JP2001351215A - Slider for disk recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas and liquid mixed lubricant pseudo-contact slider, having a stable low floating amount using a negative liquid motive pressure generated according to the shape of a contact pad provided in the slider, and suppressing the generation of an excessive lubricant film pressure, as for the head medium interface of the pseudo contact system of the slider and a recording medium. SOLUTION: A pad is provided, to be brought into contact with a lubricant film, and liquid-bearing effect is generated between the contact surface of the pad and the recording medium with the lubricant interposed in-between. The contact surface of the pad is set to be a slope or a discontinuous step surface, where a distance from the medium is increased from the inlet end to the outlet end of the slider. Alternatively, the contact surface is formed to be U-shaped having depth in the center and rear parts, in the reverse direction of the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a slider used for a storage device such as a hard disk device.

[0002]

2. Description of the Related Art Conventionally, a hard disk drive (HDD)
Is equipped with a head for recording and reproducing data on both sides of a disk as a recording medium. In the HDD, the head is mounted on a support made of a ceramic material or the like called a slider, and is supported on the data recording surface of the disk in a state of floating at a predetermined interval.

[0003] Disks are made of various materials such as metal, resin and glass. On resin disks such as those used for CDs, lasers store and retrieve data. On metal disks, data is stored and retrieved by electromagnets commonly known as transformers.

In order to store data on a magnetic disk, the surface of the disk is magnetized using a small ceramic block generally called a slider. The slider incorporates a magnetic transducer, which is a so-called write head. More specifically, the slider containing the write head floats at a height of several hundred NM to several tens of NM from the disk surface, and the head is excited into several states, and the tracks located thereunder correspond to data. Magnetize so that

In order to retrieve data stored on a magnetic disk, a slider containing a read head is floated on the disk. At this time, a current is induced in the read head by the magnetized portion on the track. By analyzing the current output from the read head, the computer system can reproduce and use the data stored on the magnetic disk. Some h
While DD uses separate read and write heads, most modern HDDs use a transducer that performs both read and write operations. Recently, a magnetoresistive element or an inductance element has been used as a read head.

There are two types of HDDs having a rotary actuator and a linear actuator. The rotary actuator has an actuator arm similar to the tone arm of a record player. Like a tone arm, its actuator arm rotates so that a slider containing a read / write head can move to positions above various tracks on the disk. In this way, the read / write head can be used to magnetize the tracks on the surface of the disk in a pattern corresponding to the data and to detect the magnetized pattern on the tracks. For example, if the required data is stored on two different tracks of a disk, the actuator arm may move from one track to the other to read what is magnetically representative of the data. Rotate to. The present invention relates to a rotary actuator HDD.

[0007] Linear actuators also have a similar actuator arm, but the movement of position is performed by linear movement rather than rotation.

[0008] The actuator arm of the HDD has a slider attached to its tip, and has a built-in read / write head therein. A pad is fixed to the slider. As the disk rotates, air is drawn between the pad and the disk surface, thereby applying pressure to keep the head away from the disk. The head then floats on the rotating disk as described above. The flying height is the thickness of the air lubrication film, that is, the distance between the disk surface and the head.

Thus, the pad forms an air bearing surface (ABS) and forms and maintains a self-pressurizing air lubrication film between the head and the disk storage surface. This film eliminates friction and wear that occurs when the head and the disk come into mechanical contact during disk rotation.

The ABS design basically consists of two pads in a tapered shape, known as a tapered flat slider. The two-pad tapered flat configuration typically has two or more flat pads, each with a tapered tip. The pads are extended with a tapered tip oriented in the direction of rotation of the disk surface. This design works well for linear actuator HDDs, since the air between the disk and the slider basically flows in one direction along the length of the pad. Stated another way, such a design requires that the slider be positioned relative to the disk such that viscously drawn air under the slider flows from the front of the slider to the rear along a longitudinal axis parallel to the pad. Can be said to work well. The concept of the taper flat design is that the access speed is relatively slow using a linear actuator,
Dating back to the days of large diameter files.

[0011] Today's HDDs are significantly different from large diameter HDDs using linear actuators.
Current files are very small and data access is fast. Currently, HDDs are 5.25 ",
It is equipped with a rotary actuator for processing disks of 3.50 ", 2.50", 1.80 "diameter and obtaining a high access speed. Mainly by using the rotary actuator, The airflow under the slider is no longer inherently unidirectional, but spreads out at various angles with respect to the slider's longitudinal axis. Therefore, in recent rotary actuators / HDDs, the airflow is no longer considered to move from the front to the rear of the slider or slightly deviate therefrom.

