Method and apparatus for providing write current optimization

• US 6,791,780 B2
• Filed: 10/15/2001
• Issued: 09/14/2004
• Est. Priority Date: 10/15/2001
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sang, Lee, Hae Jung, Bovatsek, Ken, Cho, Keung Youn
• Primary Examiner(s): Hudspeth, David
• Assistant Examiner(s): Negron, Daniell L.
• Application Number:
  US09/978,904
• Publication Number:
  US 20030072100A1
• Time in Patent Office: 1,065 Days
• Field of Search: 360/31, 360/53, 360/66, 360/67, 360/68
• US Class Current: 360/66
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 2005/0013 of transducers, e.g. linearisation, equalisation
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/035 Equalising

Abstract

The present invention is a method and system to optimize a write channel in a hard disk drive. The method comprises providing a disk having a at least one side with a plurality of tracks, and selecting a target track from the plurality of tracks. Data is written at least once on a predetermined plurality of tracks adjacent to either side of the target track and on the target track. Data is also written a predetermined number of times on tracks immediately adjacent to the target track. Data written on the predetermined plurality of tracks adjacent to either side of the target track and on the target track is then read. The process then determines if a number of errors on the tracks is greater than a predetermined criteria, if so, a write current value of the write channel is decreased, otherwise the write current value is increased.

Claims

1. A method to optimize a write channel in a hard disk drive, comprising:

a) providing a disk having at least one side with a plurality of tracks;

b) selecting a target track from said plurality of tracks;

c) writing at least once on a predetermined plurality of tracks adjacent to either side of said target track and on said target track;

d) writing a predetermined number of times on tracks immediately adjacent to said target track;

e) reading data written on said predetermined plurality of tracks adjacent to either side of said target track and on said target track;

f) determine if a number of errors on said tracks is greater than a predetermined criteria, if so, decreasing a write current value of said write channel, otherwise increasing said write current value;

g) repeating steps c) through e); and

, determining if a number of errors on said tracks is greater than a second predetermined criteria, if so, decreasing a write current value of said write channel, and repeating steps g) and h);

otherwise decreasing said write current value, and re-optimizing said predetermined number of write channel parameters.

2. The method as recited in claim 1, further comprising optimizing a predetermined number of write channel parameters prior to acts b) through f).

3. The method as recited in claim 1, wherein in c), said predetermined plurality of tracks adjacent to said selected track includes five successive tracks adjacent to and on either side of said selected track.

4. The method as recited in claim 1, wherein in d), said predetermined number of times comprises at least 100 times.

5. The method as recited in claim 1, wherein said predetermined criteria comprises no more than one error on each track in said predetermined plurality of tracks.

6. The method as recited in claim 1, wherein in f), if said number of errors is less than or equal to predetermined criteria, then increasing said write current value, said method further comprising repeating:

c) through e), and g) determining if a number of errors on said tracks is greater than a second predetermined criteria, if not, increasing a write current value of said write channel, and repeating steps c) through e) and g);

otherwise decreasing said write current value, and re-optimizing said predetermined number of write channel parameters.

7. The method as recited in claim 1, wherein said predetermined write channel parameters comprises write channel pre-compensation values.

8. The method as recited in claim 1, further comprising storing target track number, write channel parameters and write current value in memory.

9. A system to optimize a write channel in a hard disk drive, comprising:

a housing;

a spin motor mounted to said housing;

an actuator arm mounted to said spin motor;

a disk attached to said spin motor, said disk having at least one side with a plurality of tracks;

a memory to store instruction sequences;

a processor coupled to said memory;

a read/write head mounted to said actuator arm to write on and read from said at least one side of said disk, said read/write head coupled to said processor, wherein said processor executes said instruction sequences to;

a) provide a disk having a at least one side with a plurality of tracks;

b) select a target track from said plurality of tracks;

c) write at least once on a predetermined plurality of tracks adjacent to either side of said target track and on said target track;

d) write a predetermined number of times on tracks immediately adjacent to said target track;

e) read data written on said predetermined plurality of tracks adjacent to either side of said target track and on said target track;

f) determine if a number of errors on said tracks is greater than a predetermined criteria, if so, decreasing a write current value of said write channel, otherwise increasing said write current value;

g) repeating c) through e); and

,

h) determining if a number of errors on said tracks is greater than a second predetermined criteria, if so decreasing a write current value of said write channel, and repeating steps g) and h);

otherwise decreasing said write current value, and re-optimizing said predetermined number of write channel parameters.

