JPH10177718A - Magnetic disk, magnetic disk device and formation of substrate for magnetic disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify manufacturing processes and to reduce the cost by forming an area to be in contact with a head slider into a pattern of projecting put arrays and also making a floating amt. reference plane of this contact area higher than that of an information area. SOLUTION: The substrate for the magnetic disk 3 can be produced by injection molding using a stamper applied to an optical disk, etc., and in the case of a flat type magnetic disk, a CSS zone 3a can be formed with the pit arrays at the same time that the shape of the substrate for the magnetic disk is formed. Then, in the case of a discrete type magnetic disk, a CSS zone 3a can be formed with the pit arrays at the same time that the shape of the substrate of the magnetic disk is formed, while projecting and recessed parts of a data zone 3b can also be formed. Consequently, the magnetic disk 3 having the CSS zone 3a can be produced in the same number of processes as a magnetic disk without a CSS zone 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk for recording and reproducing information by a magnetic recording method, a magnetic disk device using the magnetic disk, and a method of forming a magnetic disk substrate of the magnetic disk.

[0002]

2. Description of the Related Art The density of magnetic disks has been increasing year by year, and has recently been increasing at a rate of 60% / year. This increase in density is due to the MR head
This is possible by adopting a head or improving the material of the magnetic medium of the magnetic disk. In addition, the distance (spacing) between the magnetic disk and the magnetic head is reduced, for example, a value smaller than 50 nm. This is also possible. In order to achieve such spacing, the surface of the magnetic disk must have a surface roughness less than the spacing, for example, a mirror surface. However,
A normal magnetic disk device employs a so-called CSS (contact start / stop) in which the magnetic disk and the head slider on which the magnetic head is mounted are in contact with each other at the time of start and stop. When a mirror surface is used, the true contact area between the magnetic disk and the head slider increases, causing stiction.

In order to achieve both the mirror finishing of the magnetic disk and CSS, a recent magnetic disk device has a magnetic disk and a head slider on which a magnetic head is mounted in addition to an information recording area (data zone). A contact area (CSS zone) for contact is provided. That is, the data zone in which data is read / written is mirror-finished, and the CSS zone in contact with the head slider is roughened (textured) so that stiction does not occur.
The mirroring of the magnetic disk and CSS are compatible. As a texturing method, a polishing method of polishing the surface of the magnetic disk substrate in the CSS zone with a polishing tape is generally used.

[0004]

However, when this method is used, the average height plane (flying height reference plane) of the data zone is used.
The average height plane (flying height reference plane) of the CSS zone is lower. Therefore, there is a disadvantage that the head slider flying in the CSS zone may be inclined when moving from the CSS zone to the data zone, or may crash in an extreme case. To solve this drawback, CSS
The surface of the magnetic disk substrate in the zone is made higher in advance than the surface of the magnetic disk substrate in the data zone, and after polishing, the average height surface of the CSS zone (flying height reference surface) and the average height surface of the data zone (flying height) A method of aligning the reference plane has been proposed.

However, in this method, when a CSS zone is formed, a portion other than the CSS zone is once covered with a resist or the like, a film is adhered only to the CSS zone by sputtering or the like, and then the resist or the like is removed. This makes the process complicated and unsuitable for mass production. Therefore, the magnetic disk substrate is formed of aluminum and CS
A method has been proposed in which a crater-shaped convex portion is formed by irradiating the surface of a magnetic disk substrate in the S zone with a laser beam ("Laser Texturing for All").
ow-fly-height media ", R. Ra
njan, J .; Appl. Phys. 69 (8), 15
April 1991). In this method, the difference between the average height plane (flying height reference plane) of the CSS zone and the average height plane (flying height reference plane) of the data zone can be adjusted by adjusting the density of the protrusions. The movement of the head slider from the zone to the data zone can be performed without any obstacle.

However, when a convex portion is formed in a CSS zone of a magnetic disk, it can be applied to a magnetic disk composed of an opaque magnetic disk substrate made of metal or the like which does not transmit laser light. When applied to a magnetic disk made of a transparent magnetic disk substrate made of a transparent glass, resin, or the like, it is necessary to adopt one of the following three methods. The first method is to increase the intensity of laser light. Since the light transmittance of the magnetic disk substrate is large, the intensity of the laser light of the laser oscillator is increased,
This is a method in which the absorptance of laser light to the magnetic disk substrate is improved and sufficient energy is supplied to form the projections.

