JP3364470B2 - Manufacturing method of magnetic disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] [0001] The present invention relates to a hard disk drive.
Disk used in storage and floppy disk drives
And a method for producing the same. [0002] 2. Description of the Related Art At present, a typical magnetic disk drive is used.
Hard disk drives already have an areal recording density of 1 Gb
A device exceeding it / sqin has been commercialized, and a few years later
As fast as 10 Gbit / sqin is being discussed for practical use
Intense technological progress is recognized. [0003] The technical requirements for achieving such a high recording density
Behind the increase in linear recording density,
A magnetic resistor capable of reproducing a signal having a track width of several μm with good SN.
This is largely due to the anti-element type head. Also high record
Floating magnetic slider floating on magnetic recording media with density
There is also a demand for a reduction in the amount of airborne
Increased possibility of disk / slider contact due to factors
Great. Under these circumstances, the recording medium
More smoothness is required. The head scans a narrow track accurately.
Tracking servo technology is an important part of
It plays a part. Such tracking servo technology
With current hard disk drives using
Servo signal for tracking at regular angular intervals during
Signal, address information signal, reproduced clock signal, etc.
ing. And in the drive device, from the head
These signals, which are played back at regular intervals,
By detecting and correcting the position, the head
Control is performed so as to accurately scan the track. The above-mentioned servo signal and address information signal,
The playback clock signal, etc., causes the head to run exactly on the track.
The reference signal for the inspection.
High ranking for writing (hereinafter referred to as formatting)
Positioning accuracy is required. Current hard disk drive
Incorporates a high-precision position detection device using optical interference
Using a dedicated servo device (hereinafter referred to as a servo writer)
Position the recording head and perform formatting.
ing. [0006] However, the servo writer
The following issues exist for formatting. That is,
While positioning the head with high precision,
It takes a lot of time to write a signal,
To increase productivity, operate many servo writers simultaneously.
I have to do it. In addition, many servo writers
Installation and maintenance costs a lot of money.
The challenge is that track density increases and the number of tracks increases.
Serious. Therefore, formatting is performed by a servo writer.
Not a master with all servo information written in advance
Disk and the magnetic disk to be formatted
Stack the disks and apply transfer energy from outside
Transfer the master information to the magnetic disk
Have been proposed. As one example, Japanese Patent Application Laid-Open No.
In this example, the magnetic recording medium and
Applying an external magnetic field by bringing the protruding part of the master information carrier into close contact
In this way, magnetic transfer is performed. [0009] SUMMARY OF THE INVENTION
In a conventional magnetic transfer device, a magnetic recording medium and master information are used.
If an abnormal projection exists between the projection of the information carrier and
Contact causes a depression on the surface of the magnetic recording medium.
Live. Also, in this depression, a depression of about 50 nm
There is a small protrusion of about 20 nm around the depression
Would. FIG. 16 shows an optical measurement method for such a protrusion.
The result of the measurement is shown.
Many fine protrusions of about 20 nm exist on the disk surface.
I understand. By the way, in a hard disk drive,
The flying height of the slider from the surface of the magnetic disk
Is about 20 to 30 nm, and 20
If there is a protrusion of about nm,
The magnetic head comes into contact with the magnetic disk,
In such cases, the magnetic head and magnetic disk
Signal clearance and signal recording / reproducing performance
Drop, and the magnetic head physically contacts the magnetic disk
Causes the life of the magnetic head to decrease
Becomes As described above, according to the conventional magnetic transfer method,
There are many protrusions on the disc,
With the issues of raw performance and reduced magnetic head life
Was. The present invention has been made in view of such problems.
Therefore, the signal recording / reproducing performance may be reduced or the magnetic head
Reliable magnetic disk that does not shorten the life of the
The purpose is to provide a manufacturing method for discs.
You. [0012] [MEANS FOR SOLVING THE PROBLEMS] To achieve this object
The method for manufacturing a magnetic disk of the present invention has a ferromagnetic layer
On the recording surface of the magnetic diskTo ba-Nished
rear,Forming a lubricant layer on the magnetic disk,Magnetic
Characteristic part in an array pattern shape corresponding to the predetermined information signal.
The magnetic transfer master formed so as to be
Superimposed on the surface of the
By magnetizing the magnetic part of the star, the magnetic transfer
The arrangement pattern of the information signal of the star is changed to the magnetization pattern of the information signal.
