Magnetic recording apparatus and controlling method of magnetic recording apparatus

Patent metadata

Field	Value
Publication number	US-9734846-B2
Application number	US-201515301999-A
Country	US
Kind code	B2
Filing date	Apr 16, 2015
Priority date	Apr 22, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

In case of deleting shingle-recorded data on a recording medium, it enables to completely delete the data with the number of writing times less than the number of writing times in data recording. To do so, a magnetic recording apparatus, which records the data on the recording medium in a first direction with a writing unit, controls movement of a relative position of the recording medium and the writing unit such that a quantity of the movement in a second direction perpendicular to the first direction in the data deletion by overwriting another data is larger than a quantity of the movement in the second direction in the data recording.

First claim

The invention claimed is:

1. A magnetic recording apparatus comprising:
a writing unit configured to form a recording column extending in a first direction, by applying a recording magnetic field to a recording medium;
a moving unit configured to move a relative position of the recording medium and the writing unit to a second direction perpendicular to the first direction; and
a controlling unit configured to control the writing unit and the moving unit such that, on the recording medium, the recording columns mutually adjacent in regard to the second direction partially overlap in the second direction,
wherein the controlling unit controls the moving unit such that a quantity of movement in the second direction in a case of deleting information written on the recording medium by overwriting with the writing unit another information on the recording column in which the information has been written is larger than a quantity of movement in the second direction in a case of writing information on the recording medium with the writing unit, and
wherein the writing unit, the moving unit, and the controlling unit are implemented by at least one circuit.

2. The magnetic recording apparatus according to claim 1 , wherein the controlling unit controls the moving unit such that, in the case of writing information with the writing unit, the quantity of the movement in the second direction when deleting information is equal to or smaller than a length T of the recording column in the second direction formed on the recording medium.

3. The magnetic recording apparatus according to claim 1 , wherein, the controlling unit raises a magnetic force of the recording magnetic field applied to the recording medium when deleting information as compared with a magnetic force applied when writing information.

4. A magnetic recording method comprising steps of:
writing, with a writing unit, a recording column extending in a first direction, by applying a recording magnetic field to a recording medium;
moving a relative position of the recording medium and the writing unit to a second direction perpendicular to the first direction; and
controlling the writing step and the moving step such that, on the recording medium, the recording columns mutually adjacent in regard to the second direction partially overlap in the second direction,
wherein, in the controlling step, the moving step is controlled such that a quantity of movement in the second direction in a case of deleting information written on the recording medium by overwriting another information on the recording column in which the information to be deleted has been written is larger than a quantity of movement in the second direction in a case of writing information on the recording medium in the writing step, and
wherein the writing step, the moving step, and the controlling step are performed by a single circuit or separate circuits.

5. The magnetic recording method according to claim 4 , wherein, in the controlling step, the moving step is controlled such that, in the case of writing information in the writing step, the quantity of the movement in the second direction when deleting information is equal to or smaller than a length T of the recording column in the second direction formed on the recording medium.

6. The magnetic recording method according to claim 4 , wherein, in the case of writing information in the writing step, a controller raises a magnetic force of the recording magnetic field applied to the recording medium when deleting information as compared with a magnetic force applied when writing information.

7. A non-transitory computer-readable storage medium storing a program for causing a computer to perform a magnetic recording method, the method comprising steps of:
writing, with a writing unit, a recording column extending in a first direction, by applying a recording magnetic field to a recording medium;
moving a relative position of the recording medium and the writing unit to a second direction perpendicular to the first direction; and
controlling the writing step and the moving step such that, on the recording medium, the recording columns mutually adjacent in regard to the second direction partially overlap in the second direction,
wherein, in the controlling step, the moving step is controlled such that a quantity of movement in the second direction in a case of deleting information written on the recording medium by overwriting another information on the recording column in which the information to be deleted has been written is larger than a quantity of movement in the second direction in a case of writing information on the recording medium in the writing step, and
wherein the writing step, the moving step, and the controlling step are performed by a single circuit or separate circuits.

Assignees

• Canon Kk

Inventors

• Umeda Yoshinobu

Classifications

• G11B20/1217

  on discs · CPC title

• G11B2020/1238

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

• G11B5/024 Primary

  Erasing · CPC title

• G11B5/012

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