JPH11185246A - Discoid storage medium and disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform stable and safe unloading with a simple structure even in the magnetic disk device of a dynamic unloading type, which uses a negative pressure head slider. SOLUTION: Information is recorded/reproduced by magnetic head attached to a negative pressure head slider swung while being floating from a surface by a specified floating amount, and in an unloading area in the vicinity of an outer periphery, which is the unloading area of a discoid storage medium 12 for dynamic loading/unloading of the negative pressure head slider, a groove 12a is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk-shaped recording medium and a disk device used in a large-capacity storage device for an information processing apparatus such as a computer, and more particularly to a disk-shaped recording medium and a disk device for dynamic load / unload. It is about.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk drive built in or connected to a computer or the like is configured as shown in FIG. In the magnetic disk drive 1, a spindle motor (not shown) is disposed on a flat surface of a casing 2 formed of an aluminum alloy or the like, and the magnetic disk is driven to rotate at a constant angular velocity by the spindle motor. 3 are provided.

Further, an arm 4 has a vertical axis 4
It is mounted so as to be swingable around a. A voice coil 5 is attached to one end of the arm 4, and a suspension 4 b made of a leaf spring is attached to the other end of the arm 4.
, The head slider 6 is attached. Magnets 7 a and 7 b are mounted on the housing 2 so as to hold the voice coil 5. The voice coil 5 and the magnets 7a and 7b constitute a voice coil motor 7.

In such a configuration, when a current is supplied to the voice coil 5 from the outside, the arm 4 moves the vertical axis 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 around 4a. 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 as shown by the arrow X in FIG. Therefore, the magnetic head 8 (see FIG. 10) provided in the head slider 6 performs a seek operation on the magnetic disk 3 to record and reproduce information on a predetermined track of the magnetic disk 3.

Here, the head slider 6 is, for example, shown in FIG.
0. That is, the head slider 6 has rails 6a and 6b acting as air lubrication surfaces formed on both sides of a lower surface which is one main surface thereof, and a tapered portion 6 on the air inflow end side of these rails 6a and 6b.
c and 6d are provided. Thus, as shown in FIG. 9, when the head slider 6 approaches the surface of the magnetic disk 3 rotating in the direction of the arrow Y, the rails 6a and 6b of the head slider 6 are magnetically coupled with the rotation of the magnetic disk 3. A buoyancy force, which is a positive pressure, is received by the airflow flowing between the disk 3 and the surface.

The buoyancy and the suspension 4b described above
The head slider 6
As shown in FIG. 11, the magnetic head 8 mounted on the head slider 6 flies and travels at a small interval (floating amount) d from the surface of the magnetic disk 3. Thereby, abrasion damage of the magnetic disk 3 due to the magnetic head 8 directly contacting the surface of the magnetic disk 3 is prevented. The flying height d is about 0.08 μm at present, and is about 0.03 μm at the research level.

[0007] According to the flying head slider 6 configured as described above, as shown in FIG.
Even if there are some irregularities on the surface of the magnetic disk 3, the flying height d of the head slider 6 and the magnetic head 8 from the surface of the magnetic disk 3 on the same track is kept substantially constant.

In the magnetic disk drive 1 having such a configuration, the head slider 6 is in contact with the innermost circumference of the magnetic disk 3 when not activated. Then, when the spindle motor starts up by turning on the power and the magnetic disk 3 starts rotating, the head slider 6 first moves while rubbing the surface of the magnetic disk 3 and then gradually receives the levitation force of the airflow to rub the magnetic disk 3. Start floating from the surface of No.3. Then, when the magnetic disk 3 reaches the constant speed rotation, the head slider 6 reaches a desired flying height d, and stable magnetic recording / reproduction is performed.

At the time of stop, the head slider 6 moves to the innermost circumference of the magnetic disk 3 by a seek operation by the rotation of the arm 4 in response to a stop command from a computer or the like or power off. Then, as the rotation speed of the magnetic disk 3 decreases, the flying height of the head slider 6 decreases, and when the rotation of the magnetic disk 3 stops, the head slider 6 lands on the innermost circumference of the magnetic disk 3.

Such a magnetic disk drive 1 has a CSS
(Contact Start Stop) method. As described above, the flying height d is, for example, 0.08 μm.
Since it is very small, the surface of the magnetic disk 3 and the air-lubricated surface of the head slider 6 are polished so as to be super smooth. For this reason, at the time of non-activation, the air lubrication surface of the head slider 6 comes into contact with the surface of the magnetic disk 3, and in some cases, suction may occur.