Transfer recording to the magnetic disk as a
YouYou. [0013] DETAILED DESCRIPTION OF THE INVENTION In the present invention, a ferromagnetic layer is provided.
On the recording surface of a rotating magnetic diskTo ba-Nish treatment
AfterForming a lubricant layer on the magnetic disk,
The magnetic part has an array pattern shape corresponding to the predetermined information signal
The magnetic transfer master formed as described above is
Superimposed on the surface of the disk and
By magnetizing the magnetic part of the master, the magnetic transfer
The arrangement pattern of the master information signal is changed to the magnetization pattern of the information signal.
The data is transferred and recorded on the magnetic disk as a
Manufactures magnetic disks for disk drives.You. [0014] [0015] According to the present invention,On magnetic diskBerni
After applyingAfter forming a lubricant layer,Magnetic transfer
To remove foreign substances adhering to the slave
Abnormal protrusion during magnetic transfer because it can be reliably removed before transfer
Can be prevented from occurring. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
This will be described with reference to a plane. (Embodiment 1) Referring to FIGS.
A method for manufacturing a magnetic recording medium according to the embodiment will be described.
Will be explained. FIG. 1 shows a process chart of the present embodiment.
As shown in FIG.
A ferromagnetic layer is formed on a plate to form a magnetic disk body.
After forming a lubricant layer on the main disk, magnetic transfer is performed.
After that, burnishing is performed. Here, a ferromagnetic layer is formed on the disk substrate.
Process and forming lubricant layer
The technology known in the magnetic disk manufacturing process
Can be used. For example, the formation of a ferromagnetic layer
Of evaporation or sputtering means on an aluminum substrate
There is a method of providing a magnetic layer by such a dry plating method.
You. Also, usually, such as vapor deposition or sputtering means on the magnetic layer
Dry plating method or dipping or spin coating
By performing the step of providing a protective layer by the method,
Methods have been taken to protect the layers. In the step of forming the lubricant layer, the lubricant
After immersing the magnetic disk in the solution, pull it up at a specified speed.
By applying lubricant to the entire surface of the magnetic disk
I do. The thickness of the lubricant layer is 15 to 20 angstroms
(1.5-2.0 nm), and the constituent material is carbon
(C), hydrogen (H), oxygen (O), fluorine (F) are desirable
New Next, referring to FIG. 2 to FIG.
The contents of the air transfer step will be described in detail. FIG. 2 shows a magnetic transfer step in the present embodiment.
FIG. 1 is a perspective view showing a part of a device for performing the above in a cross section. Figure
In 2, 1 is a donut disk-shaped magnetic disk.
2, a magnetic pattern is applied to the magnetic disk 1 by an information signal.
Disc-shaped magnetic transfer master for transfer recording
On the surface, a magnetic part made of a ferromagnetic thin film is formed.
Octopus master 2 sandwiches magnetic disk 1 from above and below
It is configured to be arranged as follows. 3 is transcription of master 2
Surface 4 is fixed to the surface of master 2 opposite to transfer surface 3
Positioning ring, 5 holds one of the two masters 2
Upper flange 6 for the other two masters 2
The lower flange for holding the
It is a flexible film that connects the flange 5 or the lower flange 6. Reference numeral 8 denotes a center through hole of the magnetic disk 2 and two
Spind made of an elastic material inserted through the center through hole of the star 2
And 9 are keys for crushing and deforming the spindle 8.
In the cap, the spindle 8 has a cylindrical shape,
The mandrel 9a of the cap 9 is inserted into the. Also,
A predetermined gap is provided between the spindle 8 and the mandrel 9a.
Have been killed. 10 is the spindle 8 or the master 2
Master pedestal 11 for supporting
An air passage for discharging air between the first and second air
An air outlet for discharging air from the passage, 13 is air
The suction pump connected to the outlet, 14 supports the lower flange.
The flange base 15 is provided on the magnetic disk 1 for the master 2
This is a magnet for transferring a magnetic pattern. Next, one of the masters used in the method of the present invention will be described.
An example will be described. FIG. 3 schematically shows a plane of an example of the master 2.
As shown in FIG. 3, one main surface of the master 2,
That is, the surface of the magnetic disk 1 on the side in contact with the ferromagnetic layer surface
, A signal region 2a is formed substantially radially. FIG. 3 is an enlarged view of a portion A surrounded by a dotted line in FIG.