A second method is to make the oscillation wavelength of laser light shorter than the wavelength of visible light. FIG. 12 is a diagram showing the wavelength dependence of the light transmittance of a resin material. APO (Amorphous Po) which is sometimes used for an optical disc is shown.
PC (Poly Carbonat) used for ly olefin (resin) resin and CD (compact disc)
e), PMMA (Pol
y Methyl Meta Acrylate). Visible light wavelength range (400 nm to 7
00 nm) or longer, the transmittance is 90% or more in any resin, but the transmittance sharply decreases in the wavelength region shorter than the visible light wavelength region. For this reason, the laser beam emitted from the laser oscillator has a shorter oscillation wavelength than the wavelength of visible light, thereby improving the absorptivity of the laser beam to the magnetic disk substrate, and supplying sufficient energy for forming the projections. A third method is to make the surface of the magnetic disk substrate opaque. In this method, an opaque film or the like that does not transmit laser light is applied on the magnetic disk substrate to improve the absorptance of the laser light with respect to the magnetic disk substrate, and to supply sufficient energy for forming the protrusions.

However, the first method requires a high-output laser oscillator. However, since this laser oscillator is generally expensive, there has been a problem that the magnetic disk producing apparatus itself is also expensive. . In the second method, a laser oscillator having a wavelength shorter than the wavelength of visible light is required. However, since this laser oscillator is also generally expensive, there is a problem that the magnetic disk making device itself is also expensive. was there. In addition, the third method requires a device for depositing an opaque film on the magnetic disk substrate in addition to the laser oscillator, so that the magnetic disk producing device itself becomes expensive, and the magnetic disk substrate is expensive. The process is complicated because an additional step of applying an opaque film to the
There was a problem that the cost was high.

The present invention has been made in view of the above circumstances, and has a magnetic disk which has an appropriate head slider contact area and can be manufactured at a low cost by a simple process, and a magnetic disk drive using the magnetic disk. And a method for forming a magnetic disk substrate of the magnetic disk.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic disk on which information is recorded and reproduced by a magnetic head mounted on a head slider floating on the surface. Formed on the inner or outer peripheral surface so that the area to be formed is a convex pit row and the flying height reference plane of the contact area is higher than the flying height reference plane of the information recording area. Is achieved by

According to the above configuration, since the head slider has an appropriate contact area with the head slider, it is possible to prevent the head slider from tilting when moving from the contact area to the information recording area.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiment described below is a preferred specific example of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 is a perspective view showing a configuration example of a hard disk drive which is a first embodiment of the magnetic disk drive of the present invention. The hard disk drive 1 is provided with a spindle motor 9 disposed behind a plane portion of a housing 2 formed of an aluminum alloy or the like, and a magnetic disk 3 driven to rotate at a constant angular velocity by the spindle motor 9. Have been. Further, an arm 4 is swingably attached to the housing 2 around a pivot 4a. A voice coil 5 is attached to one end of the arm 4, and a head slider 6 is attached to the other end of the arm 4.

[0014] Magnets 7a and 7b are mounted on the housing 2 so as to hold the voice coil 5 therebetween.
A voice coil motor 7 is formed by the voice coil 5 and the magnets 7a and 7b. Head slider 6
Are formed on both sides of the lower surface thereof with rails acting as air bearing surfaces, and tapered portions are formed on the tip side of these rails. And
A magnetic head 8 is mounted on the rear end surface of one of the rails.

In such a configuration, when the spindle motor 9 is driven, the magnetic disk 3 rotates at a constant angular velocity. Then, when air flows in from the tapered portion on the tip end side of the rail of the head slider 6 with the rotation of the magnetic disk 3, the air flows along the rail. And
When this air flows out from the rear end side of the rail, the head slider 6 flies at a minute interval (floating amount) from the surface of the magnetic disk 3 due to the levitating force. That is, the head slider 6 flies due to an increase in pressure due to the gap between the head slider 6 and the surface of the magnetic disk 3 decreasing from the leading end toward the trailing end in the running direction.

