Injecting processing fluid while writing data

1. A fluid injector in a device that rotates a disc stack, the fluid injector comprising a nozzle defining a plurality of outlets that direct processing fluid from the nozzle to the disc stack, at least some of the plurality of outlets are each aligned with a space between adjacent discs of the disc stack, wherein a first outlet of the plurality is sized larger than a second outlet of the plurality to provide a substantially different flow rate from the first outlet compared to that of the second outlet.

2. The fluid injector of claim 1 wherein the disc stack includes first and second discs positioned at longitudinally opposing ends of the disc stack, and wherein the second outlet directs a maximum flow rate of the processing fluid from the nozzle into a space adjacent a storage surface of the first disc and the first outlet directs a minimum flow rate of the processing fluid from the nozzle into a space adjacent a storage surface of the second disc.

3. The fluid injector of claim 1 wherein the plurality of outlets are sized to direct an incrementally decreasing flow rate of the processing fluid along the nozzle.

4. The fluid injector of claim 1 wherein each of the plurality of outlets is aligned with a space adjacent a storage surface of a respective disc of the disc stack.

5. The fluid injector of claim 1 wherein the nozzle defines a deflector that apportions an individual flow of the processing fluid entering an inlet of the nozzle into a desired varying flow profile leaving the plurality of outlets.

6. The fluid injector of claim 1 further comprising a flow control device having a sensor coupled to a controller to selectively regulate a flow rate with which the processing fluid enters the nozzle from a supply of the processing fluid.

7. The fluid injector of claim 6 wherein the sensor is responsive to changes in temperature.

8. The fluid injector of claim 6 wherein the sensor is responsive to changes in an observed data transfer error rate.

9. The fluid injector of claim 1 wherein the second outlet directs a higher flow rate of the processing fluid than the first outlet.

10. A method comprising:

rotating a disc stack;

supplying a processing fluid to a fluid injector having a nozzle defining a plurality of outlets that direct the processing fluid from the to the disc stack, wherein a first outlet of the plurality is sized larger than a second outlet of the plurality to provide a substantially different flow rate from the first outlet compared to that of the second outlet; and

sensing a temperature within the disc stack and responsively regulating a flow rate with which the processing fluid enters the nozzle.

11. The method of claim 10 wherein the second outlet directs a higher flow rate of the processing fluid than the first outlet.

12. The method of claim 10 wherein the supplying step is characterized by directing an incrementally decreasing flow rate of the processing fluid along the nozzle.

13. The method of claim 10 wherein the supplying step is characterized by some of the plurality of outlets being each aligned with spaces between adjacent discs in the disc stack.

14. The method of claim 10 wherein the supplying step is characterized by a deflector apportioning an individual flow of the processing fluid entering an inlet of the nozzle into a desired varying flow profile leaving the nozzle.

15. A data writing device, comprising:

a spindle operably supporting a disc stack in a data transfer relationship with a plurality of data transfer members; and

means for controlling part-to-part positional variation among different data transfer members of the plurality in relation to respective storage locations of the disc stack by substantially equalizing environmental temperatures in spaces adjacent the discs in the disc stack where the data transfer members reside in response to thermal excitation created by operating the writing device that heats the spaces at different rates.