Therefore, when such suction occurs, the magnetic disk 3 does not rotate due to the suction even if it is started, and in the worst case, the head slider 6 falls off the suspension 4b of the arm 4, and There has been a problem that the disk device 1 may fail or the surface of the magnetic disk 3 may be damaged, resulting in loss of recorded data.

On the other hand, conventionally, the flying height d is 0.1 μm.
In the magnetic disk drive 1 having a length of m or more, the entire surface of the magnetic disk 3 is processed with fine scratches (projections), that is, textures, by texturing. Is limited to the flying height d or less. Therefore, there is no problem when the flying height d is large, but there is a problem that it is impossible to cope with recent low flying height.

For this reason, at present, as shown in FIG. 12, the data area of the magnetic disk 3 is left as an ultra-smooth surface, and only the innermost CSS area is provided as shown in FIGS. So-called zone texturing, which processes a simple texture 3a, is widely used. However, performing texturing only on such a predetermined area requires a device in machining, which is troublesome, which increases the cost, and also causes the head slider to shift between the CSS zone and the data zone. At times, there has been a problem that the flying of the head slider becomes unstable.

Further, the CSS system itself has the following problems. That is, friction occurs due to the contact between the head slider 6 and the magnetic disk 3, and wear due to the friction is inevitable. Therefore, abrasion powder is generated, and the abrasion powder is generated in the sealed magnetic disk device 1. Accumulate in For this reason, abrasion powder penetrates between the air-lubricated surface of the head slider 6 and the surface of the magnetic disk 3 to cause the head slider 6 to float, and in some cases, the magnetic disk of the head slider 6 in the data area. There is a problem that a crash may occur to the recording data 3 and the recorded data may be fatally damaged.

For this reason, in recent years, when starting and stopping,
A magnetic disk device is used in which the head slider 6 is supported away from the surface of the magnetic disk 3. Such a magnetic disk drive is, for example, shown in FIG.
It is configured as shown in FIG. This magnetic disk device 9 has the same configuration as the magnetic disk device 1 shown in FIG. 8 with respect to the housing 2, the magnetic disk 3, the head slider 6, and the voice coil motor 7, but further shows in detail in FIG. As described above, the lamp 9a is provided on the housing 2, and the load bar 9b is provided near the tip of the suspension 4b of the arm 4. The lamp 9a is
As shown in FIG. 17, along the trajectory of the load bar 9b when the arm 4 rotates to the outermost circumference of the magnetic disk 3, it is formed to be inclined like a slide, that is, the inside edge is low and the outside is low. It is formed so as to gradually increase.

According to the magnetic disk device 9 having such a configuration, when the arm 4 is not activated, the arm 4 is retracted outside the magnetic disk 3 and the load bar 9b is placed on the flat surface 9a1 on the left side of the ramp 9a. It is listed. As a result, the head slider 6 is separated from the surface of the magnetic disk 3 and held in the air. When starting from this state, first, the spindle motor starts up by turning on the power, and after the magnetic disk 3 reaches a predetermined number of revolutions, the arm 4 moves in the R1 direction shown in FIG.

At this time, the arm 4 rotates while the load bar 9b slides along the slope of the ramp 9a. When the load bar 9b separates from the ramp 9a, the head slider 6 is pressed against the surface of the magnetic disk 3 based on the elasticity of the suspension 4b, but the air flow between the head slider 6 and the surface of the magnetic disk 3 causes Since the levitation force acts on the head slider 6, the head slider 6 floats without contacting the surface of the magnetic disk 3 (the above operation is called load).

At the time of stop, the arm 4 rotates toward the stop position according to a stop command from a computer or the like or power off. At this time, the load bar 9b is
Since the head slider 6 rides on the slope a and slides along the slope, the head slider 6 separates from the surface of the magnetic disk 3. When the arm 4 reaches the stop position, the load bar 9b moves to the flat surface 9a1 continuous with the highest position of the ramp 9a, so that the head slider 6 separates from the surface of the magnetic disk 3 and enters the air. It is retained (the above operation is called unload). Thereafter, the spindle motor stops. In such a magnetic disk drive 9, since the head slider 6 does not come into contact with the surface of the magnetic disk 3 when starting and stopping, the N-CSS (Non-CSS)
(CSS) method or dynamic load / unload method.

