Method and apparatus reducing flying height drop in a hard disk drive under humid conditions
A slider with an intake heater near front edge heating air passing between air bearing surface and rotating disk surface to reduce change in flying height caused by water condensation. Method of operating the slider. Head gimbals assembly including slider. Head stack assembly including at least one HGA. Operating hard disk drive by receiving temperature and humidity reading to determine heater control and asserting heater control to stimulate intake heater to heat air. Embedded processor directing hard disk drive at least partly implementing operations. Embedded circuit including embedded processor. A hard disk drive including temperature, humidity sensors, embedded circuit and head stack assembly. Manufacturing methods for slider, head gimbals assembly, head stack assembly, embedded processor, embedded circuit and hard disk drive, and these items as products of their manufacturing processes.
1. A method of operating a slider near a rotating disk surface in a hard disk drive, comprising the steps:
heating air near a front edge of said slider moving between an air bearing surface of said slider and said rotating disk surface to increase the temperature of said air; and
said increase of said temperature of said air between said air bearing surface and said rotating disk surface reducing the drop in flying height of the trailing edge of said slider to said rotating disk surface.
2. The slider implementing the method of claim 1 , comprising:
means for heating air moving between said air bearing surface of said slider and said rotating disk surface to increase the temperature of said air.
3. The slider of claim 2 , wherein said means for heating, comprising:
an intake heater near a front edge of said slider for heating said air moving between said air bearing surface and said rotating disk surface.
4. The slider of claim 3 , further comprising: a thermal insulator to direct said heat toward an intake formed by said front edge and said rotating disk surface.
5. The slider of claim 2 , further comprising: an air bearing surface with at least one pad with diamond like carbon.
6. A method of manufacturing said slider of claim 2 , comprising the step: forming said means for heating to create said slider.
7. The method of claim 6 , further comprising the step: forming a thermal insulator near a front end to further create said slider.
8. The method of claim 6 , wherein the step forming said means for heating, further comprises the step: forming said intake heater near said front edge to create said slider.
9. The slider as a product of the process of claim 6 .
10. The slider comprising:
an intake heater near a front edge of said slider for heating said air moving between an air bearing surface and a rotating disk surface in a hard disk drive, whereby
said increase of said temperature of said air between said air bearing surface and said rotating disk surface reducing the drop in flying height of the trailing edge of said slider to said rotating disk surface.
11. The slider of claim 10 , further comprising: a thermal insulator near said intake heater to direct said heat from said intake heater toward an intake formed by said front edge and said rotating disk surface.
12. The slider of claim 10 , further comprising: an air bearing surface with at least one pad with diamond like carbon.
13. A method of manufacturing said slider of claim 10 , comprising the step: forming said intake heater near said front edge to create said slider.
14. The method of claim 13 further comprising the step: forming a thermal insulator near said intake heater to further create said slider.
15. The slider as a product of the process of claim 13 .
16. A head gimbal assembly, including said slider of claim 10 coupling through a flexure finger to a load beam.
17. A method of manufacturing said head gimbals assembly of claim 16 , comprising the step:
coupling said slider through said flexure finger to said load beam to create said head gimbals assembly.
18. A head stack assembly for use in said hard disk drive, comprising: a head stack coupled to at least one of said head gimbals assemblies of claim 16 .
19. A method of manufacturing said head stack assembly of claim 18 , comprising the step: coupling said head gimbal assemblies to said head stack to create said head stack assembly.
20. The head stack assembly as a product of the process of claim 19 .
21. A method of operating said hard disk drive using said head stack assembly of claim 18 , comprising the steps:
receiving a temperature reading from a temperature sensor and a humidity reading from a humidity sensor, both included in said hard disk drive;
determining a heater control signal based upon said temperature reading and said humidity reading; and
asserting said heater control signal to create a heating control stimulating said intake heater to heat said air passing between said front edge of said slider and said rotating disk surface.
22. An embedded circuit for directing operation of said hard disk drive to implement the method of claim 21 , comprising:
an embedded processor receiving said temperature reading and said humidity reading; and
said embedded processor determining said heater control signal based upon said temperature reading and said humidity reading.
23. The embedded processor of claim 22 , comprising: at least one instance of a controller;
wherein each of said controllers included in said embedded processor,
said controller receives at least one input,
said controller maintains and updates at least one state, and
said controller generates at least one output based upon at least one member of a group consisting of: said inputs and said states;
wherein at least one of said states of at least one of said controllers includes at least one member of the group consisting of a non-redundant digital representation, a redundant digital representation, and an analog representation.
24. The embedded processor of claim 23 , further comprising:
means for receiving said temperature reading and said humidity reading; and
means for determining said heater control signal based upon said temperature reading and said humidity reading.
25. The embedded circuit of claim 24 , further comprising:
means for asserting said heater control signal to create said heating control stimulating said intake heater to heat said air passing between said front edge of said slider and said rotating disk surface.
26. The embedded controller of claim 25 , wherein at least one member of the means group includes at least one instance of a member of the group consisting of the members:
a computer accessibly coupled to a memory and directed by a program system including program steps residing in said memory; wherein said computer includes at least one data processor and at least one instruction processor; wherein each of said data processors is directed by at least one of said instruction processors;
a finite state machine;
an inferential engine; and
a neural network;
wherein said means group, consists of the members: said means for receiving, said means for determining, and said means for asserting.
27. The program system of claim 26 , comprising at least one of the program steps:
receiving said temperature reading and said humidity reading;
determining said heater control signal based upon said temperature reading and said humidity reading; and
asserting said heater control signal.
28. The program system of claim 27 , further comprising each of said steps:
receiving said temperature reading and said humidity reading;
determining said heater control signal based upon said temperature reading and said humidity reading; and
asserting said heater control signal.
29. The hard disk drive using said embedded circuit of claim 22 , comprising:
said temperature sensor and said humidity sensor sensor-coupled to said embedded circuit; and
said embedded circuit coupled to said head stack assembly to provide said heating control to said intake heater to heat said air passing between said front edge of said slider and said rotating disk surface.
30. The hard disk drive of claim 29 , wherein said head stack assembly includes said means for asserting said heater control signal to create said heating control provided to said intake heater.
31. A method of manufacturing said hard disk drive of claim 29 , comprising the steps:
sensor-coupling said temperature sensor and said humidity sensor with said embedded circuit to create said temperature sensor and said humidity sensor sensor-coupled to said embedded circuit;
coupling said embedded circuit to said head stack assembly for providing said heating control to create said hard disk drive.
32. The hard disk drive as a product of the process of claim 31 .