IP Library Patent Application 12483762
Patent Application
App. No. 12/483,762

MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING APPARATUS

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Quick Facts
Patent No.
US None
App. No.
12/483,762
Abstract

A magnetic recording medium includes a plurality of recording tracks formed of a magnetic material and a non-magnetic area arranged between the recording tracks to separate each recording track. The non-magnetic area is formed of a non-magnetic material, which can accumulate and retain electric charges. The electric charges accumulated in the non-magnetic area represent servo information.

Claims (19)

1 . A magnetic recording medium comprising:

a plurality of recording tracks formed of a magnetic material; and

a non-magnetic area arranged between the recording tracks to separate each recording track,

wherein said non-magnetic area is formed of a non-magnetic material, which accumulates and retains electric charges.

2 . The magnetic recording medium according to claim 1 , wherein said non-magnetic area is a lamination of a silicon layer, a silicon oxide layer, a silicon nitride layer, and a metal layer stacked on a metal substrate in that order.

3 . The magnetic recording medium according to claim 1 , wherein said non-magnetic area is formed of a ferroelectric material.

4 . The magnetic recording medium according to claim 1 , wherein the electric charges are accumulated in a dot form in said non-magnetic area.

5 . The magnetic recording medium according to claim 4 , wherein the electric charges accumulated in a dot form represent track number information for recognizing said recording tracks.

6 . The magnetic recording medium according to claim 4 , wherein the electric charges accumulated in a dot form represent servo information used for a control to position a magnetic head to said recording tracks.

7 . A magnetic recording apparatus comprising:

the magnetic recording medium according to claim 1 ; and

a magnetic head configured to perform magnetic recording on said recording tracks,

wherein said magnetic head has a conductive probe that detects the electric charges accumulated in said non-magnetic area of said magnetic recording medium.

8 . The magnetic recording apparatus according to claim 7 , wherein said non-magnetic area is a lamination of a silicon layer, a silicon oxide layer, a silicon nitride layer, and a metal layer stacked on a metal substrate in that order.

9 . The magnetic recording apparatus according to claim 7 , wherein said non-magnetic area is formed of a ferroelectric material.

10 . The magnetic recording apparatus according to claim 7 , wherein servo information is recorded by accumulating the electric charges in a dot form in said non-magnetic area of said magnetic recording medium, and the magnetic recording apparatus has a head control part that controls a movement of said magnetic head by extracting the servo information from a detection signal output from said conductive probe.

11 . The magnetic recording apparatus according to claim 10 , wherein said head control part has a track number extraction part configured to extract track number information for recognizing said recording tracks from the servo information represented by said electric charges accumulated in a dot form.

12 . The magnetic recording apparatus according to claim 10 , wherein said head control part has a servo control part configured to create a control signal for controlling an operation to position said magnetic head to said recording tracks based on a detection value of detection of said electric charges accumulated in a dot form.

13 . The magnetic recording apparatus according to claim 7 , wherein said magnetic head performs a magnetic recording and reproduction while contacting said magnetic recording medium.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 23, 2009
From: FUJITSU LIMITED
To: TOSHIBA STORAGE DEVICE CORPORATION
Reel/Frame 023558/0225 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 12, 2009
From: TEGURI, HIRONORI
To: FUJITSU LIMITED
Reel/Frame 022820/0284 →