FIG. As shown in FIG. 4, the signal region 2a
Is the digital information signal recorded on the magnetic recording medium, eg
For example, at the position corresponding to preformat recording,
Magnetism made of ferromagnetic thin film with pattern shape corresponding to signal
An information pattern is formed by the sections. Figure 4
The hatched part is composed of a ferromagnetic thin film
The magnetic part. The information pattern shown in FIG.
Clock signal, tracking servo signal, address information
Each area of the information signal etc. is sequentially arranged in the track length direction.
It is a thing. The information pattern shown in FIG. 4 is an example.
Yes, for digital information signals recorded on magnetic recording media
Accordingly, the configuration and arrangement of the information pattern should be determined appropriately.
And For example, like a hard disk drive
First, the reference signal on the magnetic film of the hard disk
And track based on the reference signal
When performing preformat recording of servo signals for
Shows the magnetic properties of a hard disk using a master according to the present invention.
The reference used in advance for preformat recording
Transfer and record only the
The tracking service in the drive housing.
Pre-format recording of signals such as
It may be performed using the magnetic head of the drive.
No. FIG. 5 is an enlarged view of the main part of the master.
In FIG. 5, reference numeral 16 denotes a magnetization pattern on the magnetic disk 1.
Magnetic part consisting of a ferromagnetic thin film for transfer recording
Reference numeral 7 denotes a transfer surface 3 on which the magnetic portion 16 of the master 2 is provided.
It is a groove provided radially. FIG. 6 shows the signal area shown in FIGS.
The master 2 is, as shown in FIG.
Non-magnetic such as Si substrate, glass substrate, plastic substrate
One main surface of the disk-shaped substrate 2b made of a material,
The surface on the side where the surface of the disk 1 comes in contact
Concave part 2c is formed with a plurality of corresponding fine array patterns
The ferromagnetic thin film, which is the magnetic portion 16, is provided in the concave portion 2c of the base 2b.
Is formed by embedding the film.
You. Here, a hard magnetic material is used as the ferromagnetic thin film.
Materials, semi-hard magnetic materials and soft magnetic materials
Types of magnetic materials can be used, and
Any digital information signal can be transferred and recorded. An example
For example, it is possible to use Fe, Co, an Fe—Co alloy, or the like.
it can. The type of magnetic disk on which information signals are recorded
In order to generate a sufficient recording magnetic field regardless of the type,
The larger the saturation magnetic flux density of the conductive material, the better. In particular, 200
High coercivity magnetic disks and magnetic properties exceeding 0 Oersted
For a flexible disk with a thick layer,
Sufficient recording is performed when the total magnetic flux density falls below 0.8 Tesla.
In general, 0.8
Saturation magnetic flux density of Tesla or more, preferably 1.0 Tesla or more
A magnetic material having a degree is used. In addition, ferromagnetic thin film
The thickness depends on the bit length, the saturation magnetization of the magnetic disk, and the magnetic layer.
Depending on the film thickness, for example, a bit length of about 1 μm, a magnetic disk
Saturation magnetization of about 500 emu / cc, strong magnetic field of magnetic disk
When the thickness of the conductive layer is about 20 nm, 50 nm to 500 nm
It may be about nm. FIGS. 7 and 8 show a magnetic recording medium according to this embodiment.
FIG. 9 is a diagram for explaining the operation of the apparatus for performing the copying process.
The operation in this step will be described below. First, as shown in FIG.
As shown, the magnetic disk 1 is sandwiched between two masters 2 and
The positioning ring 4 and the center through hole of the magnetic disk 1 are both
The pindle 8 is inserted. Also, the positioning ring 4 and the magnetic
When the center through hole of the air disk 1 is inserted through the spindle 8
At this time, the upper flange 5 and the lower flange 6 are joined. At this time,
The joint between the positioning ring 4 and the magnetic disk 1 is shown in FIG.
This is the state shown in FIG. That is, the inner diameter of the master 2 is
It is larger than the outer diameter of the spindle 8 and is
There is a small clearance in the thickness direction between discs 1
Are there. Next, the core rod 9a is moved in the direction of the arrow P shown in FIG.
The spindle 8 made of an elastic body
Is compressed and deformed by the cap 9 and is compressed in the thickness direction.
At the same time, the outer diameter increases, as shown in FIG.
