Method and apparatus for providing positional information on a disk

Abstract

The present invention is a method and apparatus for providing positional information of a disk. The disk has at least one side with a plurality of tracks, each having a first burst in a first servo field and a second burst in a second servo field. The first burst provides a first portion of track position information while the second burst provides a second portion of track position information. When combined, the first and second portions provide a position of a corresponding track. Each track further includes a third and a fourth burst that provides a first portion and a second portion of disk side position information. When combined, the first and second portions of disk side position information provide the disk side position of the disk. Each track also includes a burst that provides the quadrant position of the disk. In one embodiment, the first and second bursts are located on consecutive sectors, and each track includes a servo sector sequence burst with a sector sequence number that identifies the sequence position of the consecutive sectors. The first portion, the second portion and their corresponding sector sequence number in combination provide a position of a corresponding track.

1. A disk for a hard disk drive, comprising:
 a disk including at least one side having a plurality of tracks, each track including a group having first and second sectors, each of the first and second sectors within said group includes first and second servo fields, the first servo field in each of the first and second sectors providing a portion of higher order bits of a track position information, the second servo field in each of the first and second sectors providing lower order bits of the track position information, the first servo fields of the first and second sectors and the second servo field in one of the first and second sectors, in combination, providing the track position information.  
 
     
     
       2. The disk as recited in  claim 1 , wherein the group includes a third sector having first and second servo fields, the first servo field in the third sector providing a portion of higher order bits of the track position information, and the second servo field in the third sector providing lower order bits of the track position information, the first servo fields of the first, second, and third sectors and the second servo field in one of the first, second, and third sectors, in combination, providing the track position information. 
     
     
       3. The disk as recited in  claim 2 , wherein the group includes a fourth sector having a first servo field, the first servo field in the fourth sector of the group providing a disk side position of the disk. 
     
     
       4. The disk as recited in  claim 3 , wherein the group includes a fifth sector having a first servo field, the first servo field in the fourth and fifth sectors, in combination, providing the disk side position of the disk. 
     
     
       5. The disk as recited in  claim 4 , wherein the group includes a sixth sector having a first servo field, the first servo field in the sixth sector providing a quadrant of the disk. 
     
     
       6. The disk as recited in  claim 5 , wherein each track includes a plurality of groups each having six sectors, wherein complete disk positional information is obtained by reading one of the plurality of groups of six sectors. 
     
     
       7. The disk as recited in  claim 1 , wherein the first servo field of the first and second sectors each includes a sector sequence number field and a servo multiplex data field, a sequence number in the sector sequence number field identifies a value in the corresponding servo multiplex data field as the portion of the track position information. 
     
     
       8. The disk as recited in  claim 5 , wherein the first servo field in each of the first through six sectors of the group includes a sector sequence number field and a servo multiplex data field, a sequence number in the sector sequence number field identifies a value in the corresponding servo multiplex data field. 
     
     
       9. The disk as recited in  claim 8  wherein when the sequence number is at a first number, the value in the corresponding servo multiplex data field represents the portion of the higher order bits of the track position information, where when the sequence number is at a second number, the value in the corresponding servo multiplex data field represents a portion of the disk side portion of the disk, and wherein when the sequence number is at a third number, the value in the corresponding servo multiplex data field represents the quadrant of the disk. 
     
     
       10. 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, each track including a group having first and second sectors, each of the first and second sectors within said group includes first and second servo fields, the first servo field in each of the first and second sectors providing a portion of higher order bits of a track position information, the second servo field in each of the first and second sectors providing lower order bits of the track position information, the first servo fields of the first and second sectors and the second servo field in one of the first and second sectors, in combination, providing the track position information; and  
 a read/write head mounted to said actuator arm for reading said at least one side of said disk.  
 
     
     
       11. The hard disk drive as recited in  claim 10 , wherein the group includes a third sector having first and second servo fields, the first servo field in the third sector providing a portion of higher order bits of the track position information, and the second servo field in the third sector providing lower order bits of the track position information, the first servo fields of the first, second, and third sectors and the second servo field in one of the first, second, and third sectors, in combination, providing the track position information. 
     
     
       12. The hard disk drive as recited in  claim 11 , wherein the group includes a fourth sector having a first servo field, the first servo field in the fourth sector of the group providing a disk side position of the disk. 
     
     
       13. The hard disk drive as recited in  claim 12 , wherein the group includes a fifth sector having a first servo field, the first servo field in the fourth and fifth sectors, in combination, providing the disk side position of the disk. 
     
     
       14. The hard disk drive as recited in  claim 13 , wherein the group includes a sixth sector having a first servo field, the first servo field in the sixth sector providing a quadrant of the disk. 
     
     
       15. The hard disk drive as recited in  claim 14 , wherein the first servo field in each of the first through six sectors of the group includes a sector sequence number field and a servo multiplex data field, a sequence number in the sector sequence number field identifies a value in the corresponding servo multiplex data field. 
     