The angle of the airflow relative to the longitudinal axis of the slider is called the skew angle. The tilt angle is positive when the actuator arm is positioned so that airflow hits the outer edge or outside of the slider. Actuator so that it touches the inner end of the slider or the hub
When the arm is located, the skew angle is negative.
The tapered flat design results in extreme drop in floating altitude at high positive or negative skew angles and fast access speeds because the slider is designed for linear actuators rather than rotary actuators. Cheap.

Also, due to the twist of the airflow, the flying height is not constant under all pads due to the rotation of the slider. Turning the slider is analogous to tilting the aircraft as the plane changes direction. That is,
It is a movement that raises one wing and lowers the other wing.
In the HDD, a positive rotation occurs when the outer pad moves away from the disk surface, and a negative rotation occurs when the outer pad approaches the disk surface.

In the HDD, the flying height of the slider is an important parameter that needs to be controlled. As the floating altitude increases, the signal amplitude decreases and the signal-to-noise ratio decreases, thus increasing the error rate. When the flying height decreases, the possibility that the head comes into contact with the disk surface increases, and if it does, the wear of both the head and the disk surface increases, the reliability decreases, and the HDD may be damaged. Extreme contact with the disk surface that could cause a failure is called a crash, and the data becomes unplayable.

Controlling the rotation of the slider is also important.
When the end portion of the slider is lowered by rotation, the possibility that the head comes into contact with the disk surface increases. When rotation occurs to lift one end of the slider, the distance of the read / write head from the disk surface increases,
As the floating altitude becomes higher, it causes a data error as well as a data error. The adverse effects of such rotation are exacerbated when the read / write head is mounted on its raised end.

With the recent increase in the recording density of HDDs,
It is required that the flying height of the slider be minimized, that the slider be in contact with the lubricating film, and that the slider be in pseudo contact with the disk.

Conventionally, Japanese Patent Application Laid-Open No. 5-54578 discloses a method in which a lubricating layer made of a liquid lubricant is provided on the outermost surface of a magnetic recording medium, and a magnetic head slider is brought into contact with the liquid lubricant layer at high speed to slide. By balancing the attractive force due to the surface tension of the lubricant with the repulsive force due to the pressure of the liquid lubricant, the solid surface of the medium under the liquid lubricant layer does not come into contact with the magnetic head slider, and the mean free path of air, 0 0.064 μm
This is achieved by keeping the following close distances.

Japanese Patent Application Laid-Open No. H10-3628 discloses that a jump of a magnetic head slider is effectively suppressed by controlling a meniscus attractive force acting between a magnetic disk medium and a magnetic head slider. Provided is a contact-type magnetic disk device which prevents wear and damage of a medium and increases the durability of the entire device. It is effective only for vibration such as jumping.

[0019]

Since the liquid lubricating film has a viscosity 1000 times higher than the viscosity of air, the relative lubricating speed between the slider and the recording medium and the high viscosity on the contact surface of the contact pad provided on the slider are large. A fluid dynamic pressure several thousand times higher than the atmospheric pressure is generated. Due to the high pressure, the slider separates from the disk, and there is a problem that a stable minimum clearance is not guaranteed. Further, when a high data transfer rate of the HDD is required, the rotation speed of the recording medium is increased, and the relative speed between the slider and the recording medium is increased, the meniscus phenomenon of the liquid is less likely to occur. Flying height control becomes difficult.

An object of the present invention is to provide a pseudo-contact type head medium interface between a slider and a recording medium,
An object of the present invention is to provide a pseudo contact slider of gas-liquid mixed lubrication with a low flying height that suppresses the generation of excessive lubricating film pressure by the shape of a contact pad provided on the slider.

[0021]

SUMMARY OF THE INVENTION A slider of a disk recording / reproducing apparatus according to the present invention is a slider on which a head for recording or reproducing a signal on or from a recording medium is mounted. Wherein the slider has an air bearing surface facing the recording medium, the air bearing surface has one or more pads, and the pads have a contact surface that comes into contact with the liquid lubricant. A positive pressure is generated between the liquid lubricant and the air bearing surface due to the relative movement between the liquid lubricant and the air bearing surface, the positive pressure acting to move the slider away from the recording medium. The surface is formed such that a negative pressure is generated which acts to relieve said positive pressure, thereby achieving said object.

