Magnetic recording and reproducing device and magnetic recording and reproducing method

Patent metadata

Field	Value
Publication number	US-2016133293-A1
Application number	US-201514887998-A
Country	US
Kind code	A1
Filing date	Oct 20, 2015
Priority date	Nov 10, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a recording unit, and a reproducing unit. The magnetic recording medium includes a first track including first and second sub-tracks extending in a first direction. The second sub-track is arranged with the first sub-track in a second direction intersecting the first direction. The recording unit records information in the first and second sub-tracks. The reproducing unit reproduces the information recorded in the first and second sub-tracks while opposing the first, second sub-tracks, and a boundary between the first and second sub-tracks. The first sub-track includes first magnetic recording components including first and second components. The second sub-track includes second magnetic recording components including third and fourth components. A first recording symbol is formed of the first and third components. A second recording symbol is formed of the second and fourth components.

First claim

What is claimed is:

1 . A magnetic recording and reproducing device, comprising:
a magnetic recording medium including a first track including
a first sub-track extending in a first direction, and
a second sub-track extending in the first direction, the second sub-track being arranged with the first sub-track in a second direction intersecting the first direction;
a recording unit recording information in the first sub-track and the second sub-track; and a reproducing unit reproducing the information recorded in the first sub-track and the second sub-track while opposing the first sub-track, the second sub-track, and a boundary between the first sub-track and the second sub-track, the first sub-track including a plurality of first magnetic recording components, the first magnetic recording components including a first component and a second component, the second component being adjacent to the first component in the first direction, the second sub-track including a plurality of second magnetic recording components, the second magnetic recording components including a third component and a fourth component, the third component being adjacent to the first component in the second direction, the fourth component being adjacent to the third component in the first direction and adjacent to the second component in the second direction, a first recording symbol being formed of the first component and the third component, a second recording symbol being formed of the second component and the fourth component, the information recorded in the first recording symbol being a first value when a magnetization of the first component is in a first state and a magnetization of the third component is in the first state, the information recorded in the first recording symbol being a second value when the magnetization of the first component is in a second state and the magnetization of the third component is in the second state, the information recorded in the first recording symbol being a third value when the magnetization of the first component is in the first state and the magnetization of the third component is in the second state, the information recorded in the second recording symbol being the third value when a magnetization of the second component is in the second state and a magnetization of the fourth component is in the first state.

2 . The device according to claim 1 , wherein
the information recorded in the second recording symbol is the first value when the magnetization of the second component is in the first state and the magnetization of the fourth component is in the first state, and the information recorded in the second recording symbol is the second value when the magnetization of the second component is in the second state and the magnetization of the fourth component is in the second state.

3 . The device according to claim 1 , wherein the information recorded in the first recording symbol is the third value when the magnetization of the first component is in the second state and the magnetization of the third component is in the first state.

4 . The device according to claim 1 , wherein
the first sub-track further includes a fifth component, the first component being provided between the fifth component and the second component, the first component being adjacent to the fifth component in the first direction, the second sub-track further includes a sixth component adjacent to the fifth component in the second direction, the third component being adjacent to the sixth component in the first direction, a third recording symbol is formed of the fifth component and the sixth component, and the information recorded in the third recording symbol is the first value when a magnetization of the fifth component is in the first state and a magnetization of the sixth component is in the first state.

5 . The device according to claim 4 , wherein
the first sub-track further includes a seventh component, the fifth component being provided between the seventh component and the first component, the fifth component being adjacent to the seventh component in the first direction, the second sub-track further includes an eighth component adjacent to the seventh component in the second direction, the sixth component being adjacent to the eighth component in the first direction, a fourth recording symbol is formed of the seventh component and the eighth component, and the information recorded in the fourth recording symbol is the third value when a magnetization of the seventh component is in the second state and a magnetization of the eighth component is in the first state.

6 . The device according to claim 1 , wherein
the magnetic recording medium further includes a second track including:
a third sub-track extending in the first direction, the third sub-track being arranged with the second sub-track in the second direction; and
a fourth sub-track extending in the first direction, the fourth sub-track being arranged with the third sub-track in the second direction,
the second sub-track is disposed between the first sub-track and the fourth sub-track, the third sub-track is disposed between the second sub-track and the fourth sub-track, a distance between the second sub-track and the third sub-track is longer than a distance between the first sub-track and the second sub-track and longer than a distance between the third sub-track and the fourth sub-track, the recording unit records information in the third sub-track and the fourth sub-track, and the reproducing unit reproduces the information recorded in the third sub-track and the fourth sub-track while opposing the third sub-track, the fourth sub-track, and a boundary between the third sub-track and the fourth sub-track.

7 . The device according to claim 6 , wherein
the third sub-track includes a plurality of third magnetic recording components, the third magnetic recording components including a ninth component and a tenth component, the tenth component being adjacent to the ninth component in the first direction, the fourth sub-track includes a plurality of fourth magnetic recording components, the fourth magnetic recording components including an eleventh component and a twelfth component, the eleventh component being adjacent to the ninth component in the second direction, the twelfth component being adjacent to the eleventh component in the first direction and adjacent to the tenth component in the second direction, a fifth recording symbol is formed of the ninth component and the eleventh component, a sixth recording symbol is formed of the tenth component and the twelfth component, the information recorded in the fifth recording symbol is the first value when a magnetization of the ninth component is in the first state and a magnetization of the eleventh component is in the first state, the information recorded in the fifth recording symbol is the second value when the magnetization of the ninth component is in the second state and the magnetization of the eleventh component is in the second state, the information recorded in the fifth recording symbol is the third value when the magnetization of the ninth component is in the first state and the magnetization of the eleventh component is in the second state, and the information recorded in the sixth recording symbol is the third value when a magnetization of the tenth component is in the second state and a magnetization of the twelfth component is in the first state.

8 . The device according to claim 7 , wherein
the information recorded in the sixth recording symbol is the first value when the magnetization of the tenth component is in the first state and the magnetization of the twelfth compone

Assignees

• Toshiba Kk

Inventors

• Yamada Kenichiro
• Takagishi Masayuki
• Maeda Tomoyuki
• Isowaki Yousuke
• Narita Naoyuki
• Murakami Shuichi

Classifications

• 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

• G11B2020/1238

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

• G11B5/02

  Recording, reproducing, or erasing methods; Read, write or erase circuits therefor · CPC title

• G11B5/82

  Disk carriers · CPC title