By the way, when such a dynamic load / unload method is employed, the head slider 6 does not contact the surface of the magnetic disk 3 not only at the time of recording / reproduction but also at the time of non-use. Problems can be avoided reliably. For this reason, the magnetic disk 3
This eliminates the need for texturing or zone texturing on the surface of the magnetic disk 3 and allows the surface of the magnetic disk 3 to be smoothed to the utmost.
Is further reduced, and the density of the recording data of the magnetic disk device can be increased.

[0020]

In the magnetic disk device 9 of the dynamic load / unload type configured as described above, the gap between the magnetic disk 3 and the magnetic head 8 has been increased due to the recent demand for ultra-high density. The conditions imposed on the head slider 6 for determining the position of the head slider are becoming stricter year by year. That is, the floating gap between the magnetic disk 3 and the magnetic head 8 is also referred to as a gap loss in magnetic recording, and it is known that the smaller the gap, the smaller the loss.

In the magnetic disk drive, by keeping the gap constant over the entire circumference of the magnetic disk 3, the output of the magnetic head 8 is stabilized, and a stable signal is obtained. . Therefore, as a flying design technique of the head slider 6, a technique of reducing the flying height and a so-called CFH (Constant Flying He) for obtaining a constant flying height on the inner and outer circumferences of the magnetic disk 3 are described.
light) technology is required.

In the magnetic disk device 9 described above, since the magnetic disk 3 rotates at a constant angular velocity, the linear velocity differs between the inner circumference and the outer circumference of the magnetic disk 3. For this reason, the head slider 6 flies under the pressure of the airflow generated with the rotation of the magnetic disk 3, and since this pressure is proportional to the linear velocity, the head slider 6 is more outer than the inner circumference of the magnetic disk 3. The flying height is larger, and the flying height is proportional to the linear velocity, that is, the radius of the magnetic disk 3.

On the other hand, by using the arm 4, the so-called skew angle between the head slider 6 and the circumferential direction of the magnetic disk 3 changes between the inner circumference and the outer circumference of the magnetic disk 3. Thus, for example, when the linear velocity is constant, the flying height of the head slider 6 decreases quadratically with respect to the skew angle. Therefore, the flying height of the head slider 6 depends on the linear velocity and the skew angle, and does not always increase gradually from the inner circumference toward the outer circumference.

Therefore, in general, the magnetic disk drive 9
Is designed so that the skew angle becomes larger on the outer circumference side than on the inner circumference side of the magnetic disk 3, thereby reducing the flying height that increases due to the increase in the linear velocity from the inner circumference to the outer circumference of the magnetic disk 3. , The skew angle is increased. Here, since the increase in the flying height due to the increase in the linear velocity and the decrease in the flying height due to the increase in the skew angle are linear and quadratic functions, respectively, even if the increase and the decrease are designed to be canceled as much as possible. Since the second-order variation remains, it is difficult to realize CFH in the entire magnetic disk 3.

On the other hand, in recent years, as a new technology of the head slider, a so-called negative pressure head slider in which a negative pressure groove is provided on an air lubrication surface and a positive pressure by an air lubrication surface and a negative pressure by a negative pressure groove are used. Has been adopted. Since this negative pressure head slider generates a suction force toward the magnetic disk surface by the negative pressure groove, it is possible to design the floating amount to be constant at an arbitrary linear velocity, and furthermore, it is possible to design the air lubrication surface. By appropriately forming the shape, it is possible to design the floating amount at an arbitrary skew angle to be constant. Therefore, by using the negative pressure head slider, it is easy to realize CFH even in the case of a rotary arm.

However, in the case of such a negative pressure head slider, since a suction force is generated by the negative pressure, the magnetic disk drive 9 of the dynamic load / unload type is used.
When used in, the negative pressure is forcibly destroyed at the time of unloading. Therefore, the suspension 4b of the arm 4
And the suspension 4b vibrates greatly after the negative pressure is destroyed. Therefore, there is a problem that the unloading cannot be performed smoothly. Further, if the load and unload are repeated, in the worst case, the suspension 4b
May be deformed, or due to vibration after unloading,
There is a problem that the head slider 6 may come into contact with the surface of the magnetic disk 3 and damage the magnetic head 8 and the magnetic disk 3.

