Variable written track widths for attribute-based storage

• US 10,090,016 B2
• Filed: 08/03/2017
• Issued: 10/02/2018
• Est. Priority Date: 11/24/2014
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Gao, Kaizhong, Zhu, Wenzhong, Rausch, Tim, Gage, Edward
• Primary Examiner(s): Butcher, Brian
• Application Number:
  US15/667,904
• Publication Number:
  US 20170330587A1
• Time in Patent Office: 425 Days
• Field of Search: None
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1258 where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
• CPC Class Codes: G11B 2005/0021 Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
• CPC Class Codes: G11B 2020/1087 wherein a selection is made among at least two alternative ways of processing
• CPC Class Codes: G11B 2020/10888 the kind of data being the selection criterion
• 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 2020/1264 wherein the formatting concerns a specific kind of data
• CPC Class Codes: G11B 2020/1292 Enhancement of the total storage capacity
• 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 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
• CPC Class Codes: G11B 5/4866 the arm comprising an optical waveguide, e.g. for thermally-assisted recording
• CPC Class Codes: G11B 5/6088 Optical waveguide in or on flying head
• CPC Class Codes: G11B 7/0037 with discs

Abstract

A storage device controller is configured to select one of multiple written track widths for a storage location based on a write attribute of data to be recorded at the storage location. According to one implementation, the storage device controller is further configured to select a power level for a heat-assisted magnetic recording (HAMR) device based on the write attribute.

Claims

1. One or more computer-readable storage media of a tangible article of manufacture encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising:

selectively writing incoming data to a series of tracks consisting of a first series of alternating data tracks in a first radial zone of a storage medium responsive to a determination that the incoming data is cache data, the first series of alternating data tracks excluding a second series of alternating data tracks interlaced with the first series.

2. The one or more computer-readable storage media of claim 1, wherein the computer process further comprises:

writing the incoming data to the first series of alternating data tracks in the first radial zone at first written track width responsive to a determination that the incoming data is cache data; and

writing the incoming data to a second radial zone of the storage medium at a second track width different from the first written track width responsive to a determination that the incoming data is non-cache data.

3. The one or more computer-readable storage media of claim 2, wherein the first written track width is larger than the second track width.

4. The one or more computer-readable storage media of claim 2, wherein the computer process further comprises:

writing the incoming data with a first write head having a first write pole width responsive to a determination that the incoming data is cache data; and

writing the incoming data with a second write head having a second write pole width responsive to a determination that the incoming data is non-cache data, the first write pole width larger than the second write pole width.

5. The one or more computer-readable storage media of claim 2, wherein the computer process further comprises:

writing the incoming data at a first linear density responsive to a determination that the incoming data is cache data; and

writing the incoming data at a second linear density a responsive to a determination that the incoming data is non-cache data, the first linear density higher than the second linear density.

6. The one or more computer-readable storage media of claim 1, wherein the computer process further comprises selecting a higher power level for operating a HAMR head when the incoming data is cache data than when the incoming data is non-cache data.

7. One or more computer-readable storage media of a tangible article of manufacture encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising:

writing data to a first set of alternating data tracks on a storage medium with a first write head having a first write pole width responsive to a determination that at least one of a write frequency and write recency of the data is higher than a first predefined threshold; and

writing data to a second set of alternating data tracks with a second write head having a second write pole width responsive to a determination that the at least one of write frequency and write recency is lower than a second predefined threshold, wherein the first set of alternating data tracks is interlaced with the second set of alternating data tracks, the first write pole width being smaller than the second write pole width.

8. The one or more computer-readable storage media of claim 7, wherein the first set of alternating data tracks are randomly writable data tracks and the second set of alternating data tracks are not randomly writable data tracks.

9. The one or more computer-readable storage media of claim 7, wherein the first set of alternating data tracks consists of top data tracks in an interlaced magnetic recording scheme and the second set of alternating data tracks consists of bottom data tracks in an interlaced magnetic recording scheme.

10. The one or more computer-readable storage media of claim 7, wherein writing the data to the first set of alternating data tracks further comprises writing the data at a first linear density and wherein writing the data to the second set of alternating data tracks further comprises writing the data a second linear density higher than the first linear density.

11. The one or more computer-readable storage media of claim 7, wherein writing the data to the first set of alternating data tracks further comprises writing the data to a determination that the write frequency of the data is higher than the first predefined threshold.

12. The one or more computer-readable storage media of claim 7, wherein writing the data to the second set of alternating data tracks further comprises writing the data responsive to a determination that the write frequency of the data is lower than the second predefined threshold.

13. An apparatus comprising:

a storage device controller configured to;

write incoming data to a first radial zone of a storage medium at a first written track width responsive to a determination that the incoming data is cache data; and

write the incoming data to a second radial zone of the storage medium at one or more written track widths different from the first written track width responsive to a determination that the incoming data is non-cache data, the first written track width and the second written track width each defining an area on the storage medium that is initially magnetized as the area rotates through a magnetic field generated by a write element.

14. The apparatus of claim 13, wherein the first written track width is wider than at least one other written track width of a data track storing non-cache data.

15. The apparatus of claim 13, wherein the storage device controller is further configured to:

control a first write head to write the incoming data responsive to the determination that the incoming data is cache data; and

control a second write head to write the incoming data responsive to the determination that the incoming data is non-cache data, the first write head having a write pole with a larger width than a write pole of the second write head.

16. The apparatus of claim 15, wherein the storage device controller is further configured to:

control the first write head to write the incoming data at a first linear density responsive to the determination that the incoming data is cache data; and

control the second write head to write the incoming data at a second linear density responsive to the determination that the incoming data is non-cache data, the first linear density higher than the second linear density.

17. The apparatus of claim 13, wherein the storage device controller selects a higher power level for operating a HAMR head heat source when the incoming data is cache data than when the incoming data is non-cache data.

18. The apparatus of claim 13, wherein the storage device is further configured to:

write the incoming data exclusively to alternating data tracks within the first radial zone responsive to a determination that the incoming data is cache data.