     
       16. The hard disk drive as recited in  claim 15  wherein when the sequence number is at a first number, the value in the corresponding servo multiplex data field represents the portion of the higher order bits of the track position information, where when the sequence number is at a second number, the value in the corresponding servo multiplex data field represents a portion of the disk side position of the disk, and wherein when the sequence number is at a third number, the value in the corresponding servo multiplex data field represents the quadrant of the disk. 
     
     
       17. A method for providing servo information on a disk in a hard disk drive, comprising:
 a) providing a disk having at least one side with a plurality of tracks, each track including a group having first and second sectors, each of the first and second sectors within said group includes first and second servo fields, the first servo field in each of the first and second sectors providing a portion of higher order bits of a track position information, the second servo field in each of the first and second sectors providing lower order bits of the track position information;  
 b) reading the first servo fields of the first and second sectors and the second servo field in one of the first and second sectors; and  
 c) determining track position information of the disk in response to reading the first servo fields of the first and second sectors and the second servo field in one of the first and second sectors.  
 
     
     
       18. The method as recited in  claim 17 , wherein the group includes a third sector having a first servo field providing a disk side position of the disk, and wherein reading comprises reading the first servo fields of the first through third sectors and the second servo field in one of the first and second sectors, and wherein determining comprises determining track position information and disk side position of the disk. 
     
     
       19. The method as recited in  claim 18  wherein the group includes a fourth sector having a first servo field providing a quadrant of the disk, and wherein reading comprises reading the first servo fields of the first through fourth sectors and the second servo field in one of the first and second sectors, and wherein determining comprises determining track position information, disk side position, and quadrant of the disk. 
     
     
       20. The method as recited in clam  17 , wherein each track includes a plurality of groups. 
     
     
       21. A data storage medium having N number of tracks, comprising:
   a plurality of sectors, at least one of said plurality of sectors including a first track identification information for identifying a corresponding particular track to which said at least one of said plurality of sectors belong, said first track identification information consisting of M number of bits, said M being an integer less than log   2   N.     
     
     
       22. The data storage medium according to  claim 21 , wherein:
   at least a portion of said first track identification information is encoded in graycode encoding.     
     
     
       23. The data storage medium according to  claim 21 , further comprising:
   one or more consecutive sectors adjacent to said at least one of said plurality of sectors, said one or more consecutive sectors each including a remainder track identification information, said first track identification information and said remainder track information from each of said one or more consecutive sectors being combined together to identify said corresponding particular track to which said at least one of said plurality of sectors belong.     
     
     
       24. A data storage device, comprising:
   a data storage medium having N number of tracks and a plurality of sectors, at least one of said plurality of sectors including a first track identification information for identifying a corresponding particular track to which said at least one of said plurality of sectors belong, said first track identification information consisting of M number of bits, said M being less than log   2   N.     
     
     
       25. The data storage device according to  claim 24 , wherein:
   at least a portion of said first track identification information is encoded in graycode encoding.     
     
     
       26. The data storage device according to  claim 24 , wherein:
   said data storage medium further comprises one or more consecutive sectors adjacent to said at least one of said plurality of sectors, said one or more consecutive sectors each including a remainder track identification information, said first track identification information and said remainder track information from said one or more consecutive sectors being combined together to identify said corresponding particular track to which said at least one of said plurality of sectors belong.     
     
     
       27. A method of recording track information on a data storage medium having N number of tracks, each including a plurality of sectors, comprising:
   recording in at least one of said plurality of sectors a first track identification information for identifying a corresponding particular track to which said at least one of said plurality of sectors belong, said first track identification information consisting of M number of bits, said M being less than log   2   N.     
     
     
       28. The method of recording track information in accordance with  claim 27 , wherein:
   at least a portion of said first track identification information is encoded in graycode encoding.     
     
     
       29. The method of recording track information in accordance with  claim 27 , further comprising:
   recording in one or more consecutive sectors adjacent to said at least one of said plurality of sectors a remainder track identification information, said first track identification information and said remainder track information from each of said one or more consecutive sectors being combined together to identify said corresponding particular track to which said at least one of said plurality of sectors belong.     
     
     
       30. A data storage device, comprising:
   one or more data storage media collectively having N number of tracks and a plurality of sectors, at least one of said plurality of sectors including a first track identification information for identifying a corresponding particular track to which said at least one of said plurality of sectors belong, said first track identification information consisting of M number of bits, said M being less than log   2   N.     
     
     
       31. The data storage device according to  claim 30 , wherein:
   at least a portion of said first track identification information is encoded in graycode encoding.     
     
