Granted Patent B1

US 7,046,465 · App. 10/927,900 · Granted May 16, 2006

Abstract

Claims (25)

1. A disk drive, comprising:

a spindle motor;

a disk mounted for rotation on the spindle motor, the disk including a recording surface having a track that includes a first full servo wedge and a second full servo wedge, each of the first full and second full servo wedges defining a leading end and a trailing end and having, between leading and trailing ends, a preamble, a servo sync word, a track ID, and a plurality of servo positioning burst fields, the recording surface further including user addressable data locations and a first partial servo wedge disposed between the trailing end of the first full servo wedge and the leading end of the second full servo wedge, the first partial servo wedge being devoid of preamble, track ID and wedge ID and including a short servo sync mark that is different from the servo sync word, the servo sync mark defining a predetermined bit pattern that is immediately followed by a plurality of servo bursts, and

a head for reading from and writing to the disk.

2. The disk drive of claim 1 , further including at least one second partial servo wedge between the first partial servo wedge and the second full servo wedge.

3. The disk drive of claim 1 , wherein the servo sync mark is shorter in length than the servo sync word.

4. The disk drive of claim 1 , wherein the servo sync mark includes a predetermined bit pattern.

5. The disk drive of claim 4 , wherein the predetermined bit pattern is 8 bits in length.

6. The disk drive of claim 4 , wherein the predetermined bit pattern includes a portion in which no logical transitions occur.

7. A disk for a magnetic disk drive, the disk including a recording surface having a track that includes a first full servo wedge and a second full servo wedge, each of the first full and second full servo wedges defining a leading end and a trailing end and having, between leading and trailing ends, a preamble, a servo sync word, a track ID, and a plurality of servo positioning burst fields, the recording surface further including user addressable data locations and a first partial servo wedge disposed between the trailing end of the first full servo wedge and the leading end of the second full servo wedge, the first partial servo wedge being devoid of preamble, track ID and wedge ID and including a short servo sync mark that is different from the servo sync word, the servo sync mark defining a predetermined bit pattern that is immediately followed by a plurality of servo bursts.

8. The disk of claim 7 , further including at least one second partial servo wedge between the first partial servo wedge and the second full servo wedge.

9. The disk of claim 7 , wherein the servo sync mark is shorter in length than the servo sync word.

10. The disk of claim 7 , wherein the servo sync mark includes a predetermined bit pattern.

11. The disk of claim 10 , wherein the predetermined bit pattern is 8 bits in length.

12. The disk of claim 10 , wherein the predetermined bit pattern includes a portion in which no logical transitions occur.

13. A method of reading a magnetic disk of a disk drive, the method comprising the sequential steps of:

reading a first full servo wedge disposed along a first track, the first full servo wedge defining a leading end and a trailing end and having, between leading and trailing ends, a preamble, a servo sync word, a track ID, and a plurality of servo positioning burst fields;

reading first user data from first user addressable data locations disposed along the track after the first full servo wedge;

reading a first partial servo wedge disposed along the first track after the first user addressable locations, the first partial servo wedge being devoid of preamble, track ID and wedge ID and including a short servo sync mark that is different from the servo sync word, the servo sync mark defining a predetermined bit pattern that is immediately followed by a plurality of servo bursts;

reading second user data from second user addressable data locations disposed along the track after the first partial servo wedge, and

reading a second full servo wedge disposed along a first track after the second user addressable data locations, the second full servo wedge defining a leading end and a trailing end and having, between leading and trailing ends, a preamble, a servo sync word, a track ID, and a plurality of servo positioning burst fields.

14. The method of claim 13 , wherein the servo sync mark read in the first full servo wedge reading step is shorter in length than the servo sync word read in the first partial servo wedge reading step.

15. The method of claim 13 , wherein the servo sync mark in the first partial servo wedge reading step includes a predetermined bit pattern.

16. The disk of claim 15 , wherein the predetermined bit pattern in the first partial servo wedge reading step is 8 bits in length.

17. The disk of claim 10 , wherein the predetermined bit pattern in the first partial servo wedge reading step includes a portion in which no logical transitions occur.

Assignments (8)