When a current is externally supplied to the voice coil 5, the arm 4 moves around the pivot 4a based on the magnetic field of the magnets 7a and 7b and the force generated by the current flowing through the voice coil 5. Rotate. As a result, the head slider 6 attached to the other end of the arm 4 moves substantially in the radial direction of the magnetic disk 3 while flying above the surface of the magnetic disk 3 as the magnetic disk 3 rotates. Therefore, the magnetic head 8 mounted on the head slider 6 performs a seek operation on the magnetic disk 3.

FIG. 2 is a perspective view showing an embodiment of the magnetic disk of the present invention. The magnetic disk 3 uses a magnetic disk substrate made of resin, and has a ring-shaped CSS zone 3a on the inner circumference side and a data zone 3b on the outer circumference side of the CSS zone 3a. Rectangular pits as shown in FIG. 3 are formed in the CSS zone 3a. Whether the data zone 3b is formed to be smooth (flat) at the same height as the bottom of the pit,
Alternatively, irregularities (discrete) having the same height at the top of the pit and the top of the projection are formed. The CSS zone 3a may be provided in an annular shape on the outer peripheral side of the magnetic disk substrate. The shape of the pit can be arbitrarily selected, such as a column shape.

The magnetic disk substrate of the magnetic disk 3 can be formed by an injection molding method using a stamper used for an optical disk or the like. In the case of a flat magnetic disk, the shape of the magnetic disk substrate is changed. At the time of molding, it is possible to form a pit row in the CSS zone 3a at the same time. Also, in the case of a discrete type magnetic disk, when forming the shape of the magnetic disk substrate,
At the same time, it is possible to form a pit row in the CSS zone 3a and to form irregularities in the data zone 3b. Therefore, the magnetic disk 3 having the CSS zone 3a can be manufactured with the same number of processes as the magnetic disk without the CSS zone 3a without complicating the process or increasing the cost. Further, since a large number of magnetic disk substrates can be formed from one stamper, there is almost no variation in texture.
The step of inspecting and managing the texture performed for each sheet can be omitted.

Here, the conventional stamper is smooth over the entire surface, but the stamper for producing the magnetic disk 3 of this embodiment has a concave recess at a position corresponding to the CSS zone 3a where the pit row is formed. Is formed.
However, since the formation of the concave depression does not roughen the surface of the region where the concave depression is not formed, the spacing should be reduced in the data zone 3b of the magnetic disk 3 created by the stamper. There is nothing to hinder. The average height of the pit rows formed in the CSS zone 3a, that is, the flying height reference surface, can be freely adjusted by adjusting the depth of the concave depression or changing the density, for example, the width of the concave depression. It is possible. In this embodiment, the magnetic disk substrate is formed by injection-molding a resin. However, the magnetic disk substrate may be formed by, for example, stamping and molding glass or soft metal.

FIG. 4 is a sectional side view showing a detailed example from the CSS zone 3a to the data zone 3b of the flat type magnetic disk 3 according to the second embodiment of the present invention. The pits in the CSS zone 3a move from the inner peripheral side to the outer peripheral side of the magnetic disk 3,
It is formed to change gradually. That is, the depth of the concave portion of the pit formed in the CSS zone 3a is the same as the height of the surface of the data zone 3b, and the height of the convex portion of the pit is constant up to a predetermined radial position of the CSS zone 3a. ,
It is formed so as to gradually decrease as it approaches the data zone 3b from there. In this example, the maximum value of the convex portion of the pit formed in the CSS zone 3a is 50 nm when the surface of the data zone 3b is 0. Also,
The ratio of the width of the convex portion to the concave portion of the pit formed in the CSS zone 3a is 2: 1. Therefore, the average height of the pit row formed in the CSS zone 3a and the surface of the data zone 3b, that is, the flying height reference surface is 44 nm up to the predetermined radius position of the CSS zone 3a, but the data zone 3b , Gradually decreases, and becomes 0 in the data zone 3b.