In view of the above points, the present invention can perform stable and safe unloading with a simple configuration even in a dynamic load / unload type magnetic disk drive using a negative pressure head slider. It is an object to provide a disk-shaped recording medium and a disk device.

[0028]

SUMMARY OF THE INVENTION According to the present invention, there is provided a magnetic head mounted on a negative pressure head slider which fluctuates while floating from a surface by a predetermined flying height. A disk-shaped recording medium in which the negative pressure head slider is dynamically loaded and unloaded in an unload area near the outer periphery, and is achieved by forming a groove in the unload area.

Further, according to the present invention, there is provided a disk-shaped recording medium, driving means for driving the disk-shaped recording medium to rotate, and a rotating means supported to be swingable with respect to the disk-shaped recording medium. A dynamic actuator, driving means for swinging the rotary actuator, a negative pressure head slider attached to a tip of the rotary actuator, and a negative pressure head slider attached to the negative pressure head slider, and A magnetic head for recording and reproducing information, and a dynamic load / unload device for lifting the rotary actuator at the outermost periphery of the disk-shaped recording medium, wherein the disk-shaped recording medium is This is achieved by providing a groove in the unload area near the outer periphery.

According to the above configuration, since the groove is formed in the unload area near the outer periphery of the disk-shaped recording medium,
Even if the negative pressure head slider comes to the unload area, the presence of the groove reduces the suction force due to the negative pressure between the negative pressure head slider and the disk-shaped recording medium. Therefore, in the unload area, the head slider is smoothly unloaded, so that the stress applied to the suspension or the like at the time of unloading is suppressed, and the vibration of the suspension or the like does not occur after the unloading. Media and head damage can be avoided,
Stable and safe unloading can be performed.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples 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 the configuration of a disk device having a first embodiment of a disk-shaped recording medium to which the present invention is applied. This disk device is a magnetic disk device 10, and includes a housing 11 formed of an aluminum alloy or the like, a spindle motor (not shown) disposed on a flat portion of the housing 11, and a rotation at a constant angular velocity by the spindle motor. Magnetic disk 12, which is a disk-shaped recording medium to be driven, rotary actuator 13, and ramp 1
4 is provided.

The rotary actuator 13 includes a negative pressure head slider 13a, a suspension 13b supporting the negative pressure head slider 13a, and a suspension 13b.
, A vertical shaft 13d rotatably supporting one end of the arm 13c, and a motor 13e for rotating the arm 13c about the vertical axis 13d. The negative pressure head slider 13a has an air lubrication surface on the lower surface and a negative pressure groove formed on the air lubrication surface, and the air pressure is generated by being pressed against the surface of the rotating magnetic disk 12 by the suspension 13b. By receiving a positive pressure due to the airflow flowing between the lubricating surface and the surface of the magnetic disk 12 and receiving a negative pressure generated in the negative pressure groove, the magnetic disk 12 floats at a small interval from the surface of the magnetic disk 12.

The suspension 13b acts as a spring based on its elasticity, and presses the negative pressure head slider 13a against the surface of the magnetic disk 12 with a predetermined load.
The arm 13c is formed of a rigid material, and performs a seek operation by rotating the negative pressure head slider 13a substantially in the radial direction of the magnetic disk 12 by rotating about the vertical axis 13d. . This allows
A magnetic head (not shown) attached to the negative pressure head slider 13a accesses a predetermined track on the magnetic disk 12.

The motor 13e includes a voice coil 13f attached to the other end of the arm 13c, and a magnet 13g fixedly arranged on the housing 11. When a driving voltage is externally supplied to the voice coil 13f,
The arm 13c, based on the force generated by the magnetic field of the magnet 13g and the current flowing through the voice coil 13f,
It is rotated around the vertical axis 13d. Therefore, arm 13
negative pressure head slider 13a attached to the other end of c
Moves substantially in the radial direction of the magnetic disk 12, so that the magnetic head (not shown) provided on the negative pressure head slider 13a performs a seek operation on the magnetic disk 12 to Recording and reproduction of information on a predetermined track is performed.

The ramp 14 is fixed to the housing 11 and slides along a locus of a load bar 13h provided at the tip of the rotary actuator 13 when the rotary actuator 13 rotates. It is formed so that the inside edge is low and the outside gradually increases.
The load bar 13h is provided integrally with the suspension 13b of the rotary actuator 13. Thus, when the rotary actuator 13 is retracted to the outside of the magnetic disk 12 when stopped, the load bar 13h rides on the slope of the ramp 14, and the negative pressure head slider 13a unloads near the outer periphery of the magnetic disk 12. Unloaded away from the area.