The positioning ring 4 and the center through hole of the magnetic disk 1
They are lined from the inside and positioned. spin
Dollar 8 completes positioning of magnetic disk 1 and master 2
When the operation is completed, the spindle 8 remains in the deformed state and the suction pump is
The air is discharged from the air discharge port 12 by the pump 13. this
At this time, the positioning ring 4 is made of an elastic material.
The positioning ring 4 is changed by the exhaust of the suction pump 13.
As shown in FIG. 7C, the magnetic disk 1 and the mass
The clearance between the two becomes zero,
Become. That is, as shown in FIG.
1 has an upper flange 5, a lower flange 6, and two flexible
Ring 7, two masters 2, two positioning rings 4,
It forms a closed space surrounded by pindles 8 and discharges air.
When the air is exhausted from the port 12, the pressure therein becomes atmospheric pressure.
Lower. As a result, the two masters 2
The master 2 receives the force in the direction sandwiching the magnetic disk 1 and
The imaging surface 3 and the surface of the magnetic disk 1 are strongly adhered to each other.
Become. At this time, a protrusion is provided between the magnetic disk 1 and the master 2.
If there is a foreign substance such as
Will be there. The close contact between the magnetic disk 1 and the master 2 is completed.
Then, connect the magnet 15 to the master 2 as shown in FIG.
And apply the magnetic field necessary for transfer, and
8 in the circumferential direction of the magnetic disk 1, ie, in FIG.
By rotating the magnetic disk 1 in the direction of arrow B,
Transfer can be performed over the entire circumferential direction. Here, the pattern shape formed on the master is
Transferring the corresponding information signal to the magnetic disk for recording
This will be described in more detail with reference to FIGS. First, the magnet 15 is attached to the magnetic disk 1.
With the magnetic disk 1 close to the central axis,
9 by rotating the magnetic disk 1 in parallel with the magnetic disk 1.
The magnetic disk 1 is previously magnetized in one direction as indicated by the arrow.
(Initial magnetization). Next, as described above, the magnetic disk
With the master 2 positioned on the mask 1 and superimposed,
The star 2 and the magnetic disk 1 are evenly brought into close contact with each other.
As shown in FIG. 8, a magnetic field is applied in a direction opposite to the initial magnetization.
Thereby, the magnetic part 16 of the master 2 is magnetized, and
A predetermined area 1 of the magnetic disk 1 superimposed on the master 2
FIG. 10B shows the pattern shape of the magnetic portion 16 as shown in FIG.
The corresponding information signal is recorded. The arrow shown in FIG.
The mark indicates the magnetization pattern transferred and recorded on the magnetic disk 1 at this time.
The direction of the magnetic field of the FIG. 11 shows the state during the magnetization process.
As shown in FIG. 11, the master 2 is
When the magnetic field is applied to master 2 from outside,
By magnetizing the magnetic part 16, the magnetic disk 1
An information signal can be recorded on the ferromagnetic layer 1c. sand
That is, an arrangement corresponding to a predetermined information signal is provided on the non-magnetic base 2b.
Form magnetic part 11 made of ferromagnetic thin film in column pattern
By using the master 2 configured as
On the magnetic disk 1 as a magnetization pattern corresponding to the
Can be transferred and recorded. Note that the pattern of the master 2 is
As a method of transfer recording to the master 1, as described above, the master
An external magnetic field is applied while the magnetic disk 2 is in contact with the magnetic disk 1
The magnetic part 16 of the master 2 must be
The master 2 on the magnetic disk 1 in that state.
The information signal is recorded even if the contact
Can be recorded. Next, in the present invention, as shown in FIG.
The burnishing process is performed on the bar.
Details of the nish processing step will be described with reference to FIG.
Will be described. FIG. 12 shows a burnisher in this embodiment.
FIG. 3 is a perspective view illustrating an apparatus for performing a processing step.
As shown in FIG. 12, the device for performing burnishing is
Holding the magnetic disk 1 after performing the magnetic transfer step
Spin the spindle 21 to rotate and spin the magnetic disk 1
Clamp mechanism 22 for fixing to dollar 21 and burnish
Support mechanism 2 having burnish head 20 for use
3 and the head support mechanism 23 is cantilevered at its base.
Guide arm 24 and burnish head 20
The magnetic disk is supported via the support mechanism 23 and the guide arm 24.
Burnish that moves and positions on the recording surface of
Head positioning unit 25 and burnish head positioning unit
25, a positioning control unit 26 for controlling the operation of the
A spindle control unit 27 for controlling the operation of the
Control unit for controlling the decision control unit 26 and the spindle control unit 27.