Such a structure is employed, for example, when the pits are formed so as to have the same height over the entire area of the CSS zone 3a, the flying height of the head slider 6 is limited to the CSS zone 3a.
This is to prevent abrupt changes at the boundary between the data zone 3a and the data zone 3b, which adversely affect the recording and reproduction of data and cause the head slider 6 to collide with pits.
In this example, the flying height of the head slider 6 was 94 nm up to a predetermined radius position of the CSS zone 3a.
From there, it gradually decreases as approaching the data zone 3b and becomes 50 nm in the data zone 3b, so that there is no adverse effect on data recording / reproduction, and the head slider 6 does not collide with the pit.

In the above-described embodiment, the flying height reference surface of the CSS zone 3a is changed to the flying height of the data zone 3b by keeping the ratio of the width of the convex portion to the concave portion of the pit constant and changing the height of the convex portion of the pit. Although it was made to be higher than the quantity reference plane, the present invention is not limited to this.For example, the height of the convex portion of the pit is constant, and the ratio of the width of the convex portion to the concave portion of the pit is changed, for example, the width of the convex portion. May be gradually narrowed and the width of the concave portion is gradually widened so that the flying height reference surface of the CSS zone 3a is higher than the flying height reference surface of the data zone 3b. Also, by combining these, the flying height reference surface of the CSS zone 3a may be higher than the flying height reference surface of the data zone 3b.

FIG. 5 shows a third embodiment of a magnetic disk according to the present invention.
FIG. 4 is a sectional side view showing a detailed example from an SS zone 3a to a data zone 3b. The pits of the CSS zone 3a are formed so as to gradually change from the inner peripheral side to the outer peripheral side of the magnetic disk 3. That is,
The height of the pits formed in the CSS zone 3a;
The height of the convex portion formed in the data zone 3b is the same, and the depth of the concave portion of the pit is constant up to a predetermined radial position of the CSS zone 3a, and gradually becomes deeper as approaching the data zone 3b therefrom. It is formed so that it becomes.
In this example, when the minimum value of the depth of the concave portion of the pit formed in the CSS zone 3a is 0, the maximum value of the depth of the concave portion formed in the data zone 3b is 200 nm. In addition, the ratio of the width of the convex portion to the concave portion of the pit formed in the CSS zone 3a and the ratio of the width of the convex portion to the concave portion of the data zone 3b are 2: 1. Therefore, CSS zone 3
The average height of the pit rows formed in the data zone 3a and the irregularities formed in the data zone 3b, that is, the flying height reference surface was 44 nm up to a predetermined radius position of the CSS zone 3a, but the data zone 3b , Gradually decreases, and reaches 30 nm in the data zone 3b.

The reason why such a structure is adopted is that, for example, when the pits are formed so as to have the same depth over the entire area of the CSS zone 3a, the flying height of the head slider 6 is reduced.
This is to prevent abrupt changes at the boundary between the data zone 3a and the data zone 3b, which adversely affect the recording and reproduction of data and cause the head slider 6 to collide with pits.
In this example, the flying height of the head slider 6 was 94 nm up to a predetermined radius position of the CSS zone 3a.
From there, it gradually decreases as approaching the data zone 3b, and becomes 30 nm in the data zone 3b. Therefore, there is no adverse effect on data recording / reproduction, and the head slider 6 does not collide with the pit.

In the above-described embodiment, the flying height reference surface of the CSS zone 3a is changed by changing the depth of the recessed portion of the pit while keeping the ratio of the width of the projected portion to the recessed portion of the pit constant. Although it was made to be higher than the reference plane, it is not limited to this.For example, the depth of the concave portion of the pit is kept constant, the ratio of the width of the convex portion to the concave portion of the pit is changed, for example, the width of the convex portion is gradually increased. And the width of the recess is gradually widened so that the flying height reference surface of the CSS zone 3a is higher than the flying height reference surface of the data zone 3b. In addition, the flying height reference surface of the CSS zone 3a may be higher than the flying height reference surface of the data zone 3b in combination with the above.

