Fly height adjusted sweep cycle for a disc drive
View Patent ↗A method of reducing read/write head wear and disc wear through controlling fly height of the read/write head to improve reliability of a disc drive is disclosed. Absent data transfer operations, a fly height adjusted sweep cycle routine executes a sweep cycle sub-routine that positions the read/write head at an inner most data track, lowers the fly height of the read/write head and performs a seek to the outer most data track to sweep debris from a recording surface and then raises the fly height above an operating fly height for the read/write head, oscillates the read/write head to dislodge debris accumulated on the read/write head and holds the read/write head at the raised fly height while awaiting a new data transfer operation.
1. A method comprising:
raising a fly height of a transducer to a maximum setting at a radial position;
moving the transducer unidirectionally while substantially at the maximum fly height to a beginning position; and
lowering the transducer to a minimum fly height at the beginning position and executing a move cycle routine moving the transducer unidirectionally away from the beginning position while remaining substantially at the minimum fly height.
2. A data storage device comprising:
a transducer and a storage medium positionable along two dimensions with respect to each other in a data transfer relationship; and
a control element executing a move cycle routine by steps for associating a spatial separation between the transducer and the storage medium in relation to a direction of moving the transducer across the storage medium.
3. The data storage device of claim 2 , in which the steps for associating are characterized by moving the transducer to a beginning position of a move cycle while at a fly height that is greater than a nominal fly height.
4. The data storage device of claim 3 , in which the steps for associating are characterized by executing the move cycle with the transducer at a fly height that is less than the nominal fly height.
5. The data storage device of claim 4 , in which the steps for associating are characterized by the move cycle moving the transducer from an innermost portion to an outermost portion of the storage medium while at a fly height that is less than the nominal fly height.
6. The data storage device of claim 5 , in which the steps for associating are characterized by the transducer dwelling at each of a plurality of data storage tracks during the move cycle.
7. The data storage device of claim 6 wherein the steps for associating are characterized by the transducer dwelling at a selected data storage track for less than one complete revolution of the data storage track during the move cycle.
8. The data storage device of claim 6 wherein the steps for associating are characterized by the transducer dwelling at a selected data storage track for at least one complete revolution of the data storage track during the move cycle.
9. The data storage device of claim 5 wherein the steps for associating are characterized by oscillating the transducer while at a fly height that is greater than the nominal fly height subsequent to completing the move cycle.
10. The data storage device of claim 5 wherein the steps for associating are characterized by moving the transducer to the nominal fly height subsequent to completing the move cycle.
11. An apparatus comprising circuitry configured to spatially separate a transducer from a storage medium by a first separation that is greater than a nominal data transfer separation, to thereafter move the transducer adjacent a selected portion of the storage medium at the first separation, to thereafter lower the transducer to a second separation that is less than the nominal data transfer separation, and to thereafter move the transducer across the storage medium at the second separation.
12. The apparatus of claim 11 wherein the circuitry is configured such that the first separation is associated with a maximum operable data transfer separation.
13. The apparatus of claim 12 wherein the circuitry is configured such that the second separation is associated with a minimum operable data transfer separation.
14. The apparatus of claim 13 wherein the circuitry is configured such that the second separation is substantially thirty percent greater than the minimum operable data transfer separation.
15. The apparatus of claim 13 wherein the circuitry is configured such that the transducer seeks from an outer track to an inner track of a rotating disc data storage medium at the first separation.
16. The apparatus of claim 15 wherein the circuitry is configured such that the transducer seeks from the inner track to an outer track of the rotating disc data storage medium at the second separation.
17. The apparatus of claim 16 wherein the circuitry is configured further to move the transducer from the second separation to the first separation subsequent to seeking to the outer track.
18. The apparatus of claim 17 wherein the circuitry is configured further to oscillate the transducer at the first separation subsequent to seeking to the outer track.
19. The apparatus of claim 18 wherein the circuitry is configured to oscillate the transducer by a series of short seeks.
20. The apparatus of claim 16 wherein the circuitry is configured further to move the transducer from the second separation to the nominal separation subsequent to seeking to the outer track.