The contact surface may have a recess formed so that the negative pressure acts on the contact surface.

The slider has an inflow end formed on an inflow side of an air flow generated by the rotation of the recording medium, and an outflow end formed on an outflow side of the air flow. It may be formed on the outflow end side.

[0024] The head may be arranged at a center of the outflow end.

The floating surface may have a first floating surface formed on the inflow end side and a second floating surface formed on the outflow end side.

The pad may be formed on the second floating surface.

[0027] The contact surface may include an inclined surface, and the inclined surface may be formed such that a distance between the inclined surface and the recording medium increases from the inflow end to the outflow end. .

The slider has an inflow end formed on an inflow side of an air flow generated by the rotation of the recording medium, and an outflow end formed on an outflow side of the air flow. It has a first contact surface formed on the inflow end side and a second contact surface formed on the outflow end side, wherein the second contact surface acts to relieve the positive pressure. Pressure may be generated.

[0029] The distance between the second contact surface and the recording medium may be greater than the distance between the first contact surface and the recording medium.

[0030] A step may be formed between the first contact surface and the second contact surface.

According to one aspect of the present invention, a head for recording or reproducing a signal with a recording medium having a liquid lubricant on its surface, and a slider having the head mounted thereon and having a flying surface facing the recording medium And having one or more pads, wherein the at least one pad is in contact with a lubricant applied on the recording medium. Most of the slider is levitated by an air bearing as in the prior art. However, in order to maintain a low flying height and a stable flying height, a pad that contacts at least one liquid lubricating film is provided on the lubrication surface of the slider. By utilizing the negative liquid dynamic pressure generated by the shape of the pad, an effect of maintaining an extremely low flying height of the slider is obtained.

According to another aspect of the present invention, there is provided a head for recording or reproducing a signal with a recording medium having a liquid lubricant on its surface, and a flying surface on which the head is mounted and which faces the recording medium. A slider comprising one or more pads, wherein at least one pad is in contact with a lubricant applied on a recording medium. The negative liquid dynamic pressure generated by the shape of the pad is used. As shown in FIG. 1A, the absolute value of the negative dynamic pressure increases as the gap increases in the flow direction (as Δh increases).
It increases until it is saturated at 1. Since the viscosity of the liquid is larger than the viscosity of the air, the negative pressure 102 of the liquid lubricating film is more likely to be saturated than the negative pressure 103 of the air film.

According to still another aspect of the present invention, a head for recording or reproducing a signal with a recording medium having a liquid lubricant on a surface thereof, and a flying surface on which the head is mounted and which faces the recording medium are provided. A slider having a first air bearing surface on which the head is mounted, and a height extending from the air bearing surface at the first height in the direction of the recording medium, so that the recording / reproducing head does not come into contact with the recording medium. This has the effect of suppressing the effect of the heat generated by the destruction or contact of the head on the signal of the head (thermal asperity phenomenon).

According to still another aspect of the present invention, a head for recording or reproducing a signal with a recording medium having a liquid lubricant on a surface thereof, and a flying surface on which the head is mounted and which faces the recording medium are provided. A slider having at least one pad, and a negative liquid dynamic pressure generated by the viscosity of the liquid lubricant and the shape of the pad in contact with at least one pad and a lubricant applied on a recording medium. Use The negative liquid dynamic pressure is the same as the positive pressure generated from the liquid film,
The flying height of the slider is determined in balance with the air pressure and load of the air bearing. As shown in FIG. 1A, the smaller the gap h is, the larger the positive liquid dynamic pressure is. For a negative liquid dynamic pressure, the absolute value of the atmospheric pressure may saturate with respect to the difference Δh in the gap expanding in the flow direction. Therefore, it is difficult for the gap to be smaller than the lubricating film due to the action of the positive pressure. Generally, the gap corresponds to the thickness of the lubricating film. In addition, according to Equation 1 described later, the liquid dynamic pressure has a direct proportional relationship with the viscosity. Therefore, when the viscosity is high, the positive pressure is high, so that it is difficult to realize a low flying height. According to the present invention, the thickness of the liquid lubricant interposed between the contact pad and the recording medium is set to 20 nm or less and the viscosity thereof is set to 0.1 PaS or less to obtain an effect of maintaining an extremely low flying height of the slider.