FIG. 6 shows a stamper forming process for forming the magnetic disk substrate of the magnetic disk 3 described above.
This will be described with reference to FIG. First, a resist 21 is applied to the surface of a disk-shaped glass master 20 by spin coating or the like. Since the surface of the glass master 20 is mirror-finished, the surface of the applied resist 21 also has a mirror surface reflecting the surface properties of the glass master 20 (FIG. 6A).
After applying the resist 21, a pattern of pits to be formed on the magnetic disk 3 is drawn on the surface of the resist 21 by using a laser oscillator 22. At this time, if the resist 21 is a positive type resist, the portion irradiated with the laser beam L flows down upon development, so that the pit portion is not irradiated with the laser beam L, and the portion other than the pit is not irradiated with the laser beam L. A pattern is drawn by irradiating L (FIG. 6B).

After drawing the pit pattern, the resist 21 is developed. As a result, the resist 21 at a portion where the laser beam L has not been irradiated remains (FIG. 6C). After the resist 21 is developed, the surface of the glass master 20 is coated with Ni.
(Nickel) is electrolessly plated (FIG. 7D). Further, Ni is electrolytically plated on the surface of the electroless plating layer 23 (FIG. 7E). As a result, Ni is deposited on the surface of the glass master 20 to form a stamper composed of the electroless plating layer 23 and the electrolytic plating layer 24. Here, the reason for performing the electroless plating and the electrolytic plating is as follows. Electroless plating has a low deposition rate, but since no bubbles are generated in the plating bath during the plating step, a plating layer having no defects can be formed. On the other hand, in the electrolytic plating, although the deposition rate is high, bubbles are generated in the plating bath during the plating process, so that the bubbles may be involved in the plating layer and defects may occur. Therefore, first, in order to improve the surface transferability when used as a stamper, the electroless plating layer 23 having no defect even if the man-hour is taken is formed, and then the electroless plating layer 23 when used as a stamper is formed. In order to have a thickness that can withstand the molding pressure, the electrolytic plating layer 24 is formed without any man-hour even if there is a defect.

Finally, the electroless plating layer 23 and the electroplating layer 24 are separated from the glass master 20 to form a stamper 25 (FIG. 7F). As can be seen from the stamper forming process described above, the remaining portions of the resist 21 on the glass master 20 become the pit row forming portions of the CSS zone 3a. Further, since the data zone 3b is a place where the surface properties of the glass master 20 are directly reflected without passing through the resist 21, the surface roughness of the data zone 3b is almost the same as the surface roughness of the glass master 20 Ra = The value is about 0.5 mm.

The injection molding process of the magnetic disk substrate using the stamper 25 thus prepared will be described with reference to FIG. Here, the shape of the magnetic disk substrate is, for example, an outer diameter of 65 mm, an inner diameter of 20 mm, and a thickness of 1.2 m.
m disk shape. As the resin material of the magnetic disk substrate, for example, APO (Amorphus PolyOr)
efin) resin is used. In addition, the injection molding machine
For example, as shown in FIG.
It has. A stamper 2 is provided on one end surface of the fixed mold 26.
5 is provided and a cavity 28 filled with resin is provided. Further, a gate is provided that penetrates from the other end surface of the fixed mold 26 to the center of the cavity 28 and guides the resin into the cavity 28. The movable mold 27 is provided with a cutter 29 for cutting a portion to be a center hole of the magnetic disk substrate.

First, the stamper 2 is mounted on the wall of the cavity 28.
5 and move the movable mold 27 to the cavity 2.
8 is closed (FIG. 9A). Then, the resin 30 is filled into the cavity 28 through the gate (FIG. 9B).
After filling the resin 30, the cutter 29 is projected into the cavity 28 to cut the inner diameter of the resin 30 (FIG. 9).
(C)). Next, the resin 30 is cooled and solidified (FIG. 9).
(D)), the cutter 29 is returned into the movable mold 27, and the movable mold 27 is moved to open the cavity 28 (FIG. 9).
(E)). Finally, the magnetic disk substrate 31 and the sprue (portion of the inner diameter of the resin 30 cut by the cutter 29) are taken out of the cavity 28, the magnetic disk substrate 31 is transported to the next step, and the sprue is discarded (FIG. 9
(F)). In this example, the stamper 25 is connected to the fixed mold 2.
6, the process for injection molding by attaching to the movable mold 27 is basically the same as the above process.

