JP2001176232A - Magnetic head slider and magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease floating variations and the fluctuations in a flying height, to satisfy the floating characteristics at which a floating profile is made constant and to prevent the dust infiltrating between a slider and a medium from being adhered to a recording and reproducing element. SOLUTION: A central pad 14 which can be an air bearing surface is disposed in front of the air inflow direction of an outflow pad 13 mounted with the recording and reproducing element 16, by which head crush damaging a medium surface is prevented and the magnetic head slider excellent in high recording density and high reliability and the magnetic head device may be effectively provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head slider and a magnetic disk drive, and more particularly to a magnetic head slider and a magnetic disk drive excellent in high recording density and high reliability.

[0002]

2. Description of the Related Art In recent years, the introduction of various innovative technologies corresponding to higher recording density has been accelerated in magnetic disk devices.

For example, a giant magnetoresistive head (GMR head) having a reproduction output that is about 3 to 5 times larger than that of a magnetoresistive head (MR head) which is highly sensitive and suitable for reducing the diameter of a disk is currently available. It is starting to be put to practical use. Further, in order to increase the storage capacity, a method is adopted in which the linear recording densities at the inner and outer circumferences of the disk are the same.

In order to put these systems and MR heads and GMR heads whose reproduced waveforms do not depend on the peripheral speed into practical use, the flying characteristics in which the flying height does not change with changes in the peripheral speed are satisfied, and the flying profile (disk A magnetic head slider having a constant flying height trace from the inner periphery to the outermost periphery is required.

[0005] With the demand for higher recording density of magnetic disk drives, demands for higher reliability and extremely small flying height of the head-disk interface have become more and more severe.

[0006] The flying height of a magnetic head slider (also simply referred to as a slider) fluctuates due to various factors such as processing and assembly tolerances, vibrations, and environmental changes such as atmospheric pressure and temperature. If the lower limit of the flying height is smaller than the flying height at which the slider and the medium surface start contacting, the slider may intermittently or continuously contact the medium surface.

Therefore, in order to reduce the flying height, it is necessary to reduce flying variations and flying height fluctuations caused by the above factors. Among the above factors, the largest flying height fluctuations are caused by changes in air pressure around the slider. Is a decrease in flying height.

For this reason, in the conventional magnetic head slider, the air film rigidity is increased by using a negative pressure in order to reduce flying variations and flying height fluctuations due to the above factors, particularly to reduce flying height reduction due to atmospheric pressure change.

However, if dust entering the magnetic disk device from the outside or dust generated from inside the device enters between the medium surface and the slider, and the dust adheres to the slider floating surface, the slider attitude becomes unstable and the slider flies. As a result, a head crash occurs in which the slider is continuously slid and the medium surface is damaged due to a decrease in flying height, an increase in flying height fluctuation, and an increase in contact frequency.

The most probable case of the head crash is that the dust moves along the flow of air and dust smaller than the floating amount at the outflow end adheres to the recording / reproducing element having the minimum floating amount.

As a well-known example of a conventional magnetic head slider, a pair of elongated slider rails extending from an air inflow portion to an air outflow portion are provided in parallel along both sides of a floating surface, and a step portion is provided at an inflow portion of the rail via a step portion. 2. Description of the Related Art A positive pressure slider having a minute step surface is known. (See, for example, Japanese Patent Application Laid-Open No. 6-259912) If the height of the rail surface and the step surface are respectively a recess depth and a step depth, the recess depth is such that the pressure generated in a pair of elongated slider rails is This is a sufficiently large value so that the difference from the atmospheric pressure becomes positive.

Furthermore, in the above-mentioned known example, a catch pad for catching dust is provided in front of the two-rail step slider in the air inflow direction. As a feature of this slider floating surface, one slider rail has two positive pressure peaks near the step portion and near the outflow end, and the magnetic head slider is held at a total of four positive pressure peaks.

Further, when dust enters the air inlet, a pad provided in front of the two-rail step slider captures the dust and does not directly attach the dust to the slider floating surface.

However, in the above-mentioned known example, since no negative pressure is generated on the flying surface, the variation in the flying height and the variation in the flying height are large. When the recess depth is reduced,
Negative pressure is generated near the outflow end of the capturing pad, but the flying side of the slider is lowered so that the capturing pad adversely affects the flying characteristics.