The above configuration is the same as the configuration of the conventional magnetic disk device 9 shown in FIG. 15, but the magnetic disk 12 of the magnetic disk device 10 has a structure as shown in FIG.
The configuration is different in that a plurality of (four in the illustrated case) grooves 12a concentric with the magnetic disk 12 are provided in an unload area near the outer periphery.

An operation example of such a configuration will be described. When not in use, the rotary actuator 13 is
The load bar 13h is placed at the highest position outside the ramp 14 in a state of being retracted outside the magnetic disk 12. As a result, the negative pressure head slider 13a of the rotary actuator 13 is separated from the surface of the magnetic disk 12 and held in the air. When the power of the magnetic disk drive 10 is turned on from this state, the spindle motor starts up and reaches a predetermined number of revolutions.
The voice coil 13f of e is energized, and the rotary actuator 13 rotates inward.

At this time, the rotary actuator 13 rotates while its load bar 13h slides along the slope of the ramp 14. And load bar 13h
Is separated from the ramp 14, and the negative pressure head slider 13a is pressed against the surface of the magnetic disk 12 based on the elasticity of the suspension 13b. The magnetic disk 12 floats without contacting the surface of the magnetic disk 12 by receiving a positive pressure (levitation force) by the flow and receiving a negative pressure generated in the negative pressure groove. Thereby, the negative pressure head slider 1
The magnetic head provided in 3a performs a seek operation on the magnetic disk 12 to record and reproduce information on a predetermined track on the magnetic disk 12.

At the time of stop, the motor 13e is driven by a stop command from a computer or the like or the power is turned off, and the rotary actuator 13 rotates outward. At this time, the load bar 1 of the rotary actuator 13 is
3h rides on the slope of the ramp 14 and slides along the slope, so that the head slider 13a separates from the surface of the magnetic disk 12. When the load bar 13h of the rotary actuator 13 reaches the highest position (stop position) of the ramp 14, the rotation of the rotary actuator 13 is stopped, and the negative pressure head slider 13a is moved to the surface of the magnetic disk 12. And is held in the air. afterwards,
The spindle motor 22 stops.

Here, when the negative pressure head slider 13a comes to the unload area near the outer periphery of the magnetic disk 12 due to the outward rotation of the rotary actuator 13, the above-described concentric circle is formed in the unload area. Since the groove 12a is formed, the generation of a negative pressure between the negative pressure groove of the negative pressure head slider 13a and the surface of the magnetic disk 12 is disturbed by the groove 12a, and the negative pressure decreases. Will be. In particular, since the groove 12a extends in the circumferential direction, the negative pressure head slider 1
3a becomes parallel to the groove 12a, and this groove 12a
Above, the roll fluctuation of the negative pressure head slider 13a increases, and the negative pressure decreases.

For this reason, when the load bar 13h of the rotary actuator 13 rides on the slope of the ramp 14,
The negative pressure head slider 13a can easily move the magnetic disk 12
The stress on the suspension 13b of the rotary actuator 13 and the load on the motor 13e are reduced, and the negative pressure head slider 13a
No vibration is generated in the suspension 13b after the separation from the surface of the magnetic disk 12. Therefore, the suspension 13b is not deformed by repeated loading and unloading, and the magnetic head and the magnetic disk 12 are not damaged by the vibration of the suspension 13b.

FIG. 3 shows a second embodiment of the magnetic disk to which the present invention is applied. This magnetic disk 20
Is provided with a plurality of grooves 21 extending radially with respect to the center of the magnetic disk 20 in an unload area near the outer periphery. According to the magnetic disk 20 having such a configuration, when the magnetic disk 20 is stopped, the negative pressure head slider 13a is moved to the vicinity of the outer periphery of the magnetic disk 20 by the outward rotation of the rotary actuator 13 due to a stop command from a computer or the like or the power off. In the unload area, the radial groove 21 is formed in the unload area.
Negative pressure groove of negative pressure head slider 13a and magnetic disk 20
The generation of the negative pressure between the surfaces is disturbed by the groove 21, and the negative pressure decreases. In particular, groove 2
1 extend radially, the traveling direction of the negative pressure head slider 13a with respect to the magnetic disk 20 is substantially orthogonal to the groove 21, and the pitch fluctuation of the negative pressure head slider 13a on this groove 21 As a result, the negative pressure decreases.