According to still another aspect of the present invention, the contact surface of the pad in contact with the lubricating film is an inclined surface or a discontinuous step surface in which the distance from the medium increases from the air inflow end to the outflow end of the slider. The shape of the contact surface is the shape of a C character having a depth in the opposite direction of the recording medium at the center and the rear. When the pad comes into contact with the lubricating film, a lubricant is interposed between the contact surface of the pad and the recording medium, and a liquid bearing effect occurs. Since the viscosity of the lubricant is 1000 times or more that of air, the generated pressure is considerably large, and the flying height of the slider tends to be large. For this reason, on the contact surface of the contact pad, an inclined plane, a step surface, or a C-shaped surface is provided such that the inflow end is higher in the recording medium direction than the outflow end and a diffusion space for the liquid lubricant is formed. This has the effect of reducing the generated positive pressure or generating a negative pressure.

[0036]

Embodiments of the present invention will be described below.

Embodiment 1 FIG. 2 is a perspective view of the inside of the HDD 100. FIG. 3 is a sectional view of the HDD.
The HDD is covered by a housing cover (not shown). A suspension 14 is mounted at the tip of each of the actuator arm sets 5 rotatably mounted on the actuator shaft 20. At the tip of each suspension 14 is attached a slider 3 which carries a magnetic transducer or a read / write head 99 (not shown in FIG. 2).

The main shaft 1 is mounted in the housing 7. A large number of disks 2 are rotatably mounted on the main shaft 1 at intervals. Disk 2 is a motor 8
The main shaft 1 rotates in the direction indicated by the arrow A together with the main shaft 1. Information is written on or read from disk 2 by a head 99 (not shown) located in slider 3 and positioned by actuator arm set 5.

The sliders 3 are provided on both the front and back surfaces of the disks 2, and information is written on or read from the front and back surfaces of each disk 2. Power is supplied to the actuator set 5 by the voice coil motor 6 and the actuator arm 5
Swings around the actuator shaft 20.

The slider 3 and its integrated magnetic transducer (not shown) move over the surface of the disk 2 so that a magnetic representation of the data can be stored on any track on the disk 2. In the HDD, the movement of this transducer is due to rotation about the actuator axis 20. By rotating the actuator / actuator arm 5, the slider 3 and the transducer therein can be positioned on any track on the surface of the disk 2.

FIG. 4 is a detailed view of one of the disks 2 as viewed from above. As is well known in the HDD technology, each disk has a row of concentric tracks on which magnetic information is recorded. Inner diameter (ID) 11
Is the innermost concentric track where data is stored. Outer diameter (OD) 10 is the outermost concentric track where data is stored.

FIGS. 5A and 5B show the shape of the air bearing surface (ABS) of the slider 3. ABS,
It is fixed to the lower surface of the slider 3 and faces the disk surface. The shape of the ABS is formed by molding, etching, laser cutting, ion pulverizing, general-purpose machining, or various other methods.

The slider 3 has an inflow end 21 and an outflow end 2
2. There are an inner peripheral end 23 and an outer peripheral end 24. As shown in FIG. 5, the slider 3 is provided with an inflow end floating surface 30 and an outflow end floating surface 31 which are the first height floating surfaces. Further, a contact pad 32 having a height higher than the flying surface 31 is provided. As shown in FIG. 5B, the pad 32 is provided with a recess 40 lower than the contact surface 33 of the pad 32. The recording transducer or the read / write head 99 is located at the rear end of the outflow end floating surface 31.

An operation (referred to as a steady state) in which the slider records and reproduces a signal between the disk and the slider according to the present configuration will be described.

As shown in FIGS. 6A and 6B, the inflow end 21 is oriented in the direction in which the disk surface rotates. Due to the viscous effect, the rotating disk 2 forces the air 104 to pass under the inflow end 21 and into the inflow end floating surface 30, thereby creating a pressure below the floating surfaces 30, 31 in the opposite direction to the disk. As a result, an air lubricating film is formed. Here, the pressure acting in the direction in which the slider 3 flies from the disk is called positive pressure, and the pressure pulling the slider 3 toward the disk is called negative pressure. Since the slider 3 is floating at a low flying height, the contact pad 32 comes into contact with the lubricating film applied to the surface of the disk 2. This contact causes the liquid lubricant of the lubricating film to pass under the contact pad 32 and into the contact surface 33, thereby creating a pressure below the contact surface 33 in a direction opposite to the disk 2. As a result, a liquid lubricating film is formed.

