Data storage device employing multiple jog profiles for a butterfly written disk surface

• US 9,099,134 B1
• Filed: 01/27/2015
• Issued: 08/04/2015
• Est. Priority Date: 01/27/2015
• Status: Active Grant

• Current Assignee: JP Morgan Chase Bank, N.A. (JP Morgan Chase & Co)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Santa Ana, Paul C., Jung, Kameron Kam-Wai, Pattanasinth, Suruk, Wong, Margaret, Huo, Xing
• Primary Examiner(s): Young, Wayne
• Assistant Examiner(s): Habermehl, James L
• Application Number:
  US14/607,040
• Time in Patent Office: 189 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G11B 5/59627 Aligning for runout, eccentricity or offset compensation G11B5/5534, G11B5/59677, G11B5/59688 take precedence

Abstract

A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of data tracks, wherein the head comprises a write element radially offset from a read element by a writer/reader offset that varies relative to a radial location of the head over the disk. A first radial band (RB) of the data tracks is written from an outer diameter (OD) of the disk toward an inner diameter (ID) of the disk, and a first jog profile is calibrated for the first radial band that compensates for the writer/reader offset. A second RB is written from an ID to an OD, and a second jog profile is calibrated for the second RB that compensates for the writer/reader offset. The first RB is accessed using the first jog profile, and the second RB is accessed using the second jog profile.

Claims

1. A data storage device comprising:

a disk comprising a plurality of data tracks;

a head actuated over the disk, the head comprising a write element radially offset from a read element by a writer/reader offset that varies relative to a radial location of the head over the disk; and

control circuitry configured to;

write to a first radial band of the data tracks from an outer diameter of the disk toward an inner diameter of the disk;

calibrate a first jog profile for the first radial band that compensates for the writer/reader offset;

write to a second radial band of the data tracks from an inner diameter of the disk toward an outer diameter of the disk;

calibrate a second jog profile for the second radial band that compensates for the writer/reader offset;

access the first radial band of data tracks using the first jog profile; and

access the second radial band of data tracks using the second jog profile.

2. The data storage device as recited in claim 1, wherein:

writing to the first radial band of the data tracks comprises shingle writing to the first radial band of the data tracks;

writing to the second radial band of the data tracks comprises shingle writing to the second radial band of the data tracks; and

the shingle writing comprising writing the data tracks in a partially overlapping manner.

3. The data storage device as recited in claim 2, wherein the first jog profile is offset from the second jog profile by a delta corresponding to a percent that the data tracks overlap.

4. The data storage device as recited in claim 1, wherein:

the first radial band of the data tracks is substantially contiguous with the second radial band of the data tracks; and

the first jog profile is offset from the second jog profile by a delta at the transition between the first radial band and the second radial band.

5. The data storage device as recited in claim 4, wherein:

writing to the first radial band of the data tracks comprises shingle writing to the first radial band of the data tracks;

writing to the second radial band of the data tracks comprises shingle writing to the second radial band of the data tracks;

the shingle writing comprising writing the data tracks in a partially overlapping manner; and

the delta corresponds to a percent that the data tracks overlap.

6. The data storage device as recited in claim 1, wherein:

writing to the first radial band comprises writing from the outer diameter of the disk toward a middle diameter of the disk; and

writing to the second radial band comprises writing from the inner diameter of the disk toward the middle diameter of the disk.

7. A method of operating a data storage device, the method comprising:

a disk comprising a plurality of data tracks;

a head actuated over the disk, the head comprising a write element radially offset from a read element by a writer/reader offset that varies relative to a radial location of the head over the disk; and

control circuitry configured to;

writing to a first radial band of data tracks from an outer diameter of a disk toward an inner diameter of the disk;

calibrating a first jog profile for the first radial band that compensates for a writer/reader offset between a write element radially offset from a read element of a head;

writing to a second radial band of the data tracks from an inner diameter of the disk toward an outer diameter of the disk;

calibrating a second jog profile for the second radial band that compensates for the writer/reader offset;

accessing the first radial band of data tracks using the first jog profile; and

accessing the second radial band of data tracks using the second jog profile.

8. The method as recited in claim 7, wherein:

writing to the first radial band of the data tracks comprises shingle writing to the first radial band of the data tracks;

writing to the second radial band of the data tracks comprises shingle writing to the second radial band of the data tracks; and

the shingle writing comprising writing the data tracks in a partially overlapping manner.

9. The method as recited in claim 8, wherein the first jog profile is offset from the second jog profile by a delta corresponding to a percent that the data tracks overlap.

10. The method as recited in claim 7, wherein:

the first radial band of the data tracks is substantially contiguous with the second radial band of the data tracks; and

the first jog profile is offset from the second jog profile by a delta at the transition between the first radial band and the second radial band.

11. The method as recited in claim 10, wherein:

writing to the first radial band of the data tracks comprises shingle writing to the first radial band of the data tracks;

writing to the second radial band of the data tracks comprises shingle writing to the second radial band of the data tracks;

the shingle writing comprising writing the data tracks in a partially overlapping manner; and

the delta corresponds to a percent that the data tracks overlap.

12. The method as recited in claim 7, wherein:

writing to the first radial band comprises writing from the outer diameter of the disk toward a middle diameter of the disk; and

writing to the second radial band comprises writing from the inner diameter of the disk toward the middle diameter of the disk.