As another conventional example, a pair of side rails are formed along the air bearing surface of a magnetic head slider along both sides to generate a positive pressure over substantially the entire width of the air inflow side end (cross rail). ) Are formed. (See, for example, Japanese Patent Application Laid-Open No. H10-144046) A center pad is provided at the center near the air outflow end, and the recording / reproducing element is held on the center pad. Further, an inclined surface or a step surface is formed on the inflow end side of the cross rail, and a slit for dividing the cross rail is provided at the center of the cross rail.

In the present embodiment, a dust protection wall is provided on the air inflow side of the center pad. However, assuming that the height of the side rail is the recess depth, the height of the dust protection wall is also set to be equal to the recess depth, so a negative pressure is generated near the outflow end of the dust protection wall, and the dust protection wall has a floating characteristic. Adversely affect

[0017]

The above-mentioned conventional positive pressure utilizing type magnetic head slider, for example, Japanese Patent Laid-Open No. 6-25991.
In the device described in Japanese Patent Publication No. 2, no negative pressure is generated on the air bearing surface, so that the floating variation and the floating amount fluctuation are large. If the recess depth is reduced, a negative pressure is generated near the outflow end of the dust capturing pad, but the slider is in a floating attitude in which the inflow side is lowered, and the dust capturing pad adversely affects the flying characteristics of the slider.

In the above-mentioned conventional negative pressure utilizing magnetic head slider, for example, the one described in Japanese Patent Application Laid-Open No. H10-144026, a negative pressure is generated near the outflow end of the dust protection wall, and the dust protection wall has a floating characteristic. And adversely affect the reliability of the head-disk interface.

FIG. 17 shows a magnetic head slider described in the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-144046.
This will be described with reference to FIG. The magnetic head slider 30 has a pair of side rails 31 formed along both sides, and a horizontal rail (cross rail) 32 for generating a positive pressure over substantially the entire width of the air inflow side end.

In the center near the air outflow end,
A center pad 33 is provided.
3 holds a recording / reproducing element 1b. An inclined surface 34 or a step surface 35 is provided on the inflow end side of the cross rail 32.
Are formed. During operation, a positive pressure is generated in the side rail portion, and a negative pressure is generated near the outflow end 15 of the cross rail. One negative pressure portion 20 is generated at the center of the cross rail.

A slit 36 for dividing the cross rail is provided at the center of the cross rail. On the air inflow side of the center pad 33, a semicircular concave dust protection wall 37 is provided at a predetermined interval. Assuming that the height of the side rail is the recess depth, the height of the dust protection wall is also set to be equal to the recess depth.

However, it is necessary to reduce the depth of the recess and increase the negative pressure in order to further reduce the variation in the flying height and the variation in the flying height. However, if the depth of the recess is reduced, the outflow end of the dust protection wall is required. Negative pressure is generated in the vicinity,
The dust barrier will adversely affect the flying characteristics.

It is an object of the present invention to reduce flying variations and flying height fluctuations, satisfy flying characteristics in which a flying profile is constant, and prevent dust entering between a slider and a recording medium from adhering to a recording / reproducing element. It is to be.

[0024]

The above-mentioned object is achieved by providing a pad which can serve as an air bearing surface in the negative pressure type slider in front of the pad on which the recording / reproducing element is mounted in the air inflow direction.

That is, a central pad having an air bearing surface formed on the slider flying surface in front of the air inflow side of the recording / reproducing element, and negative pressure portions formed on both sides of the central pad are provided. As a result, the floating on the slider inflow side is held by the dust capturing center pad and the dust can be collected by the negative pressure portion, so that the subsequent processing of the dust is facilitated.

It should be noted that two side pads having air bearing surfaces may be formed on both sides of the center pad, and a negative pressure portion may be formed between the center pad and the both side pads.
The recording / reproducing element is mounted in a recess surrounded by pads on both sides, side rails formed along both outer sides of the slider flying surface, and recording / reproducing element mounting pads provided on the air outflow end side of the slider. It is also effective that the central pad is formed in front of the pad in the air inflow direction, so that two negative pressure portions are generated in the concave portion when air flows in.

The central pad may be formed in a triangular shape having an acute angle in the air inflow direction, a long and narrow groove in the air inflow direction of the air bearing surface, or a material having a small surface energy may be adhered to the surface. In this case, the fluctuation of the flying height can be suppressed by the damping effect of the vibration of the slider.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the flying surface of a magnetic head slider according to Embodiment 1 of the present invention.