Here, the relationship among the viscosity, the gap, and the relative speed is shown in Equation 1. P: pressure, μ: viscosity, U: relative speed, h: gap According to the equation (1), as the viscosity and the relative speed increase,
The pressure increases. The pressure at the inflow end of the gap is the atmospheric pressure P
0, and the gap is h0. When the gap (thickness at the location within the gap is h1 and the pressure is P1) is h0> h1 when narrowing in the flow direction, P0 is obtained by the equation (1).
<P1. Since P1−P0> 0, a positive pressure is generated in the gap. Conversely, when the gap expands in the flow direction, h0 <h1, so that P0> P1, that is, P0
Since 1-P0 <0, a negative pressure is generated in the gap.

Here, the intensity of the generated pressure is directly proportional to the rotation speed of the disk, the reciprocal of the height of the gap through which the flow passes, and the viscosity of the passing fluid. The viscosity of the liquid is 1000 times that of air, and the gap in the contact pad 32 corresponds to the thickness of the lubricating film. FIG. 6B shows a cross-sectional view and a pressure distribution diagram of the slider. As shown by an arrow 61 in FIG. 6B, a pressure greater than the air bearing surfaces 30, 31 is generated on the contact surface 33 of the contact pad. This large pressure increases the flying height of the slider and affects the flying attitude of the slider. In this configuration, since the recess 40 is provided in the contact surface 33 of the contact pad 32, the gap under the contact surface suddenly increases from the center of the pad, so that a negative pressure indicated by an arrow 62 is generated in the contact surface 33. . The negative pressure 62 has an action of relieving the excessive positive pressure 61 on the contact surface 33. Furthermore, a rotational moment acts on these two forces. Further, due to the viscosity of the lubricant, a shear force acts on the slider, and a moment in the opposite direction acts. The slider balances these forces to ensure a constant flying height.

(Embodiment 2) In Embodiment 2, the same description as in Embodiment 1 is omitted.

The slider 3 has an inflow end 21 and an outflow end 2
2. There are an inner peripheral end 23 and an outer peripheral end 24. As shown in FIG. 5, the slider 3 is provided with an inflow end floating surface 30 and an outflow end floating surface 31 which are the first height floating surfaces. As shown in FIG. 7A, a contact pad 32A having a height higher than the air bearing surface is provided. The contact pad 32A has a pad inflow end 34 and a pad outflow end 35. Contact surface 33A
Is an inclined surface whose distance from the medium increases from the pad inflow end 34 to the pad outflow end 35. In this configuration, the inclined surface is provided on the contact surface 33A of the contact pad 32A, so that a gap below the contact surface expands in the flow direction, so that a negative pressure 71 is generated on the contact surface 33A. The negative pressure 71 has an action to relieve the excessive positive pressure 72 on the contact surface 33A. The pressure distribution diagram is shown in FIG.

(Embodiment 3) In Embodiment 3, the same description as in Embodiment 1 is omitted.

The slider 3 has an inflow end 21 and an outflow end 2
2. There are an inner peripheral end 23 and an outer peripheral end 24. As shown in FIG. 5, the slider 3 is provided with an inflow end floating surface 30 and an outflow end floating surface 31 which are the first height floating surfaces. As shown in FIG. 8A, a contact pad 32B having a height higher than the air bearing surface is provided. As shown in FIG.
Pad inflow end 34, pad outflow end 3
There are five. The contact surface 33B is a step surface which is divided into a front half portion 33C and a rear half portion 33D, and the front half portion 33C extends in the direction of the disk 2 from the rear half portion 33D. In this configuration, since the step surface is provided on the contact surface 33B of the contact pad 32B, the gap below the contact surface is enlarged, and thus a negative pressure 81 is generated in the rear half of the contact surface 33B. The negative pressure 81 acts to relieve the excessive positive pressure 82 on the contact surface 33B. The pressure distribution diagram is shown in FIG.

The negative pressure depends on the relative speed between the liquid lubricant and the slider, as shown in the equation (1), and is inversely proportional to the gap. A negative pressure peak shown in FIG. 8B occurs.

(Embodiment 4) In Embodiment 4, the same description as in Embodiment 1 is omitted.

