Variable written track widths for attribute-based storage

• US 9,747,942 B2
• Filed: 04/16/2015
• Issued: 08/29/2017
• 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 M
• Application Number:
  US14/688,598
• Publication Number:
  US 20160148643A1
• Time in Patent Office: 866 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:

selecting one of multiple written track widths within a data band for a storage location based on a data type of data to be recorded at the storage location;

selecting a wider written track width for the storage location responsive to a determination that the data type is cache data than a written track width selected responsive to a determination that the data type is non-cache data; and

selecting a power level for operating a heat-assisted magnetic recording (HAMR) head to write the data based on the data type.

2. The one or more computer-readable storage media of claim 1, wherein selecting the power level for operating the HAMR head further comprises:

selecting between at least two power levels associated with separate regions of a magnetic medium.

3. The one or more computer-readable storage media of claim 1, wherein the selected data track is within a cache region on a storage medium, the cache region including data tracks storing data at a written track width that is greater than a written track width of other data tracks on the storage medium that are not included in the cache region.

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

if the data is hot data, writing the data to top data tracks included in an interlaced magnetic recording scheme; and

if the data is cold data, writing the data to bottom data tracks included in the interlaced magnetic recording scheme.

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

writing the data to a low density data track included between high-density data bands if the data is system data.

6. 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:

selecting a power level for operating a heat-assisted magnetic recording (HAMR) head to record data on a storage medium based on an attribute of the data; and

writing the data to the storage medium while operating the HAMR head exclusively at the selected power level,

wherein the data is written to top data tracks included in an interlaced magnetic recording scheme responsive to a determination that at least one of a write frequency and write recency is higher than a predefined threshold; and

wherein the data is written to bottom data tracks included in the interlaced recording scheme responsive to a determination that at least one of write frequency and write recency is lower than a predefined threshold.

7. The one or more computer-readable storage media of claim 6, wherein the attribute is at least one of a data type or a size of the data.

8. The one or more computer-readable storage media of claim 6, wherein the computer process further comprises:

writing the data to a cache region on a storage medium, the cache region including data tracks storing data at a written track width that is greater than a written track width of other data tracks on the storage medium that are not included in the cache region.

9. The one or more computer-readable storage media of claim 6, wherein the storage medium includes data tracks with a track pitch that is different in different radial zones of the storage medium, and the computer process further comprises selecting a radial zone for storing the data based on the attribute.

10. An apparatus comprising:

a storage device controller configured to;

select a power level for operating a heat-assisted magnetic recording (HAMR) head to write incoming data to a selected data track based whether the incoming data is cache data or non-cache data; and

write cache data to a first radial zone of a storage medium at a first written track width and non-cache data to a second radial zone of the storage medium at one or more written track widths different from the first written track width.

11. The apparatus of claim 10, wherein the first written track width of the cache data is larger than the one or more written tracks of the non-cache data.

12. The apparatus of claim 10, wherein the storage device controller selects a higher power level for operating the HAMR head when the incoming data is cache data than when the incoming data is non-cache data.

13. The apparatus of claim 10, wherein cache data is written exclusively to alternating data tracks within the first radial zone.

14. 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:

selecting a written track width of multiple written track widths for a storage location based on a current available storage capacity on a storage medium; and

writing data to a low density data track included between high-density data bands responsive to a determination that the data is system data.