And a roller 28. First, the controller 28
The magnetic disk 1 is rotated at a constant speed by the dollar controller 27.
You. Next, the burnish head positioning unit 25 is
Is controlled by the positioning control unit 26 so as to move in the direction A of FIG.
Between the magnetic disk 1 and the burnishing head 20
Stop at predetermined intervals, for example, at a position of 15 nm.
You. The setting method of this position is shown below. The burnish head positioning unit 25 is
When the magnetic disk 1 and the magnetic disk 1 are located at an arbitrary position,
The distance from the varnish head 20 is measured in advance. So
Between the magnetic disk 1 and the burnishing head 20
Move to make the interval of the predetermined interval, for example, 15 nm
The distance to be calculated is calculated and stored in the controller 28.
You. The controller 28 controls the bus via the positioning control unit 26.
Move the polishing head positioning section 2
15 nm between the burner 1 and the burnishing head 20
Set to. Here, the magnetic disk 1 and burnish
The distance between the head and the pad 20, that is, 15 nm, is
Head for recording and playback with hard disk drive
Is set to a value smaller than the flying height. Thereafter, the state where the magnetic disk 1 is rotated
In the direction B of FIG. 12, ie, the radial direction of the magnetic disk 1.
Position to move burnish head 20
Controlled by the control unit 27, the master is used when performing magnetic transfer.
Burnishing is performed on the surface that has come into contact with 2. this
Abnormal projections on the surface of the magnetic disk 1
In particular, the magnetic disk and the magnetic head during recording / reproduction
Protrusions larger than the clearance of
You can leave. FIG. 13 shows the state after the burnishing process.
The surface condition of the magnetic disk 1 is measured by an optical measuring method.
The results are shown below. Compare with FIG. 12 described in the related art.
For example, after performing the magnetic transfer process, the burnishing process
By performing this, the magnetic disk 1
It can be seen that the number of minute projections has decreased sharply. As described above, according to the present embodiment, the magnetic
By applying a burnishing process after the transfer process,
Improves surface smoothness of magnetic disk on which air transfer has been performed
Signal read / write performance and magnetic head life
A highly reliable device that does not
Wear. (Embodiment 2) Referring to FIG. 14 and FIG.
A method according to the second embodiment of the present invention will be described. FIG. 14 shows a process chart in the present embodiment.
Each step has the same configuration as in the first embodiment.
It is. That is, in the present embodiment,
After forming a ferromagnetic layer on the substrate, burnishing is performed.
After forming lubricant on the magnetic disk,
This is a method for performing a copying process. First, in this embodiment, the burnishing process is performed.
After the process, a magnetic transfer process is performed.
Foreign matter existing on the magnetic disk 1
The master 2 and the magnetic
Prevent the presence of foreign matter between the disc 1
It becomes possible to record and replay signals as in the first embodiment.
Do not reduce the raw performance and the life of the magnetic head.
And a highly reliable device can be realized. In this embodiment, the lubricant is applied.
That the magnetic transfer process is performed after the
Damage caused during magnetic transfer can be prevented beforehand.
You. That is, the magnetic disk 1 and the master 2
When contact is made with carbon, hydrogen, oxygen, etc.
1.5 to 2.0 n
m so that when they contact each other,
To prevent potential damage from occurring.
it can. FIG. 15 shows the magnetic rotation without the lubricant applied.
Observation results of the magnetic disk surface generated when performing the copying
Is shown. FIG. 15A shows a magnetic disk after magnetic transfer.
This figure shows the appearance of the entire surface.
Over the entire surface, especially near the center, in the same direction
It can be seen that the fine scratches have occurred. FIG. 15 (b)
Is an enlarged view of such a fine scratch, and is about 3 to 5 μm.
You can see that it has a depressed shape like a scratch
You. That is, from these observation results, the lubricant
Contact between the magnetic disk 1 and the master 2 without applying
As a result, a fine
Many scratches occur, especially near the center of the disc
I understand. This is, as shown in FIG.
When the magnetic disk 1 and the master 2 come into close contact, the spindle
8 causes the magnetic disk 1 and master 2 to shift
Wake up and do not apply lubricant.
