Distributed track identifier on a hard disk drive

• US 20090168227A1
• Filed: 12/31/2007
• Published: 07/02/2009
• Est. Priority Date: 12/31/2007
• Status: Abandoned Application

• Current Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Original Assignee: HGST Netherlands B.V. (Western Digital Corporation)
• Inventors: Coker, Jonathan, Blaum, Mario, Wilson, Bruce A., Yu, Mantle M.
• Application Number:
  US12/006,429
• Publication Number:
  US 20090168227A1
• Time in Patent Office: Days
• US Class Current: 360/77.50
• CPC Class Codes: G11B 5/59688 Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns

Abstract

A magnetic disk for a hard disk drive comprising a distributed track identifier is described. The disk includes a first portion of a track identifier physically located at a first location on a disk sector and a second portion of the track identifier physically located at a second location on the disk sector wherein the first portion and the second portion of the track identifier are discontinuous on the sector.

Claims

1. A magnetic disk for a hard disk drive comprising:

a first portion of a track identifier physically located at a first location on a disk sector; and

a second portion of said track identifier physically located at a second location on said disk sector wherein said first portion and said second portion of said track identifier are discontinuous on said sector.

2. The magnetic disk of claim 1 wherein said first portion and said second portion of said track identifier comprise Gray Code.

3. The magnetic disk of claim 1 wherein each of said first portion and said second portions of said track identifier separately maintain a Gray Code property.

4. The magnetic disk of claim 1 wherein said first portion and said second portion of said track identifier each comprises an odd number of ones.

5. The magnetic disk of claim 1 wherein said first portion and said second portion of said track identifier are generated from a nineteen bit input vector.

6. The magnetic disk of claim 1 wherein decoding said first and second portions of said track identifier results in a nineteen bit track identification vector.

7. The magnetic disk of claim 1 wherein said first portion and said second portion of said track identifier can be combined to determine a track identification address.

8. The magnetic disk of claim 1 wherein the track identifier is distributed in a plurality of portions, such that in each portion the least significant bits are written using a Gray code, while the most significant bits are distributed, preferably one bit per portion.

9. A disk drive system comprising:

a housing;

a motor assembly coupled with said housing, said motor assembly for rotating a magnetic disk, said magnetic disk comprising;

a first portion of a track identifier physically located at a first location on a disk sector; and

a second portion of said track identifier physically located at a second location on said disk sector wherein said first portion and said second portion of said track identifier are discontinuous on said sector

10. The disk drive of claim 9 wherein said first portion and said second portion of said track identifier comprise Gray Code.

11. The disk drive of claim 9 wherein each of said first portion and said second portions of said track identifier separately maintain a Gray Code property.

12. The disk drive of claim 9 wherein said first portion and said second portion of said track identifier each comprises an odd number of ones.

13. The disk drive of claim 9 wherein said first portion and said second portion of said track identifier are generated from a nineteen bit input vector.

14. The disk drive of claim 9 wherein decoding said first and second portions of said track identifier results in a nineteen bit track identification vector.

15. The disk drive of claim 9 wherein said first portion and said second portion of said track identifier can be combined to determine a track identification address.

16. A method for manufacturing a hard disk drive comprising:

receiving a magnetic disk;

receiving a track identifier;

splitting said track identifier into a plurality of portions;

writing a first portion of said track identifier to a first location on a disk sector; and

writing a second portion of said track identifier to a second location on said disk sector wherein said first portion and said second portion of said track identifier are discontinuous on said sector.

17. The method of claim 16 wherein said first portion and said second portion of said track identifier are written in Gray Code.

18. The method of claim 16 wherein each of said first portion and said second portions of said track identifier separately maintain a Grey Code property.

19. The method of claim 16 wherein said first portion and said second portion of said track identifier each are written with an odd number of ones.

20. The method of claim 16 wherein said track identifier is received in the form of a twenty bit vector.