Therefore, when the load bar 13h of the rotary actuator 13 rides on the slope of the ramp 14,
The negative pressure head slider 13a can easily move the magnetic disk 20.
The stress on the suspension 13b of the rotary actuator 13 and the load on the motor 13e are reduced, and the negative pressure head slider 13a
No vibration occurs in the suspension 13b after the separation from the surface of the magnetic disk 20. Therefore, the suspension 13b is not deformed by repeated loading and unloading, and the magnetic head and the magnetic disk 20 are not damaged by the vibration of the suspension 13b.

FIG. 4 shows a third embodiment of the magnetic disk to which the present invention is applied. This magnetic disk 30
Is provided with a plurality of grooves 31 formed at equal angular intervals in the circumferential direction in an unload area near the outer periphery. As shown in FIG. 4B, the groove 31 is formed so as to extend along the movement locus of the negative pressure head slider 13a due to the rotation R of the rotary actuator 13.

According to the magnetic disk 30 having such a configuration, when the magnetic disk 30 is stopped, the negative pressure head slider 13a is moved outward by the rotation type actuator 13 in response to a stop command from a computer or the like or the power is turned off.
In the unload area near the outer circumference of 0, since the above-described groove 31 is formed, the negative pressure between the negative pressure groove of the negative pressure head slider 13a and the surface of the magnetic disk 30 is increased. Is disturbed by the groove 31, and the negative pressure decreases. In particular, the groove 31
Extend along the movement locus of the negative pressure head slider 13a described above, the traveling direction of the negative pressure head slider 13a with respect to the magnetic disk 30 is completely orthogonal to the groove 31. The fluctuation of the pitch of the negative pressure head slider 13a is further increased, and the negative pressure is further reduced.

Therefore, when the load bar 13h of the rotary actuator 13 rides on the slope of the ramp 14,
The negative pressure head slider 13a can easily move the magnetic disk 30
The stress on the suspension 13b of the rotary actuator 13 and the load on the motor 13e are reduced, and the negative pressure head slider 13a
No vibration occurs in the suspension 13b after the separation from the surface of the magnetic disk 30. Therefore, the suspension 13b is not deformed by repeated loading and unloading, and the magnetic head and the magnetic disk 30 are not damaged by the vibration of the suspension 13b.

FIG. 5 shows a fourth embodiment of the magnetic disk to which the present invention is applied. This magnetic disk 40
Is provided with a plurality of grooves 41 formed at equal angular intervals in the circumferential direction in an unload area near the outer periphery. This groove 41 is, as shown in FIG.
The magnetic disk 40 extends substantially along the locus of movement of the negative pressure head slider 13a due to the rotation R of the magnetic disk 40, and protrudes in a flat V-shape near the center in the radial direction of the magnetic disk 40 toward one side in the circumferential direction. , A so-called herringbone shape.

According to the magnetic disk 40 having such a configuration, when the magnetic disk 40 is stopped, the negative pressure head slider 13a is moved outward by the rotation of the rotary actuator 13 in response to a stop command from a computer or the like or the power is turned off.
In the unload area near the outer circumference of 0, the groove 41 is formed in the unload area, so that the negative pressure between the negative pressure groove of the negative pressure head slider 13a and the surface of the magnetic disk 40 is reduced. Is disturbed by the groove 41, and the negative pressure decreases. In particular, the groove 41
Is substantially extended along the movement locus of the negative pressure head slider 13a described above, and is formed in a herringbone shape, so that the air flow generated in the groove 41 flows along the groove 41, The power is effectively supplied to the negative pressure head slider 13a. Therefore, this groove 4
The negative pressure due to the negative pressure groove of the negative pressure head slider 13a is offset by the positive pressure due to the airflow from 1,
The negative pressure will be further reduced.

Therefore, when the load bar 13h of the rotary actuator 13 rides on the slope of the ramp 14,
The negative pressure head slider 13a can easily move the magnetic disk 40
The stress on the suspension 13b of the rotary actuator 13 and the load on the motor 13e are reduced, and the negative pressure head slider 13a
No vibration is generated in the suspension 13b after the separation from the surface of the magnetic disk 40. Therefore, the suspension 13b is not deformed by repeated loading and unloading, and the magnetic head and the magnetic disk 40 are not damaged by the vibration of the suspension 13b.