It is considered that a scratch occurs on the surface. Conversely, magnetic disk
Prior to magnetic transfer between master 1 and master 2,
By applying a lubricant, damage is less likely to occur
It became clear from the experimental results. This is lubrication
Acts as a protective film to prevent damage when the agent contacts
To fulfill. As described above, according to the present embodiment, the bar
Perform the magnetic transfer process after the nishing process.
Foreign matter existing on the magnetic disk
Between the master and magnetic disk
It is possible to prevent the presence of foreign matter beforehand. Further, after the step of applying the lubricant, the magnetic transfer is performed.
Due to the process of copying, it may occur when both touch
The potential damage can be prevented beforehand. In this embodiment, the burnishing process is performed.
The magnetic transfer step was performed after the processing step.
Combination, i.e., magnetic transfer after the burnishing process
If you perform the copying process and then perform the burnishing process,
With foreign matter present on the magnetic disk removed in advance
Magnetic transfer can be performed and the surface of the magnetic disk after magnetic transfer
The surface smoothness can be further improved, and signal recording / reproducing
Performance and durability of the magnetic head are further improved,
An expensive device can be realized. In the above example, the burnishing process is performed.
Was performed using a burnishing head, but is not limited to this.
Not for example, for burnishing tape
Or buffing, etc.
Small protrusions are removed by collision energy with small protrusions
Even with such a configuration, the same effect can be obtained. The method of magnetic transfer is not limited to this.
Not specified, but using other methods
A method of bringing the master 1 into contact with the master 2 may be adopted. [0058] As described above, according to the present invention, the varnish
After the processing stepAfter forming a lubricant layer,Magnetic rotation
By performing the copying process, the
Magnetic transfer is possible because foreign substances can be removed in advance.
A foreign object between the master and the magnetic disk
Can be prevented beforehand, and signal recording and playback
Decreases performance or shortens the life of the magnetic head
It is possible to realize a highly reliable device without any problem. [0059] [0060]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process chart showing a method of manufacturing a magnetic disk according to a first embodiment of the present invention. FIG. 2 is an apparatus for performing a magnetic transfer process in the first embodiment of the present invention. FIG. 3 is a plan view illustrating a configuration of a master for performing the magnetic transfer process. FIG. 4 is an explanatory diagram illustrating a configuration of an information signal formed on the master. FIG. 6 is an enlarged perspective view showing a main part of the master. FIG. 6 is a similar sectional view. FIGS. 7A to 7C are cross-sectional views for explaining disk positioning when performing the magnetic transfer process. FIG. 8 is a perspective view illustrating the operation of the apparatus when performing the magnetic transfer step. FIG. 9 is a perspective view illustrating the state of the magnetic disk that has been initially magnetized in the magnetic transfer step. 10. The state of the magnetic disk on which the transfer recording was performed in the magnetic transfer process FIG. 11 is a cross-sectional view illustrating the principle of transfer recording in the magnetic transfer process. FIG. 12 is a perspective view illustrating an apparatus for performing the burnishing process. FIG. 14 is an explanatory view showing a state of a magnetic disk surface after the burnishing process is performed. FIG. 14 is a process diagram showing a method of manufacturing a magnetic disk according to a second embodiment of the present invention. FIG. 16 is an explanatory diagram for explaining a magnetic disk surface when transfer is performed. FIG. 16 is an explanatory diagram showing a state of a magnetic disk surface after a magnetic disk and a master are brought into contact with each other in a conventional technique. DESCRIPTION OF SYMBOLS 1 Magnetic disk 2 Master 2a Signal area 2b Base 15 Magnet 16 Magnetic part 20 Burnish head

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshio Makabe 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-10-269566 (JP, A) JP-A-62- 208431 (JP, A) JP-A-64-55736 (JP, A) JP-A-64-78753 (JP, A) JP-A-10-293923 (JP, A) JP-A-7-129954 (JP, A) JP-A-2-162515 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 5/62-5/86

Claims (1)

(57) [Claims 1] was subjected to a server Nisshu processing on the recording surface of the magnetic disk having a ferromagnetic layer, the magnetic disk
A lubricant layer is formed, and thereafter, a magnetic transfer master formed by forming a magnetic part to have an array pattern shape corresponding to a predetermined information signal is superimposed on the surface of the magnetic disk, and the magnetic transfer master is formed. of by magnetizing the magnetic portion producing how the magnetic disk for a hard disk drive, which comprises transferring the recording to the magnetic disk array pattern of the information signal of the magnetic transfer master as the magnetization pattern of the information signal.