     
       32. The data storage device according to  claim 30 , wherein:
   said one or more data storage media further comprises one or more consecutive sectors adjacent to said at least one of said plurality of sectors, said one or more consecutive sectors each including a remainder track identification information, said first track identification information and said remainder track information from said one or more consecutive sectors being combined together to identify said corresponding particular track to which said at least one of said plurality of sectors belong.     
     
     
       33. A method of recording track information in a data storage device having one or more data storage media collectively having N number of tracks and a plurality of sectors, comprising:
   recording in at least one of said plurality of sectors a first track identification information for identifying a corresponding particular track to which said at least one of said plurality of sectors belong, said first track identification information consisting of M number of bits, said M being less than log   2   N.     
     
     
       34. The method of recording track information in accordance with  claim 33 , wherein:
   at least a portion of said first track identification information is encoded in graycode encoding.     
     
     
       35. The method of recording track information in accordance with  claim 33 , further comprising:
   recording in one or more consecutive sectors adjacent to said at least one of said plurality of sectors a remainder track identification information, said first track identification information and said remainder track information from each of said one or more consecutive sectors being combined together to identify said corresponding particular track to which said at least one of said plurality of sectors belong.     
     
     
       36. A data storage medium having a plurality of tracks, comprising:
   a first sector including a first track identification field, said first identification field consisting of a number of bits, which is less than a total number of bits required to individually address all of said plurality of tracks on said data storage medium; and        one or more consecutive sectors adjacent to said first sectors, said first sector and said one or more consecutive sectors being on an identical one of said plurality of tracks;        wherein said one or more consecutive sectors each includes a remainder track identification field, said first identification field and said remainder track identification field from said one or more consecutive sectors combined together completely identify said identical one of said plurality of tracks.     
     
     
       37. The data storage medium according to  claim 36 , wherein:
   at least a portion of said first track identification field and said remainder track identification field is encoded in graycode encoding.     
     
     
       38. A data storage device, comprising:
   a data storage medium including a plurality of tracks, said data storage medium having a first sector including a first track identification field, said first identification field consisting of a number of bits, which is less than a total number of bits required to individually address all of said plurality of tracks on said data storage medium, said data storage medium further including one or more consecutive sectors adjacent to said first sector, said first sector and said one or more consecutive sectors being on an identical one of said plurality of tracks, said one or more consecutive sectors each including a remainder track identification field, wherein said first identification field and said remainder track identification field from said one or more consecutive sectors combined together completely identify said identical one of said plurality of tracks.     
     
     
       39. The data storage device according to  claim 38 , wherein:
   at least a portion of said first track identification field and said remainder track identification field is encoded in graycode encoding.     
     
     
       40. A data storage device, comprising:
   one or more data storage media collectively including a plurality of tracks, said data storage media having a first sector including a first track identification field, said first identification field consisting of a number of bits, which is less than a total number of bits required to individually address all of said plurality of tracks on said one or more data storage media, said one or more data storage media further including one or more consecutive sectors adjacent to said first sector, said first sector and said one or more consecutive sectors being on an identical one of said plurality of tracks, said one or more consecutive sectors each including a remainder track identification field, said first identification field and said remainder track identification field from said one or more consecutive sectors combined together completely identify said identical one of said plurality of tracks.     
     
     
       41. The data storage device according to  claim 40 , wherein:
   at least a portion of said first track identification field and said remainder track identification field is encoded in graycode encoding.     
     
     
       42. A method of recording track number information in a data storage device employing a data storage medium having a plurality of tracks, comprising:
   writing in a first sector of said data storage medium a first track identification, said first identification consisting of a number of bits, which is less than a total number of bits required to individually address all of said plurality of tracks on said data storage medium; and        writing in each of one or more consecutive sectors adjacent to said first sector a remainder track identification, said first sector and said one or more consecutive sectors being on an identical one of said plurality of tracks, said first identification and said remainder track identification from said one or more consecutive sectors combined together completely identify said identical one of said plurality of tracks.     
     
     
       43. The method of recording track number information in accordance with  claim 42 , wherein said writing of said first identification and said remainder track identification further comprises:
   encoding at least a portion of said first track identification and said remainder track identification in graycode encoding.     
     
     
       44. A method of recording track number information in a data storage device employing one or more data storage media collectively having a plurality of tracks, comprising:
   writing in a first sector of said one or more data storage media a first track identification; said first track identification consisting of a number of bits, which is less than a total number of bits required to    individually address all of said plurality of tracks on said one or more data storage media; and        writing in each of one or more consecutive sectors adjacent to said first sector a remainder track identification, said first sector and said one or more consecutive sectors being on an identical one of said plurality of tracks, said first track identification and said remainder track identification from said one or more consecutive sectors combined together completely identify said identical one of said plurality of tracks.     
     
     
       45. The method of recording track number information in accordance with  claim 44 , wherein said writing of said first identification and said remainder track identification further comprises:
   encoding at least a portion of said first track identification and said remainder track identification in graycode encoding.