In the slider 1 of the present embodiment, two (one pair) two-side pads 11 (hereinafter, referred to as inflow pads) that can be air bearing surfaces (that is, have air bearing surfaces) are formed on the inflow side. Further, it is composed of a pair of side rails 12 formed along both sides and a pad 13 (outflow pad) formed on the outflow side, which can be one air bearing surface.

On the outflow end of the outflow pad 13, a recording / reproducing element 1b comprising an exposed portion of the MR element of the reproducing MR head and a gap of the electromagnetic induction type magnetic head for recording is mounted. Is provided with a magnetic head 1c and a connection terminal 1d.

Further, in the present embodiment, the outflow pad 13
A central pad (dust capturing pad) 14, which can be an air bearing surface, is provided in front of the air inflow direction. The slider 1 shown in FIG. 1 has two recesses 1 surrounded by an inflow pad 11 and a center pad 14 and a side rail 12.
5 is a negative pressure utilization type slider in which a negative pressure peak occurs.

Moreover, the concave portion 1 where the peak of the negative pressure is generated
Since a positive pressure for causing the slider 1 to fly is generated on both sides of the slider 5, the negative pressure and the positive pressure are balanced, and a stable flying posture can be maintained at a low flying height.

FIGS. 2, 3 and 4 show the inflow pad 11, side rail 12, outflow pad 13 and inflow pad 14 (central pad), respectively. These are a pad surface 21 (contact surface) which comes into contact with the medium surface when the disk is stopped, a step surface 24 (step surface) provided via the step 22 in the air inflow direction, and a step provided via the step 23. It is composed of a surface 25 (recess surface) or the like.

In the drawing, δs and δr indicate the depth of the step surface 24 with respect to the pad surface 21 (step depth) and the depth of the step surface 23 with respect to the pad surface 21 (recess depth), respectively. The step depth of the dust capturing pad 14 is the same as the step depth of the inflow pad 11 and the outflow pad.

FIG. 5 shows a pressure distribution on the air bearing surface of the magnetic head slider according to the first embodiment. Inflow pad 11 shown in FIG.
Further, it can be seen that a negative pressure portion is generated in the two concave portions 15 surrounded by the pad 14 and the side rail 12.

Since the negative pressure acts in the same direction as the pressing load, the load and the air film rigidity are substantially increased, and the negative pressure acts to reduce variations in flying height and fluctuations in flying height. Further, when the disk peripheral speed is high, the negative pressure increases, so that the floating amount on the inner and outer circumferences of the disk becomes uniform, and the floating profile becomes constant.

Next, the effect of the magnetic head slider of the first embodiment will be described with reference to FIG. FIG. 6A is a three-dimensional perspective view of the slider floating surface, and FIG. 6B is a front view of the slider floating surface.

In FIG. 6, the reason why the negative pressure portion 20 is generated in the concave portion 15 is that the volume of the air rapidly increases in the concave portion 15. Therefore, the fine dust 16 moving along the flow of the air is collected in the concave portion 15 and then flows near the outflow end. At this time, the minute dust 16 does not adhere to the recording / reproducing element 1b because the vicinity of the outflow end of the air streamline indicated by two arrows in the drawing is separated from the recording / reproducing element 1b.

Further, even if large dust which does not move even by the air flow or dust having a size equivalent to, for example, the flying height of the outflow end enters, the pad 14 installed in front of the outflow pad 13 in the air inflow direction. Captures dust and does not directly attach the dust to the recording / reproducing element. Therefore, according to the magnetic head slider of the first embodiment, a stable flying attitude can be maintained at a low flying height.

FIG. 7 shows the flying surface of the magnetic head slider according to the second embodiment of the present invention. The slider 1 is a negative pressure utilizing slider in which a negative pressure portion 20 is generated in two concave portions 15 surrounded by an inflow pad 11 on both sides and a pad 14 at a central portion, and a side rail 12.

Minute dust moving along the flow of air,
The stepped surface 24 of the inflow portion is designed to prevent dust, which does not move along the flow of air, and has the same size as the floating amount at the outflow end from adhering to the pad 14 even when approaching the pad 14. I lost it.

Therefore, the magnetic head slider according to the second embodiment prevents the fine dust moving along the flow of air from approaching the recording / reproducing element, and does not move along the flow of air. Even if dust of the same size enters, the dust can be prevented from adhering to the step surface of the inflow section and the direct read / write element, preventing head crash which damages the media surface even at low flying height. it can.

