Magnetic storage device readers

• US 9,818,445 B2
• Filed: 01/12/2016
• Issued: 11/14/2017
• Est. Priority Date: 01/12/2016
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Zhu, Wenzhong, Erden, Mehmet F., Haapala, Kenneth A., Tian, Wei, Gage, Edward
• Primary Examiner(s): Wong, K.
• Application Number:
  US14/993,694
• Publication Number:
  US 20170200468A1
• Time in Patent Office: 672 Days
• Field of Search: None
• CPC Class Codes: G11B 20/10009 Improvement or modification of read or write signals
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 2020/1238 track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located
• 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 5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/4813 Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm G11B5/484 takes precedence
• CPC Class Codes: G11B 5/4886 relative to rotating disc

Abstract

Implementations described and claimed herein includes a storage device comprising a plurality of readers, including a first subset of readers configured to read a first subset of tracks and a second subset of readers configured to read a second subset of tracks, the first subset of tracks being wider than the second subset of tracks. In another implementation, the readers in the first subset of readers are wider than the readers in the second subset of readers. The wider readers may be configured to recover servo information and the narrow readers may be configured to recover data information. The storage devices may include two-dimensional magnetic recording, conventional perpendicular magnetic recording, shingled magnetic recording, multi-sensor magnetic recording, and interlaced magnetic recording.

Claims

1. A storage device comprising:

a plurality of readers, including a first subset of readers to read a first subset of tracks and a second subset of readers to read a second subset of tracks, the first subset of tracks being wider than the second subset of tracks and the first subset of readers being wider than the readers in the second subset of readers.

2. The storage device of claim 1, wherein the readers in the first subset of readers are configured to recover servo information in the first subset of tracks.

3. The storage device of claim 1, wherein the readers in the first subset of readers are configured to recover data information in the first subset of tracks.

4. The storage device of claim 1, wherein the readers in the second subset of readers are configured to recover data information in the readers in the second subset of tracks.

5. The storage device of claim 1, wherein the readers in the first subset of readers are co-planar in a cross-track direction to the readers in the second subset of readers.

6. The storage device of claim 1, wherein the readers in the second subset of readers are configured to be 65-105% of a track width of the second subset of tracks.

7. The storage device of claim 1, wherein widths of the readers in the first subset of readers are configured to be 1.5-2 times a width of the second subset of readers.

8. A system comprising:

a transducer head, including two or more readers co-planar in a cross-track direction and configured to read data tracks and servo tracks of different width, the two or more readers including a first reader being wider than a second reader in the cross-track direction.

9. The system of claim 8, wherein a width of the first reader is configured to be 1.5-2 times a width of the second reader.

10. The system of claim 8, wherein the first reader is configured to recover servo information.

11. The system of claim 8, wherein the first reader is configured to recover data information.

12. The system of claim 8, wherein the second reader is configured to recover data information.

13. The system of claim 8, wherein the system is one of a two-dimensional magnetic recording system, a conventional perpendicular magnetic recording system, a shingled magnetic recording system, a multi-sensor magnetic recording system, and an interlaced magnetic recording system.

14. A storage device comprising:

an interlaced magnetic recording system; and

a transducer head with two readers co-planar in a cross-track direction, including a first reader being wider than a second reader in the cross-track direction.

15. The storage device of claim 14, wherein a width of the first reader is approximately 1.5-2 times a width of the second reader.

16. The storage device of claim 14, wherein the first reader is configured to read a single-side trimmed bottom data field.

17. The storage device of claim 14, wherein the first reader is configured to read an untrimmed bottom track data field and a servo data field.

18. The storage device of claim 14, wherein the second reader is configured to read a top track data field and a single-sided trimmed bottom data field.

19. The storage device of claim 14, wherein the second reader is configured to read a top track data field and a double-sided trimmed bottom data field.

20. The storage device of claim 14, the storage device is a hard disk drive.