the fourth portion of the housing, the at least one power supply defining a second plurality of air flow paths around the power supply down stream from the plurality of blowers. 2. The disk drive assembly of claim 1 wherein the housing has intake openings in at least some of the walls through which air is drawn into the housing and exhaust openings through which air exits the housing. 3. The disk drive assembly of claim 1 wherein a plurality of the disk drives are mounted on each of a plurality of printed circuit boards in the second portion of the housing, the third portion of the housing spanning a first side of the second portion of the housing to allow air to be drawn from a second side of the second portion of the housing across a single disk drive and into the third portion of the housing by the plurality of blowers. 4. The disk drive assembly of claim 1 wherein the disk drives are mounted on each of a plurality of printed circuit boards, the disk drives having a data storage disk rotatably mounted in the disk drive for rotation in a plane, the disk drives each being attached to a printed circuit board with an air flow path being defined on both sides of the disk parallel to the plane. 5. The disk drive assembly of claim 1 wherein the plurality of blowers are disposed on a series of modular racks, the second and third portions of the housing having a common side through which the blower draws air from the second portion of the housing and into the third portion of the housing. 6. The disk drive assembly of claim 1 wherein the plurality of disk drives are mounted on each of a plurality of printed circuit boards, the plurality of blowers are disposed on a series of modular racks, and the plurality of printed circuit boards and the series of modular racks are independently removable from a front side of the housing. 7. A multiple disk drive storage apparatus, comprising:a housing;a first portion of the housing forming an upper air plenum;a second portion of the housing separated from the first portion of the housing by an upper wall having a plurality of upper air plenum ports;a plurality of disk drives arranged within the second portion of the housing with a portion of the disk drives being secured to one of a first plurality of carriers, the disk drives being arranged in a single plane;a third portion of the housing forming a midair plenum, the second and third portions of the housing separated by a lower wall having a plurality of lower air plenum ports;a plurality of blowers arranged within the third portion of the housing with each of the blowers being secured to one of a second plurality of carriers, the third portion of the housing having a side through which air is drawn that spans a side of the second portion of the housing that is parallel to the plane in which the disk drives are disposed, wherein air is drawn transversely across the planar arrangement of disk drives so that air flowing across one disk drive does not flow substantially across another disk drive. 8. The multiple disk drive storage apparatus of claim 7 further com prising a fourth portion of the housing containing at least one power supply, the fourth portion of the housing receiving air after the air has passed through the upper air plenum, the second portion of the housing, the third portion of the housing, and a lower air plenum below the plurality of blowers. 9. The multiple disk drive storage apparatus of claim 8 wherein the first portion of the housing has intake openings through which air is drawn into the housing and the fourth portion of the housing has exhaust openings through which air exits the housing. 10. The multiple disk drive storage apparatus of claim 7 wherein the disk drives are mounted on plurality of printed circuit boards, the disk drives having a data storage disk rotatably mounted in the disk drive for rotation in a plane, the disk drives each being attached to a printed circuit board with an air flow path being defined on both sides of the disk parallel to the plane. 11. The disk drive assembly of claim 7 wherein the first plurality of carriers and the second plurality of carriers are independently removable from a front side of the housing. 12. A cooling system for a data storage system comprising:a housing having air intake vents through which air is drawn into an air intake plenum;a plurality of disk drives disposed in the housing, the plurality of disk drives assembled in modular subassemblies, wherein the air intake plenum is located above the disk drives;a plurality of blowers drawing air from the air intake plenum past the disk drives and into an intermediate plenum located between the plurality of disk drives and the plurality of blowers, the blowers assembled together in modular subassemblies;a plurality of power supplies disposed in the housing, the blowers drawing air from the intermediate plenum through the blowers to a lower plenum located between the blowers and the power supplies;the housing having exhaust ports through which air is exhausted after passing through the power supplies;wherein the modular assemblies of the disk drives and the modular assemblies of the blowers are independently removable from the housing by sliding through different holes in the housing. 13. The cooling system of claim 12 wherein the air intake vents are formed in a front wall, two side walls and a rear wall. 14. The cooling system of claim 12 wherein the intermediate plenum is located below the disk drives and above the blowers. 15. The cooling system of claim 12 wherein the lower plenum is located below the blowers. 16. The cooling system of claim 12 wherein the power supplies are located in a rear portion of the housing behind the blowers and the plurality of disk drives. 17. The cooling system of claim 12 wherein the disk drives have a rotatable disk for data storage that rotates in a plane that is perpendicular to the air intake plenum and the intermediate plenum. 18. The cooling system of claim 12 wherein air passages are provided for air to be drawn across two sides of the disk drives on opposite sides of the plane in which the rotatable disks rotate.