Null servo pattern for bitpatterned media
Null servo pattern for bitpatterned media
 CN 101,430,887 A
 Filed: 09/12/2008
 Published: 05/13/2009
 Est. Priority Date: 09/12/2007
 Status: Active Application
First Claim
Patent Images
1. , a kind of patterning recording medium comprises:
 First fragment comprises first row and the second discrete magnetic element of going that are separated by nonmagnetic substance, and the nonmagnetic substance of delegation between described first row and second row, andBe formed at the first empty graph case in described first fragment, comprise;
Continuous group of discrete magnetic element described in first row of described first fragment, in described first row every group have with this first row in the opposite magnetic polarity of polarity of adjoining groups;
AndContinuous group of discrete magnetic element described in second row of described first fragment, in described second row every group have with this second row in the opposite magnetic polarity of polarity of adjoining groups.
Chinese PRB Reexamination
Abstract
A patterned recording media comprises a segment and a null pattern formed in the segment. The segment comprises first and second rows of discrete magnetic elements separated by a nonmagnetic material, and a row of nonmagnetic material positioned between the first and second rows. The null pattern comprises consecutive groups of the discrete magnetic elements in the first and second rows of the segment. Each group in the first row has a magnetic polarity that is opposite the magnetic polarity of adjoining groups in the first row. Each group in the second row has a magnetic polarity that is opposite the magnetic polarity of adjoining groups in the second row.

1 Citation
Disk device  
Patent #
CN 112,309,437 A
Filed 01/17/2020

Current Assignee

No References
20 Claims

1. , a kind of patterning recording medium comprises:

First fragment comprises first row and the second discrete magnetic element of going that are separated by nonmagnetic substance, and the nonmagnetic substance of delegation between described first row and second row, and Be formed at the first empty graph case in described first fragment, comprise; Continuous group of discrete magnetic element described in first row of described first fragment, in described first row every group have with this first row in the opposite magnetic polarity of polarity of adjoining groups;
AndContinuous group of discrete magnetic element described in second row of described first fragment, in described second row every group have with this second row in the opposite magnetic polarity of polarity of adjoining groups.


2. media as claimed in claim 1 is characterized in that, further comprises:

Second fragment comprises first row and the second discrete magnetic element of going that are separated each other by nonmagnetic substance, and delegation is at first row of described second fragment and the nonmagnetic substance between second row; Be formed at the first empty graph case in described second fragment, comprise; Continuous group of discrete magnetic element described in first row of described second fragment, in first row of described second fragment every group have the opposite magnetic polarity of polarity of adjoining groups in first row with this second fragment;
AndContinuous group of discrete magnetic element described in second row of described second fragment, in second row of described second fragment every group have the opposite magnetic polarity of polarity of adjoining groups in second row with this second fragment; Second first group the magnetic polarity in capable of the first empty graph case of first group magnetic polarity and described first fragment in first row of the first empty graph case of wherein said second fragment is identical;
AndSecond the two adjacent delegation'"'"'s nonmagnetic substance of row with the first empty graph case of first row of the first empty graph case of described second fragment and described first fragment.


3. media as claimed in claim 1 is characterized in that, first row and second row of described first fragment circumferentially extend, and described first row is positioned in the different radial position of distance center axle with described second row.

4. media as claimed in claim 1 is characterized in that:

First row of the described first empty graph case and the discrete magnetic element of second row are stagger arrangement;
AndContinuous group in described first row and second row comprises first group separately, and first group magnetic polarity of wherein said first row is opposite with first group magnetic polarity of described second row.


5. media as claimed in claim 4 is characterized in that, further comprises the second empty graph case adjacent with the described first empty graph case, and the described second empty graph case comprises:

Continuous group of discrete magnetic element described in described first row, it comprises adjacent first group of last group in first row with the described first empty graph case, and every group magnetic polarity in first row of the described second empty graph case is opposite with polarity of adjoining groups in first row of this second empty graph case;
AndContinuous group of discrete magnetic element described in described second row, it comprises adjacent first group of last group in second row with the described first empty graph case, and every group magnetic polarity in second row of the described second empty graph case is opposite with polarity of adjoining groups in second row of this second empty graph case.


6. media as claimed in claim 5 is characterized in that, first group of the described second empty graph case has identical magnetic polarity.

7. media as claimed in claim 6 is characterized in that, first group magnetic polarity in first row of the described second empty graph case is opposite with the magnetic polarity of last group in first row of the described first empty graph case.