The slider 3 has an inflow end 21 and an outflow end 2
2. There are an inner peripheral end 23 and an outer peripheral end 24. As shown in FIG. 9, the slider 3 is provided with an inflow end floating surface 30, which is a first height floating surface, and an outflow end floating surface 31 on which a recording converter or a read / write head 99 is mounted. .
In addition, the contact pads 32 having a higher height from the air bearing surfaces 30 and 31 are provided.
Is provided. In this configuration, when the contact pad 32 comes into contact with the recording medium, the recording transducer or the read / write head 9 is used to avoid contact between the head and the recording medium.
9 is not destroyed and the thermal asparity phenomenon does not occur.

[0055]

As described above, according to the present invention, the occurrence of excessive lubricating film pressure is suppressed by the shape of the contact pad provided on the slider in the head medium interface of the pseudo contact system between the slider and the recording medium. In addition, it is possible to provide a pseudo-contact slider with stable gas / liquid mixed lubrication with a low flying height.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a gap and a fluid dynamic pressure.

FIG. 2 is a perspective view of an HDD.

FIG. 3 is a sectional view of the HDD.

FIG. 4 is a detailed view of one of the disks 2 as viewed from above.

FIG. 5 is a diagram showing a shape of an air bearing surface (ABS) of the slider 3 according to the first embodiment.

FIG. 6 is a sectional view, a contact pad, and a pressure distribution diagram of the slider according to the first embodiment.

FIG. 7 is a diagram showing a contact pad (a) and a pressure distribution (b) of the slider according to the second embodiment.

FIG. 8 is a diagram showing a contact pad (a) and a pressure distribution (b) of the slider according to the third embodiment.

FIG. 9 is a relationship diagram between a slider and a recording medium according to a fourth embodiment.

[Explanation of symbols]

 Reference Signs List 1 spindle 2 disc 3 slider 5 actuator arm set 6 voice coil motor 7 housing 8 motor 14 suspension 20 actuator shaft 99 head 11 inner diameter (ID) 10 outer diameter (OD) 21 inflow end 22 outflow end 23 inner circumference end 24 Outer peripheral end 30 Inflow end floating surface 31 Outflow end floating surface 32 Contact pad 33 Contact surface 34 Pad inflow end 35 Pad outflow end 40 Recess in contact surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kaoru Matsuoka 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Co., Ltd. F-term (reference) 5D042 NA02 PA10 QA02 QA03

Claims (10)

[Claims] 1. A slider on which a head for recording or reproducing a signal on or from a recording medium is mounted, wherein the recording medium has a liquid lubricant on a surface, and the slider has a floating surface facing the recording medium. Wherein the air bearing surface has one or more pads, the pad has a contact surface that comes into contact with the liquid lubricant, and the liquid lubricant and the air bearing surface have The relative movement between the liquid lubricant and the air bearing surface generates a positive pressure acting to move the slider away from the recording medium, and the contact surface acts as a negative pressure acting to relieve the positive pressure. A slider of a disk recording / reproducing device formed to generate pressure. 2. The slider according to claim 1, wherein the contact surface has a recess formed so that the negative pressure acts on the contact surface. 3. The slider has an inflow end formed on an inflow side of an airflow generated by rotation of the recording medium, and an outflow end formed on an outflow side of the airflow. 3. The slider according to claim 2, wherein the slider is formed on the outflow end side. 4. The slider according to claim 3, wherein the head is disposed at a center of the outflow end. 5. The disk recording / reproducing apparatus according to claim 3, wherein the floating surface has a first floating surface formed on the inflow end side and a second floating surface formed on the outflow end side. Slider. 6. The slider of claim 5, wherein the pad is formed on the second floating surface. 7. The contact surface includes an inclined surface, and the inclined surface is formed such that a distance between the inclined surface and the recording medium increases from the inflow end to the outflow end. A slider for a disk recording / reproducing apparatus according to claim 1. 8. The slider according to claim 8, wherein the slider has an inflow end formed on an inflow side of an airflow generated by rotation of the recording medium, and an outflow end formed on an outflow side of the airflow. Has a first contact surface formed on the inflow end side and a second contact surface formed on the outflow end side, and the second contact surface acts to relieve the positive pressure. 2. The slider according to claim 1, wherein the slider is formed so as to generate a negative pressure. 9. The slider according to claim 7, wherein a distance between the second contact surface and the recording medium is larger than a distance between the first contact surface and the recording medium. . 10. The slider of claim 8, wherein a step is formed between the first contact surface and the second contact surface.