The magnetic disk substrate 31 obtained as described above
Was performed by a CSS tester using the magnetic disk 3 prepared by the above method. The used head slider is a normal TPC (Transverse Pressu).
re Control) slider and type 19 suspension. The size of this head slider is a nano-slider, 2 mm in length, 1.6 mm in width, and 0.43 mm in thickness. 3600 rpm magnetic disk 3
When the CSS test was started, the dynamic friction coefficient between the head slider and the magnetic disk 3 at the start of the CSS test was 0.2, and the dynamic friction coefficient between the head slider and the magnetic disk 3 at the end of the 20,000 CSS tests was 0.3. Good CSS characteristics were obtained in which the values of the coefficient of dynamic friction at the start of the CSS test and at the end of the 20,000 tests were almost the same. Incidentally, the shape and the like of the magnetic disk can be variously changed and changed.

FIG. 10 is a plan view showing a main part of a configuration example of a hard disk device according to a second embodiment of the magnetic disk device of the present invention. The same components as those of the hard disk device 1 shown in FIG. Is attached. FIG.
(A) is an AA sectional side view, and (B) is a BB sectional side view. This hard disk device, when the flying height of the head slider 6 in the CSS zone 3a of the magnetic disk 3 becomes extremely larger than the flying height of the head slider 6 in the data zone 3b, causes the flying of the head slider 6 in the CSS zone 3a. This device can reduce or equalize the amount, that is, the flying height of the head slider 6 in the data zone 3b, that is, the difference between the flying height reference surface and the data zone 3b. The arm 4 has an arm dimple 11. Also, the head slider 6 is moved to the CSS zone 3a.
In the position of the upper cover 10 facing the position of the arm dimple 11 when it is located at
Is provided. An elastic body 12 such as a sponge or a spring is arranged between the arm 4 and the pivot 4a.

In such a configuration, when the head slider 6 is located in the CSS zone 3a, the arm 4 is forced down by a load because the arm dimple 11 and the upper cover dimple 10a are in contact with each other. Can be At this time, the elastic body 12 is compressed. Therefore, the head slider 6 flies while being suppressed to a predetermined flying height. Then, the head slider 6 is moved to the data zone 3b.
, The arm dimple 11 is released from the upper lid dimple 10a, so that the elastic body 12 is restored, and the arm 4 is pushed up with the load removed. Therefore, the head slider 6 flies at a predetermined flying height.
By providing such a load means, a change in the flying height of the head slider 6 when the head slider 6 moves from the CSS zone 3a to the data zone 3b can be reduced or eliminated.

[0034]

As described above, according to the present invention, the flying height reference surface of the contact area of the head slider and the flying of the information recording area can be reduced without complicating the process and increasing the cost. The difference between the quantity reference planes can be set as small as possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration example of a hard disk drive which is a first embodiment of a magnetic disk drive according to the present invention.

FIG. 2 is a perspective view showing an embodiment of the magnetic disk of the present invention.

FIG. 3 is an exemplary perspective view showing an example of pits formed on the magnetic disk of FIG. 2;

FIG. 4 is a sectional side view showing a main part of a second embodiment of the magnetic disk of the present invention.

FIG. 5 is a sectional side view showing a main part of a third embodiment of the magnetic disk of the present invention.

FIG. 6 is a first view showing a step of forming a stamper for forming a magnetic disk substrate according to an embodiment of the magnetic disk of the present invention.

FIG. 7 is a second view showing a step of forming a stamper for forming a magnetic disk substrate according to the embodiment of the magnetic disk of the present invention;

FIG. 8 is a cross-sectional side view showing an example of a molded part for producing an embodiment of the magnetic disk of the present invention.

FIG. 9 is a cross-sectional side view showing a molding step for producing an embodiment of the magnetic disk of the present invention.

FIG. 10 is a plan view showing a configuration example of a hard disk drive which is a second embodiment of the magnetic disk drive of the present invention.

