Heat-assisted shingled magnetic recording with variable track widths

Patent metadata

Field	Value
Publication number	US-2018047422-A1
Application number	US-201715795044-A
Country	US
Kind code	A1
Filing date	Oct 26, 2017
Priority date	May 13, 2016
Publication date	Feb 15, 2018
Grant date	—

Abstract

A storage device includes a storage controller configured to operate a heat-assisted magnetic recording head to write data to a band of consecutive data tracks in a consecutive track order while selectively alternating a power level of the heat source when writing to some data tracks of the band.

First claim

What is claimed is:

1 . A system comprising:
a storage medium including a data band of consecutive data tracks, the data band including first series of alternating data tracks and a second series of alternating data tracks interlaced with the first series, each data track of the first series overlapping a previously-written track by a first offset and each data track of the second series overlapping a previously-written track by a second offset different than the first offset; and a storage device controller configured to write data to the data band in a consecutive track order.

2 . The system of claim 1 , wherein the first offset is a non-zero offset and the second offset is a zero offset.

3 . The system of claim 1 , wherein the data tracks of the first series have a different written track width than the data tracks of the second series.

4 . The system of claim 1 , wherein the storage device controller is configured to operate a heat source of a heat-assisted magnetic recording (HAMR) head at a first level when writing the data to the first series of alternating data tracks and configured to operate the heat source at a second different level when writing to the second series of alternating data tracks.

5 . The system of claim 1 , wherein the storage device controller is further configured to write data of a first linear density to the first series of alternating tracks in the data band and to write data of a second linear density to the second series of alternating data tracks in the data band.

6 . The system of claim 1 , wherein data tracks of the data band are arranged according to a uniform track pitch.

7 . The system of claim 1 , wherein the data band of consecutive data tracks is a shingled data band in a shingled magnetic recording system.

8 . The system of claim 1 , wherein all data tracks of the data band have a substantially uniform effective track width.

9 . A method comprising:
receiving an instruction to write data to a data band of consecutive data tracks on the storage medium according to a consecutive track order; and writing the data to the data band according to the consecutive track order, the data band including a first series of alternating data tracks and a second series of alternating data tracks interlaced with the first series, wherein each data track of the first series overlaps a previously-written track by a first offset and each data track of the second series overlapping a previously-written data track by a second different offset.

10 . The method of claim 8 , wherein the first offset is a non-zero offset and the second offset is a zero offset.

11 . The method of claim 8 , wherein the data tracks of the first series have a different written track width than the data tracks of the second series.

12 . The method of claim 8 , further comprising:
writing data of a first linear density to the first series of alternating tracks in the data band and writing data of a second linear density to the second series of alternating data tracks in the data band.

13 . The method of claim 8 , wherein data tracks of the data band are arranged according to a uniform track pitch.

14 . The method of claim 8 , wherein the data band of consecutive data tracks is a shingled data band in a shingled magnetic recording system.

15 . A method comprising:
writing data to a first subset of consecutive data tracks in a data band by generating a magnetic field of a first width at the surface of a storage medium; writing data to a last data track in the data band by generating a magnetic field of a second different width at the surface of the storage medium, the second different width smaller than the first width.

16 . The method of claim 13 , wherein the data band has a uniform track pitch.

17 . The method of claim 13 , writing data to a last data track in the data band further comprises shifting a center of the last data track closer to an adjacent data track when reducing width of the magnetic field from the first width to the second width.

18 . The method of claim 13 , wherein writing the data to the last data track of the consecutive data tracks in the data band further comprises decreasing power of a heat source of a heat-assisted magnetic recording (HAMR) head.

19 . The method of claim 13 , wherein all data tracks in the data band are defined by a substantially uniform effective track width.

20 . The method of claim 13 , wherein the data band is a shingled data band.

Assignees

• Seagate Technology Llc

Inventors

• Granz Steven
• Gage Edward
• Chu Alfredo
• Zhu Wenzhong

Classifications

• G11B2005/0021

  Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal · CPC title

• G11B7/1263 Primary

  Power control during transducing, e.g. by monitoring · CPC title

• G11B5/6088

  Optical waveguide in or on flying head · CPC title

• G11B20/1217 Primary

  on discs · CPC title

• G11B5/012

  Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) · CPC title