FIG. 8 shows the flying surface of a magnetic head slider according to Embodiment 3 of the present invention. The slider 1 has an inflow pad 1
1 and 2 surrounded by pads 14 and side rails 12
A negative pressure utilizing type slider in which a negative pressure portion 20 is generated in one concave portion 15.

Minute dust moving along the flow of air,
Also, the contact surface of the pad 14 is formed with an acute angle portion so that dust having the same size as the floating amount at the outflow end that does not move along with the flow of air will not easily adhere to the step surface 24 even when approaching the pad 14. Has a triangular shape oriented in the inflow direction.

The pad 14 of the slider of the third embodiment is
Since the magnetic head slider according to the third embodiment has an air bearing surface, the same effect as the magnetic head slider according to the second embodiment can be obtained, and the flying characteristics of the pad 14 can be improved as compared with the magnetic head slider according to the second embodiment. The adverse effects are small.

FIG. 9 shows the flying surface of the magnetic head slider according to the fourth embodiment of the present invention. The slider 1 has an inflow pad 1
1 and 2 surrounded by pads 14 and side rails 12
A negative pressure utilizing type slider in which a negative pressure portion 20 is generated in one concave portion 15.

The pad 14 of the slider of the fourth embodiment is provided on the outflow pad side as compared with the first embodiment. further,
The step depth of the dust capturing pad 14 of the fourth embodiment is:
The depth is set to be larger than the step depth of the dust capturing pad 14 of the first embodiment.

The effect of the magnetic head slider of the fourth embodiment will be described with reference to FIG. FIG. 7A is a side view of the magnetic head slider according to the first embodiment, and FIG.

Assuming that the flying height h0 at the outflow end and the flying height h1 at the inflow end are constant, when the dust approaches the slider 1 from the air inflow direction, the step depth δs1 of the dust capturing pad 14 in the fourth embodiment is equal to the step depth δs1 in the fourth embodiment. It is larger than the step depth δs of the dust capturing pad 14 of FIG.

For this purpose, the slider 1 and the magnetic recording medium 3
The height hs of the dust entrance between them is smaller in the magnetic head slider of the fourth embodiment than in the magnetic head slider of the first embodiment.
The effect of preventing dust from adhering to the recording / reproducing element is greater than that of the magnetic head slider of the first embodiment.

FIG. 11 shows the flying surface of a magnetic head slider according to Embodiment 5 of the present invention. The slider 1 is a negative pressure type slider in which a negative pressure portion 20 is generated in two concave portions 15 surrounded by the inflow pads 11 and the pads 14 and the side rails 12.

By a seek operation for positioning the magnetic recording medium at an arbitrary radial position, the air inflow direction has a yaw angle with respect to the center line 9 of the slider 1 as shown in FIG.

By making the width W14 of the pad 14 of the slider 1 of the fifth embodiment larger than the width W13 of the outflow pad 13, when air flows in at the maximum yaw angle Yg, it moves along the flow of air. The fine dust 16 preferentially collects in the recess 15 and flows near the outflow end. However, since the vicinity of the outflow end of the streamline is separated from the recording / reproducing element 1b, minute dust does not adhere to the recording / reproducing element 1b.

Further, even if a dust cup having the same size as the floating height at the outflow end that does not move along the flow of air enters,
In front of the outflow pad 13 in the air inflow direction, a pad 14 that can be an air bearing surface captures dust and does not directly attach the dust to the recording / reproducing element. Therefore, the magnetic head slider according to the fifth embodiment can maintain a stable negative image attitude at a low flying height even in a seek operation.

FIG. 12 shows the flying surface of a magnetic head slider according to Embodiment 6 of the present invention. The slider 1 is a negative pressure utilizing slider in which a negative pressure portion 20 is generated in two concave portions 15 surrounded by the inflow pads 11 and the pads 14 and the side rails 12. By making the width W14 of the pad 14 larger than the width W13 of the outflow pad 13 and forming a V-shape, a negative pressure portion 20 is generated in the recess 15.

Therefore, the magnetic head slider according to the sixth embodiment has the same effect as the magnetic head slider according to the fifth embodiment, and generates a larger negative pressure. A decrease in the flying height due to the change can be reduced.