10. The system as recited in claim 9, wherein said instruction sequences further cause said processor to optimize a predetermined number of write channel parameters prior to acts b) through f).

11. The system as recited in claim 9, wherein in c), said predetermined plurality of tracks adjacent to said selected track includes five successive tracks adjacent to and on either side of said selected track.

12. The system as recited in claim 9, wherein in d), said predetermined number of times comprises at least 100 times.

13. The system as recited in claim 9, wherein said predetermined criteria comprises no more than one error on each track in said predetermined plurality of tracks.

14. The system as recited in claim 9, wherein in f), if said number of errors is less than or equal to predetermined criteria, then increasing said write current value, and repeating:

c) through e), and g) determining if a number of errors on said tracks is greater than a second predetermined criteria, if not, increasing a write current value of said write channel, and repeating steps c) through e) and g);

otherwise decreasing said write current value, and re-optimizing said predetermined number of write channel parameters.

15. The system as recited in claim 9, wherein said predetermined write channel parameters comprises write channel pre-compensation values.

16. The system as recited in claim 9, further comprising storing a target track number, write channel parameters and write current value in memory.

17. A method to optimize a write channel in a hard disk drive, comprising:

a) providing a disk having at least one side with a plurality of tracks;

f) selecting a target track from said plurality of tracks;

g) writing at least once on a predetermined plurality of tracks adjacent to either side of said target track and on said target track;

h) writing a predetermined number of times on tracks immediately adjacent to said target track;

i) reading data written on said predetermined plurality of tracks adjacent to either side of said target track and on said target track;

f) determine if a number of errors on said tracks is greater than a predetermined criteria, if so, decreasing a write current value of said write channel, otherwise increasing said write current value;

g) repeating steps c) through e); and

,

h) determining if a number of errors on said tracks is greater than a second predetermined criteria, if not, increasing a write current value of said write channel, and repeating g) and h);

otherwise decreasing said write current value, and re-optimizing said predetermined number of write channel parameters.

18. The method as recited in claim 17, further comprising optimizing a predetermined number of write channel parameters prior to acts b) through f).

19. The method as recited in claim 17, wherein in c), said predetermined plurality of tracks adjacent to said selected track includes five successive tracks adjacent to and on either side of said selected track.

20. The method as recited in claim 17, wherein in d), said predetermined number of times comprises at least 100 times.

21. The method as recited in claim 17, wherein said predetermined criteria comprises no more than one error on each track in said predetermined plurality of tracks.

22. The method as recited in claim 17, wherein said predetermined write channel parameters comprises write channel pre-compensation values.

23. The method as recited in claim 17, further comprising storing a target track number, write channel parameters and write current value in memory.

24. A system to optimize a write channel in a hard disk drive, comprising:

a housing;

a spin motor mounted to said housing;

an actuator arm mounted to said spin motor;

a disk attached to said spin motor, said disk having at least one side with a plurality of tracks;

a memory to store instruction sequences;

a processor coupled to said memory;

a read/write head mounted to said actuator arm to write on and read from said at least one side of said disk, said read/write head coupled to said processor, wherein said processor executes said instruction sequences to;

a) provide a disk having a at least one side with a plurality of tracks;

f) select a target track from said plurality of tracks;

g) write at least once on a predetermined plurality of tracks adjacent to either side of said target track and on said target track;

h) write a predetermined number of times on tracks immediately adjacent to said target track;

i) read data written on said predetermined plurality of tracks adjacent to either side of said target track and on said target track;

f) determine if a number of errors on said tracks is greater than a predetermined criteria, if so, decreasing a write current value of said write channel, otherwise increasing said write current value;

g) repeating c) through e); and

,

h) determining if a number of errors on said tracks is greater than a second predetermined criteria, if not, increasing a write current value of said write channel, and repeating g) and h);

otherwise decreasing said write current value, and re-optimizing said predetermined number of write channel parameters.

25. The system as recited in claim 24, wherein said instruction sequences further cause said processor to optimize a predetermined number of write channel parameters prior to acts b) through f).

26. The system as recited in claim 24, wherein in c), said predetermined plurality of tracks adjacent to said selected track includes five successive tracks adjacent to and on either side of said selected track.

27. The system as recited in claim 24, wherein in d), said predetermined number of times comprises at least 100 times.

28. The system as recited in claim 24, wherein said predetermined criteria comprises no more than one error on each track in said predetermined plurality of tracks.

29. The system as recited in claim 24, wherein said predetermined write channel parameters comprises write channel pre-compensation values.

30. The system as recited in claim 24, further comprising storing a target track number, write channel parameters and write current value in memory.