Marker-zone to determine gross positioning on a reference surface of a media
View Patent ↗Template patterns in accordance with the present invention can include one or more marker-zones printed to a reference surface of a disk for determining gross-position along a stroke of a read head connected with a rotary actuator. The one or more marker-zones can be printed or otherwise written to a portion of the reference surfaces as one or more pulses. In one embodiment, each pulse can trace the motion of the stroke along at least a portion of the radius of the reference surface. A pulse can identify a marker-zone edge when a di-bit (a transition pair representing a pulse) disappears at some radius from center of the disk. At a radius closer to the center of the disk, the di-bit can abruptly reappear so that the pulse is continued. The interruption in the radial continuity of the magnetized pulse defines the marker-zone and can be any length.
1. A marker-zone to determine a position of a head on a printed media having a plurality of chevrons for use in self-servo writing of a data storage device, comprising:
a transition-pair extending radially over a portion of the printed media;
wherein the transition-pair is arranged substantially perpendicular to the head at a location radially coincident with the head when the head is disposed over the transition-pair;
an edge defined by a radial transition from a presence of the transition-pair to an absence of the transition-pair;
wherein the edge defines a gross radial position; and
wherein the edge circumferentially precedes one or more of the plurality of chevrons.
2. The marker-zone of claim 1 , wherein the one or more chevrons are a zig-burst and a zag-burst.
3. A template pattern to determine a position of a head on a printed media for use in self-servo writing of a data storage device, comprising;
a plurality of chevrons;
a plurality of pulses preceding the plurality of chevrons, the plurality of pulses extending radially across a portion of said printed media;
wherein the plurality of pulses are arranged generally perpendicular to a direction of travel the head at a location radially coincident with the head when the head is disposed over the plurality of pulses;
wherein at least one of the plurality of pulses includes a gap such that the pulse is radially discontinuous;
wherein the gap includes an edge defined by a radial transition from a presence of the pulse to an absence of the pulse; and
wherein the position is determined by a location of said head relative to the edge.
4. The template pattern of claim 3 , wherein the gap includes a first edge and a second edge.
5. The template pattern of claim 3 , wherein said position includes a gross position and a fine position;
wherein the gross position is determined by the location relative to the edge; and
wherein the fine position is determined by a phase of at least one of the plurality of chevrons at the location.
6. The template pattern in claim 5 , wherein the at least one of the plurality of chevrons at the location comprises one or both of a zig-burst and a zag-burst.
7. The template pattern of claim 3 , wherein the plurality of chevrons comprises one or both of a plurality of zig-bursts and a plurality of zag-bursts.
8. The template pattern of claim 3 , wherein the head is a read head.
9. The template pattern of claim 3 , wherein the head is an MR head.
10. A pattern to determine a position of a head on a media, comprising:
a plurality of pulses extending radially along a surface of said media, at least one of the plurality of pulses including a gap such that the pulse is radially discontinuous;
wherein the gap includes an edge defined by a radial transition from a presence of the pulse to an absence of the pulse; and
a plurality of chevrons located such that a portion at least one of the plurality of chevrons is located at each point along a radius of the surface;
wherein said position is determined by a location of said head relative to the edge.
11. The pattern of claim 10 , wherein the gap includes a first edge and a second edge.
12. The pattern of claim 11 , wherein said position includes a gross position and a fine position;
wherein the gross position is determined by the location relative to one or both of the first edge and the second edge; and
wherein the fine position is determined by a phase of at least one of the plurality of chevrons at the location.
13. The template pattern of claim 12 , wherein the at least one of the plurality of chevrons at the location comprises one or both of a zig-burst and a zag-burst.
14. The template pattern of claim 10 , wherein the plurality of chevrons comprises one or both of a plurality of zig bursts and a plurality of zag-bursts.
15. The template pattern of claim 10 , wherein the head is a read head.
16. The template pattern of claim 10 , wherein the head is an MR head.
17. A data storage system having a rotatable medium for storing data, comprising:
a housing;
a spindle connected with the housing, said rotatable medium being connected with the spindle;
an actuator connected with the housing;
a head connected with the actuator such that the head can be positioned over a surface of the rotatable medium;
wherein the surface includes a pattern to self-servo write said rotatable medium, the pattern having;
a plurality of pulses extending radially along the surface, at least one of the plurality of pulses including a gap such that the pulse is radially discontinuous;
wherein the gap includes an edge defined by a radial transition from a presence of the pulse to an absence of the pulse; and
a plurality of chevrons located such that a portion at least one of the plurality of chevrons is located at each point along a radius of the surface;
wherein a position of the head can be determined by a location of the head relative to the edge.
18. The system of claim 17 , wherein the gap includes a first edge and a second edge.
19. The system of claim 18 , wherein said position includes a gross position and a fine position;
wherein the gross position is determined by the location relative to one or both of the first edge and the second edge; and
wherein the fine position is determined by a phase of at least one of the plurality of chevrons at the location.
20. The system of claim 19 , wherein the at least one of the plurality of chevrons at the location comprises one or both of a zig-burst and a zag-burst.
21. The template pattern of claim 17 , wherein the plurality of chevrons comprises one or both of a plurality of zig-bursts and a plurality of zag-bursts.
22. The template pattern of claim 17 , wherein the head is read head.
23. The template pattern of claim 17 , wherein the head is an MR head.