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A power supply module supplies power to a power bus. The module includes a module casing. Within the module casing is a power supply and a means for cooling the power supply. The power bus supplies power to the means for cooling the module as well as to other devices connected to the power bus. Mult

A power supply module supplies power to a power bus. The module includes a module casing. Within the module casing is a power supply and a means for cooling the power supply. The power bus supplies power to the means for cooling the module as well as to other devices connected to the power bus. Multiple power supply modules are included in a disk drive array system. Each module provides power to the power bus and to each means for cooling. Upon failure of one of the power supplies, the other of the power supplies will provide power to each device connected to the power bus, including the means for cooling the failed power supply.

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1. A power supply module for supplying power to a power bus, the power supply module comprising: (a) a module casing; (b) a power supply positioned within the module casing; (c) cooling means positioned within the module casing for providing cooling; (d) means for conducting power from the pow

1. A power supply module for supplying power to a power bus, the power supply module comprising: (a) a module casing; (b) a power supply positioned within the module casing; (c) cooling means positioned within the module casing for providing cooling; (d) means for conducting power from the power supply to the power bus; and, (e) means for drawing power from the power bus for supplying the cooling means. 2. The power supply module of claim 1 wherein the cooling means includes at least one fan. 3. The power supply module of claim 2 wherein the cooling means further includes at least one redundant fan. 4. The power supply module of claim 1 wherein the means for conducting power includes conductors having first and second ends, the first ends of the conductors connected to the power supply, the second ends of the conductors connected to the power bus, wherein the conductors pass through the module casing. 5. The power supply module of claim 1 wherein the means for drawing power includes conductors having first and second ends, the first ends of the conductors connected to the power supply, the second ends of the conductors connected to the power bus, wherein the conductors pass through the module casing. 6. A power supply system comprising: (a) a power bus; and, (b) a plurality of power supply modules, each power supply module including: (i) a module casing; (ii) a power supply positioned within the module casing; (iii) cooling means positioned within the module casing for providing cooling; (iv) means for conducting power from the power supply to the power bus; and, (v) means for drawing power from the power bus for supplying the cooling means. 7. The power supply module of claim 6 wherein the cooling means includes at least one fan. 8. The power supply module of claim 7 wherein the cooling means further includes at least one redundant fan. 9. The power supply module of claim 6 wherein the means for conducting power includes conductors having first and second ends, the first ends of the conductors connected to the power supply, the second ends of the conductors connected to the power bus, wherein the conductors pass through the module casing. 10. The power supply module of claim 6 wherein the means for drawing power includes conductors having first and second ends, the first ends of the conductors connected to the power supply, the second ends of the conductors connected to the power bus, wherein the conductors pass through the module casing. 11. A disk drive array system comprising: (a) a power bus; and (b) at least one disk drive connected to the power bus for drawing power from the power bus; (c) at least two power supply modules each power supply module connected to the power bus for supplying power to the power bus, each power supply module having a means for cooling the disk drive array system, wherein each means for cooling is connected to the power bus for drawing power from the power bus. 12. The disk drive array system of claim 11 further including a fan module for cooling the disk drive array system, the fan module connected to the power bus for drawing power from the power bus. 13. The disk drive array system of claim 11 wherein each means for cooling the disk drive array system includes at least one fan positioned within each power supply module. 14. The disk drive array system of claim 13 wherein the means for cooling each power supply module further includes at least one redundant fan positioned within each power supply module. 15. The disk drive array system of claim 11 further including at least one redundant power supply module.