8. media as claimed in claim 6 is characterized in that, first group magnetic polarity in second row of the described second empty graph case is identical with the magnetic polarity of last group in second row of the described first empty graph case.

9. media as claimed in claim 1 is characterized in that:

The first described magnetic element capable and second row of the described first empty graph case is in alignment with each other diametrically, and this radial direction is crossed described first row and the second capable longitudinal direction that is extended in described first fragment;
AndContinuous group of described first row and second row comprises first group and last group separately, and first group magnetic polarity of wherein said first row is opposite with first group magnetic polarity of described second row.


10. media as claimed in claim 9 is characterized in that, described media further comprises the second empty graph case adjacent with the described first empty graph case, and the described second empty graph case comprises:

Continuous group of discrete magnetic element described in described first row, it comprises in first row with the described first empty graph case adjacent first group of last group, and the polarity of adjoining groups in first row of the described second empty graph case in first row of every group magnetic polarity and this second empty graph case is opposite;
AndContinuous group of discrete magnetic element described in described second row, it comprises in second row with the described first empty graph case adjacent first group of last group, and the polarity of adjoining groups in second row of the described second empty graph case in second row of every group magnetic polarity and this second empty graph case is opposite.


11. media as claimed in claim 10 is characterized in that, first group of the described second empty graph case has identical magnetic polarity.

12. media as claimed in claim 11 is characterized in that, first the magnetic polarity of last group in capable of first group magnetic polarity and the described first empty graph case in first row of the described second empty graph case is identical.

13. media as claimed in claim 12 is characterized in that, second the magnetic polarity of last group in capable of first group magnetic polarity and the described first empty graph case in second row of the described second empty graph case is opposite.

14. , a kind of patterning recording medium comprises:

The a plurality of patterning discrete magnetic elements that separate each other by nonmagnetic substance; Be positioned at a plurality of homocentric recorded segment in the different radial position of distance center axle separately, each fragment comprises the first homocentric row and the second discrete magnetic element of going that forms data sector and empty graph case, and described empty graph case comprises; Continuous group of discrete magnetic element described in first row of described fragment, in described first row every group magnetic element have with this first row in the opposite magnetic polarity of polarity of adjoining groups;
AndContinuous group of discrete magnetic element described in second row of described fragment, in described second row every group magnetic element have with this second row in the opposite magnetic polarity of polarity of adjoining groups.


15. media as claimed in claim 14 is characterized in that, first group magnetic polarity during first group magnetic polarity in described first row is capable with described second is opposite.

16. media as claimed in claim 14 is characterized in that, first row of described empty graph case and the described magnetic element of second row are stagger arrangement.

17. media as claimed in claim 14, it is characterized in that, described a plurality of discrete magnetic elements in first row of the empty graph case of a fragment have position, angle with respect to central shaft separately, and second one of the discrete magnetic element in capable of this position, angle and described empty graph case is identical.

18. , a kind of demodulation method of patterning media readback signal comprises:

The patterning that comprises fragment media is provided, and described fragment comprises the discrete formed empty graph case of magnetic element that is separated each other by nonmagnetic substance; Acquisition in response to reading head by described discrete magnetic element top generated the time become the sampling of readback signal, each sampling is corresponding to one of described magnetic element of described empty graph case;
AndGenerate the demodulation position signalling corresponding with respect to the position of described fragment based on described readback signal sampling with magnetic head.


19. method as claimed in claim 18 is characterized in that:

Described empty graph case comprises; Continuous group of discrete magnetic element described in first row of described fragment, every group magnetic element have with this first row in the opposite magnetic polarity of polarity of adjoining groups;
AndContinuous group of discrete magnetic element described in second row of described fragment, in described second row every group magnetic element have with this second row in the opposite magnetic polarity of polarity of adjoining groups; Wherein; First row and second row of described empty graph case are stagger arrangement; Continuous group in first row of described empty graph case and each of second row all comprises first and second adjacent set;
AndFirst group magnetic polarity during the magnetic polarity of first group magnetic element in described first row is capable with described second is opposite;
AndDescribed generation comprises corresponding to the demodulation position signalling of the magnetic head position capable with respect to the nonmagnetic substance of fragment; To be formed summation A mutually corresponding to the readback signal sampling of described first group discrete magnetic element; To be formed summation B mutually corresponding to the readback signal sampling of described second group discrete magnetic element;
AndDifference based on A and B generates described demodulation position signalling.


20. method as claimed in claim 19 is characterized in that, described difference based on A and B generates the demodulation position signalling and comprises based on deduct B from A and generate described demodulation position signalling.
Specification(s)