FIGS. 13A and 13B are a three-dimensional view and a front view, respectively, of a magnetic head slider according to Embodiment 7 of the present invention. The slider 1 is a negative pressure type slider in which a negative pressure portion 20 is generated in two concave portions 15 surrounded by the inflow pads 11 and the pads 14 and the side rails 12.

By making the width W 14 of the pad 14 larger than the width W 13 of the outflow pad 13 and forming a V-shape, a negative pressure portion 20 is generated in the recess 15. Further, the inflow pad 11 is formed at an angle with respect to the center line 9 of the slider 1 and the width W of the pair of inflow pad 11 and pad 14 is set.
11 is smaller than the slider width W.

As a result, the fine dust 16 moving along the flow of air and the dust having the same size as the floating amount at the outflow end that does not move along the flow of air enter from the entire floating surface of the slider 1. Even if it is eliminated and penetrated without being adhered, it is hard to adhere.

Therefore, the magnetic head slider according to the seventh embodiment has the same effect as the magnetic head slider according to the sixth embodiment, and has more dust adhesion to the inflow pad and the recording / reproducing element than the magnetic head slider according to the sixth embodiment. The effect that can prevent is large.

FIG. 14 shows the flying surface of a magnetic head slider according to Embodiment 8 of the present invention. The pad 14 is a negative pressure utilizing slider in which a negative pressure portion 20 is generated in two concave portions 15. The plane 40 of the connecting portion between the inflow pad 11 and the pad 14 is flush with the recess surface 25.

By doing so, the fine dust 16 moving along the flow of air, and particularly the dust having the same size as the floating amount at the outflow end that does not move along the flow of air, are completely lifted by the slider 1. It is eliminated without invading from the surface, and even if invading, it is hard to adhere.

Therefore, the magnetic head slider according to the eighth embodiment has the same effect as the magnetic head slider according to the seventh embodiment, and has more dust adhesion to the inflow pad and the recording / reproducing element than the magnetic head slider according to the seventh embodiment. The effect that can prevent is large.

FIG. 15 shows the flying surface of a magnetic head slider according to Embodiment 9 of the present invention. The slider 1 is a negative pressure utilizing slider in which a negative pressure portion 20 is generated in two concave portions 15 surrounded by the inflow pads 11 and the pads 14 and the side rails 12. At least one elongated groove 41 parallel to the air inflow direction is provided in the center of the pad 14.

By providing the groove 41, the damping coefficient of the air film can be increased. Therefore, the magnetic head slider according to the ninth embodiment has the same effect as the magnetic head slider according to the fifth embodiment, and has a lower damping of the slider vibration when coming into contact with the magnetic recording medium than the magnetic head slider according to the sixth embodiment. And the fluctuation of the flying height can be reduced.

The material of the slider 1 was a ceramic material such as alumina titanium carbide, similarly to the conventionally used material. Further, by adhering a material having a small surface energy, such as fluorine, to the surface of the pad 14, dust is less likely to adhere to the pad 14, and the effect of the magnetic head slider according to the first to ninth embodiments of the present invention is further enhanced. Become.

FIG. 16 shows an embodiment of the magnetic disk drive according to the present invention. FIGS. 3A and 3B are a plan view and a side view, respectively, showing a state in which the slider 1 is running and performing a seek operation while flying above the surface 3 of the magnetic recording medium.

The magnetic disk device 50 has a magnetic recording medium 3
And a drive unit 51 for rotating the slider, the magnetic head slider 1 of the above embodiment of the present invention, its support 2, a support arm 52 for positioning and a drive unit 53 thereof, and recording of a magnetic head mounted on the slider 1. It is composed of a circuit 54 for processing a reproduced signal.

With this configuration, since a stable flying posture can be maintained at a low flying height, a smooth medium can be used for the magnetic recording medium 3. As for the surface roughness of the smoothing medium to be used, the center line average surface roughness Ra needs to be 1 nm or less, and the center line maximum height Rp needs to be 5 nm or less.

[0071]

According to the present invention, variations in flying height and fluctuations in flying height are reduced, the flying characteristics satisfying a constant flying profile are satisfied, and minute dust moving along the flow of air is transferred to the recording / reproducing element. Even if dust of the same size as the flying height of the outflow end that does not move along with the flow of air enters, dust can be prevented from directly adhering to the recording / reproducing element.

Therefore, even at a low flying height, it is possible to prevent a head crash in which the medium surface is damaged, to increase the recording density,
It is possible to provide a magnetic head slider and a magnetic disk device that are excellent in reliability.