11 is a sectional side view taken along the line AA and a sectional view taken along the line BB of FIG. 10;

FIG. 12 is a diagram showing a relationship between light transmittance and wavelength of light in a resin.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Hard disk device, 2 ... Housing, 3 ...
Magnetic disk, 3a CSS zone, 3b data zone, 3c pit, 4 arm, 4a
... Pivot, 5 ... Voice coil, 6 ... Head slider, 7 ... Voice coil motor, 7a, 7b
... magnet, 8 ... magnetic head, 9 ... motor, 10a ... upper cover dimple, 11 ... arm dimple, 12 ... elastic body, 20 ... glass master,
21: resist, 22: laser oscillator, 23
..Electroless plating layers, 24 ... electrolytic plating layers, 25
..Stamper, 26 ... fixed mold, 27 ... movable mold, 28 ... cavity, 29 ... cutter, 30 ...
··resin

Claims (13)

[Claims] 1. A magnetic disk on which information is recorded / reproduced by a magnetic head mounted on a head slider flying above a surface, wherein a region in contact with the head slider is a convex pit row, and A magnetic disk formed on the inner or outer peripheral surface such that the flying height reference surface of the contact area is higher than the flying height reference surface of the information recording area. 2. The magnetic disk according to claim 1, wherein the flying height reference plane of the contact area is higher than the flying height reference plane of the information recording area by changing the width of the pit row. 3. The magnetic disk according to claim 1, wherein the flying height reference plane of the contact area is higher than the flying height reference plane of the information recording area by changing the depth of the pit row. 4. The magnetic disk according to claim 1, wherein the contact area is formed on a transparent magnetic disk substrate. 5. A magnetic head device having a head slider on which a magnetic head is mounted, wherein a contact area of the head slider is a convex pit row, and a flying height reference surface of the contact area is information recording. Information is formed in the information recording area by a magnetic head mounted on the head slider flying above the surface, being formed on the surface of the inner or outer periphery so as to be higher than the flying height reference plane of the area. A magnetic disk device comprising: a magnetic disk on which recording and reproduction are performed. 6. When forming a magnetic disk substrate of a magnetic disk on which information is recorded / reproduced by a magnetic head mounted on a head slider flying above the surface, simultaneously with the formation of the surface of the inner peripheral portion or outer peripheral portion thereof. Preferably, the contact area of the head slider is formed as a convex pit row, and the flying height reference surface of the contact area is formed higher than the flying height reference surface of the information recording area. A method for forming a magnetic disk substrate. 7. A magnetic disk on which information is recorded / reproduced by a magnetic head mounted on a head slider flying above the surface, wherein a contact area of the head slider is a convex pit row, and As the flying height reference surface of the contact area gradually decreases as approaching the information recording area,
A magnetic disk formed on the surface of an inner peripheral portion or an outer peripheral portion. 8. The magnetic disk according to claim 7, wherein by changing the width of the pit row, the flying height reference surface of the contact area gradually decreases as approaching the information recording area. 9. The magnetic disk according to claim 7, wherein the flying height reference surface of the contact area gradually decreases as the depth approaches the information recording area by changing the depth of the pit row. 10. The magnetic disk according to claim 7, wherein the contact area is formed on a transparent magnetic disk substrate. 11. A magnetic head device having a head slider on which a magnetic head is mounted, wherein a contact area of the head slider is a convex pit row, and a flying height reference surface of the contact area is information recording. Information is recorded in the information recording area by a magnetic head mounted on the head slider, which is formed on the surface of the inner peripheral portion or the outer peripheral portion so as to gradually decrease as approaching the area, and floats on the surface. A magnetic disk drive comprising: a magnetic disk to be reproduced. 12. When forming a magnetic disk substrate of a magnetic disk on which information is recorded and reproduced by a magnetic head mounted on a head slider flying above the surface,
On the surface of the inner peripheral portion or the outer peripheral portion, a region in contact with the head slider becomes a convex pit row,
A method for forming a magnetic disk substrate, wherein the flying height reference surface of the contact area is formed so as to gradually decrease as approaching the information recording area. 13. A magnetic head device having a head slider on which a magnetic head is mounted, and a region in which information is recorded and reproduced by a magnetic head mounted on the head slider floating on a surface is formed. A magnetic disk in which a region where the head slider comes into contact is formed on the surface of an inner peripheral portion or an outer peripheral portion; and a load is applied when the head slider flies over the contact region, and the head slider records the information. A magnetic disk drive comprising a load means for removing a load when flying over an area.