Heat-assisted shingled magnetic recording with variable track widths

Patent metadata

Field	Value
Publication number	US-2017330591-A1
Application number	US-201615154010-A
Country	US
Kind code	A1
Filing date	May 13, 2016
Priority date	May 13, 2016
Publication date	Nov 16, 2017
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

1 . A system comprising:
a storage medium; a heat-assisted magnetic recording (HAMR) head with a heat source; and a storage device controller configured to operate the HAMR head to write data to a data band of consecutive data tracks in a consecutive track order while dynamically altering a power level of the heat source to write the data to some data tracks of the data band, wherein the data band includes a first series of alternating data tracks and a second series of alternating data tracks interlaced with the first series, and each data track of the first series overlaps a previously-written track by a first offset and each data track of the second series overlaps a previously-written track by a second offset different than the first offset.

2 . The system of claim 1 , wherein the storage device controller is configured to alternate a power level of the heat source for data writes to alternating data tracks in the data band.

3 . 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.

4 . (canceled)

5 . (canceled)

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 executing the instruction by writing the data to the data band according to the consecutive track order while dynamically altering a power level of the heat source to write data to some data tracks in the data band, wherein the data band includes a first series of alternating data tracks and a second series of alternating data tracks interlaced with the first series, and each data track of the first series overlaps a previously-written track by a first offset and each data track of the second series does not overlap any previously-written data track.

10 . The method of claim 9 , wherein executing the instruction further comprises:
alternating a power level of the heat source for data writes to alternating data tracks in the data band.

11 . The method of claim 9 , 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.

12 . (canceled)

13 . (canceled)

14 . The method of claim 9 , wherein data tracks of the data band are arranged according to a uniform track pitch.

15 . The method of claim 9 , wherein the data band of consecutive data tracks is a shingled data band in a shingled magnetic recording system.

16 . The method of claim 9 , wherein all data tracks of the data band have a substantially uniform effective track width.

17 - 20 . (canceled)

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

• G11B7/126

  Circuits, methods or arrangements for laser control or stabilisation · CPC title

• G11B2020/1238

  track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located · CPC title

• G11B5/6088

  Optical waveguide in or on flying head · CPC title

• G11B7/1267

  Power calibration · CPC title