SYSTEMS AND METHODS FOR REDUCING CROSSTALK BETWEEN ADJACENT WRITERS

• US 20110058271A1
• Filed: 09/09/2009
• Published: 03/10/2011
• Est. Priority Date: 09/09/2009
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Jubert, Pierre-Olivier, Herget, Philipp, Biskeborn, Robert G.
• Granted Patent: US 8,310,777 B2
• Time in Patent Office: Days
• US Class Current: 360/39
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 5/00813 magnetic tapes
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time

Abstract

In one general embodiment, a recording system controller includes a controller controlling a timing of flux switching of adjacent pairs of writers such that the writers in a given pair do not switch substantially concurrently, and reducing a current of one of the writers in the pair while the adjacent writer is writing a transition. In another general embodiment, a recording system controller includes a controller controlling a timing of pulse writing of adjacent pairs of writers such that the writers in a given pair do not pulse substantially concurrently. In yet another general embodiment, a method includes controlling a timing of pulse writing or flux switching of adjacent pairs of writers such that the writers in a given pair do not pulse or switch substantially concurrently.

Claims

1. A recording system controller, comprising:

a controller controlling a timing of flux switching of adjacent pairs of writers such that the writers in a given pair do not switch substantially concurrently, and reducing a current of one of the writers in the pair while the adjacent writer is writing a transition.

2. A recording system controller as recited in claim 1, wherein the controller controls the timing of the switching creates transitions on simultaneously-written data tracks on a magnetic medium that are out of phase with each other.

3. A recording system controller as recited in claim 1, wherein the current is reduced to about zero while the adjacent writer is writing a transition.

4. A recording system controller as recited in claim 1, wherein the current on regular intervals.

5. A recording system controller as recited in claim 1, wherein the current of the one or the writers to a point that the one of the writers is no longer writing while the adjacent writer is writing a transition.

6. A recording system controller as recited in claim 1, wherein the writers are pulsed intermittently.

7. A recording system controller as recited in claim 1, wherein the writers are formed on a common substrate.

8. A recording system controller as recited in claim 1, wherein writers in an odd position switch concurrently, wherein writers in an even position switch concurrently.

9. A recording system controller as recited in claim 1, wherein writers in first predefined positions switch concurrently, wherein writers in second predefined positions switch concurrently.

10. A recording system controller as recited in claim 9, wherein writers in third predefined positions switch concurrently.

11. A magnetic recording system, comprising:

a magnetic head comprising a plurality of writers;

a drive mechanism for passing a magnetic recording medium over the head,

a controller as recited in claim 1.

12. A recording system controller, comprising:

a controller controlling a timing of pulse writing of adjacent pairs of writers such that the writers in a given pair do not pulse substantially concurrently.

13. A recording system controller as recited in claim 12, wherein the writers pulse on regular intervals.

14. A recording system controller as recited in claim 12, wherein the writers are formed on a common substrate.

15. A recording system controller as recited in claim 12, wherein more than one pair of writers is present, wherein writers in an odd position pulse concurrently, wherein writers in an even position pulse concurrently.

16. A method, comprising:

controlling a timing of pulse writing or flux switching of adjacent pairs of writers such that the writers in a given pair do not pulse or switch substantially concurrently.

17. A method as recited in claim 16, wherein the writers in a given pair pulse or switch intermittently.

18. A method as recited in claim 16, wherein the writers pulse or switch on regular intervals.

19. A method as recited in claim 16, wherein the writers are formed on a common substrate.

20. A method as recited in claim 16, wherein more than one pair of writers is present, wherein writers in an odd position pulse or switch concurrently, wherein writers in an even position pulse or switch concurrently.