[Brief description of the drawings]

FIG. 1 is a diagram showing a flying surface of a magnetic head slider according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an inflow pad and a side rail according to the first embodiment of the present invention.

FIG. 3 is a view showing an outflow pad according to the first embodiment of the present invention.

FIG. 4 is a view showing a dust capturing pad according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a pressure distribution on a slider flying surface according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating the effect of the first embodiment of the present invention.

FIG. 7 is a view showing a floating surface of a magnetic head slider according to a second embodiment of the present invention.

FIG. 8 is a view showing a floating surface of a magnetic head slider according to a third embodiment of the present invention.

FIG. 9 is a diagram illustrating a flying surface of a magnetic head slider according to a fourth embodiment of the present invention.

FIG. 10 is a diagram illustrating an effect of the fourth embodiment of the present invention.

FIG. 11 is a view showing a floating surface of a magnetic head slider according to a fifth embodiment of the present invention.

FIG. 12 is a diagram showing a floating surface of a magnetic head slider according to a sixth embodiment of the present invention.

FIG. 13 is a view showing a floating surface of a magnetic head slider according to a seventh embodiment of the present invention.

FIG. 14 is a view showing a floating surface of a magnetic head slider according to an eighth embodiment of the present invention.

FIG. 15 is a diagram showing a flying surface of a magnetic head slider according to a ninth embodiment of the present invention.

FIG. 16 is a diagram showing an embodiment of a magnetic disk drive according to the present invention.

FIG. 17 is a view showing a floating surface of a conventional magnetic head slider.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic head slider 1b Recording / reproducing element 1c Magnetic head 1d Connection terminal 11 Inflow pad 12 Side rail 13 Outflow pad 14 Pad 15 Negative pressure generating concave part 16 Fine dust moving along air flow 20 Negative pressure part 21 Contact Surface 22, 23 Step portion 24 Step surface 25 Recess surface 30 Conventional magnetic head slider 31 Side rail 32 Cross rail 33 Center pad 34 Inclined surface provided on cross rail 32 35 Step surface provided on cross rail 32 36 Cross rail center 37, a semicircular concave dust protection wall 40, a flat surface of a connecting portion between the inflow pad 11 and the pad 14, a groove δs, a step depth δr, a recess depth hs, a slider 1 and a magnetic recording medium 3. Dust entrance height between h0 Width Yg maximum yaw angle of the Extension end flying height h1 inflow end floating amount δs1 width W13 trailing pad 13 in step depth W14 pad 14 of the dust capturing pad 14 embodiment 4

Claims (8)

[Claims] 1. A magnetic device comprising: a center pad having an air bearing surface formed on a slider floating surface in front of an air inflow side of a recording / reproducing element; and negative pressure portions formed on both sides of the center pad. Head slider. 2. A recording / reproducing element provided on an air outflow end side of a slider center axis, a central pad having an air bearing surface disposed on a slider floating surface in front of the recording / reproducing element on an air inflow side, A magnetic comprising: two side pads having air bearing surfaces formed on both sides of the center pad; and two negative pressure portions formed between the center pad and the both side pads, respectively. Head slider. 3. A two-sided pad having a pair of air bearing surfaces provided on an air inflow side of a slider floating surface, a side rail formed along both outer sides of the slider floating surface, and the slider floating. In a magnetic head slider of a negative pressure utilizing type in which a negative pressure is generated in a concave portion surrounded by a pad having an air bearing surface on which a recording / reproducing element is mounted, And a central pad having an air bearing surface in front of the pad on which the recording / reproducing element is mounted in the air inflow direction, and that two negative pressure portions are generated in the recess when air flows in. Characteristic magnetic head slider. 4. The magnetic head slider according to claim 1, wherein the central pad has a triangular shape having an acute angle in an air inflow direction. 5. The magnetic head slider according to claim 1, wherein the central pad is:
A magnetic head slider having an elongated groove in an air inflow direction of an air bearing surface. 6. The magnetic head slider according to claim 1, wherein the central pad is:
A magnetic head slider characterized in that a material having low surface energy is adhered to the surface. 7. A magnetic disk drive comprising the magnetic head slider according to claim 1. 8. The magnetic disk drive according to claim 7, wherein the magnetic recording medium facing the magnetic head slider has a center line average surface roughness Ra of 1 nm or less and a center line maximum height Rp of 5 nm or less. A magnetic disk drive characterized by the above-mentioned.