Variable written track widths for attribute-based storage

Patent metadata

Field	Value
Publication number	US-2016148643-A1
Application number	US-201514688598-A
Country	US
Kind code	A1
Filing date	Apr 16, 2015
Priority date	Nov 24, 2014
Publication date	May 26, 2016
Grant date	—

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.

First claim

What is claimed is:

1 . One or more computer-readable storage media 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 write attribute of data to be recorded at the storage location.

2 . The one or more computer-readable storage media of claim 1 , wherein the computer process further comprises:
selecting a power level for operating a heat-assisted magnetic recording (HAMR) head to write the data to the storage location based on the write attribute.

3 . The one or more computer-readable storage media of claim 1 , wherein the write attribute is at least one of write frequency or write recency.

4 . The one or more computer-readable storage media of claim 2 , wherein selecting the power level for operating the HAMR head further comprises:
selecting a higher power if the data is cache data than if the data is non-cache data.

5 . The one or more computer-readable storage media of claim 2 , wherein selecting the power level for operating HAMR head further comprises:
selecting between at least two power levels associated with separate regions of a magnetic medium.

6 . The one or more computer-readable storage media of claim 1 , wherein the storage location is 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.

7 . 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.

8 . 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.

9 . One or more computer-readable storage media 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.

10 . The one or more computer-readable storage media of claim 9 , wherein the attribute is at least one of a data type or a size of the data.

11 . The one or more computer-readable storage media of claim 9 , 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.

12 . The one or more computer-readable storage media of claim 9 , wherein selecting the power level further comprises:
selecting a higher power if the data is cache data than if the data is non-cache data.

13 . The one or more computer-readable storage media of claim 9 , 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.

14 . The one or more computer-readable storage media of claim 9 , further comprising:
writing the data to a low density data track included between high-density data bands if the data is system data.

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

16 . Apparatus comprising:
a storage device controller configured to 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 of the storage medium at one or more written track widths different from the first track width.

17 . The apparatus of claim 16 , wherein the first written track width of the cache data is larger than the one or more written tracks of the non-cache data.

18 . The apparatus of claim 16 , wherein the storage device controller is further configured to select a power level for operating a heat-assisted magnetic recording (HAMR) head to write the data to the storage location based whether incoming data is cache data or non-cache data.

19 . The apparatus of claim 18 , wherein the storage device controller selects a higher power level for operating the HAMR head when the data is cache data than when the data is non-cache data.

20 . The apparatus of claim 16 , wherein cache data is written exclusively to alternating data tracks within the first radial zone.

21 . One or more computer-readable storage media encoding computer-executable instructions for executing on a computer system a computer process, the computer process comprising:
a storage device controller configured to select one of multiple written track widths for a storage location based on a current available storage capacity on a storage medium.

Assignees

• Seagate Technology Llc

Inventors

• Gao Kaizhong
• Zhu Wenzhong
• Rausch Tim
• Gage Edward

Classifications

• G11B2020/10888

  the kind of data being the selection criterion · CPC title

• G11B20/1258

  where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs · CPC title

• G11B7/0037

  with discs · CPC title

• G11B5/4866

  the arm comprising an optical waveguide, e.g. for thermally-assisted recording · CPC title

• G11B20/1217 Primary

  on discs · CPC title