FIG. 6 shows a fifth embodiment of the magnetic disk to which the present invention is applied. This magnetic disk 50
Has a single groove 51 concentric with the magnetic disk 12 in the unload area near the outer periphery. As shown in FIG. 7, the groove 51 is formed to have a width substantially equal to the width of the negative pressure groove 13a1 formed on the air lubrication surface of the negative pressure head slider 13a.

According to the magnetic disk 50 having such a configuration, when the magnetic disk 50 is stopped, the negative pressure head slider 13a is moved outward by the rotation type actuator 13 in response to a stop command of a computer or the like or the power is turned off.
In the unload area near the outer periphery of the negative pressure head slider 13a, the depth of the negative pressure groove 13a1 of the negative pressure head slider 13a is substantially reduced. The negative pressure groove 13a
1, the negative pressure will decrease. Therefore, this groove 5
The negative pressure due to the negative pressure groove of the negative pressure head slider 13a is offset by the positive pressure due to the airflow from 1,
The negative pressure will be further reduced.

Therefore, when the load bar 13h of the rotary actuator 13 rides on the slope of the ramp 14,
The negative pressure head slider 13a can easily move the magnetic disk 50.
The stress on the suspension 13b of the rotary actuator 13 and the load on the motor 13e are reduced, and the negative pressure head slider 13a
No vibration occurs in the suspension 13b after the separation from the surface of the magnetic disk 50. Therefore, the suspension 13b is not deformed by repeated loading and unloading, and the magnetic head and the magnetic disk 50 are not damaged by the vibration of the suspension 13b.

In each of the above embodiments, each groove 12
a, 21,31,41,51 have the following
The minimum size that affects the flying (for example, about 1/100 of the rail width as the air lubrication surface) is the lower limit, and the size does not exceed the size of the negative pressure head slider 13a so that the negative pressure head slider 13a does not drop. (Eg 1
In the case of a negative pressure head slider having a width of
μm) is the upper limit. Therefore, the size of the groove is desirably about 10 μm to 1000 μm. Also,
Similarly, regarding the depth of the groove, the minimum size (for example, about 1/5 of the flying height) that affects the flying height is the lower limit, and the size that prevents the negative pressure head slider 13a from falling is the upper limit. . Therefore, specifically, the depth of the groove is 0.01 μm to 10 μm when the flying height is 0.05 μm.
About 0 μm is desirable.

In each of the above embodiments, each groove 1
2a, 21, 31, 41, and 51 are formed, for example, as follows. That is, when the magnetic disk is a glass substrate, grooves are formed by physical etching, chemical etching or molding. When the magnetic disk is an aluminum substrate, grooves are formed by physical etching, chemical etching or press working. Further, when the magnetic disk is a plastic substrate, the grooves are formed by physical etching, chemical etching or press working, or by integral molding at the time of working. Also,
Although the above embodiment has described the magnetic disk device, the present invention is not limited to this, and the present invention can be applied to a disk device for recording or reproducing another type of disk such as a magneto-optical disk or an optical disk. .

[0056]

As described above, according to the present invention, stable and safe unloading can be achieved with a simple configuration even in a dynamic load / unload type magnetic disk drive using a negative pressure head slider. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a magnetic disk drive including a magnetic disk according to a first embodiment of the present invention.

FIG. 2 is a partial perspective view and a partial plan view showing the configuration of a magnetic disk in the magnetic disk device of FIG.

FIG. 3 is a partial perspective view and a partial plan view showing the configuration of a second embodiment of the magnetic disk according to the present invention.

FIG. 4 is a partial plan view showing a configuration of a third embodiment of the magnetic disk according to the present invention, and a schematic plan view showing a rotation locus of a rotary actuator.

FIG. 5 is a partial plan view showing the configuration of a fourth embodiment of the magnetic disk according to the present invention.

FIG. 6 is a partial perspective view showing the configuration of a fifth embodiment of the magnetic disk according to the present invention.

7 is a plan view of a negative pressure head slider facing a groove and a schematic diagram showing a relationship between the groove and the negative pressure head slider in the magnetic disk of FIG. 6;

FIG. 8 is a schematic perspective view showing an example of a conventional magnetic disk drive.

FIG. 9 is a schematic perspective view showing a relationship between a magnetic disk and an arm in the magnetic disk device of FIG. 8;

FIG. 10 is a schematic perspective view showing a flying head slider in the magnetic disk device of FIG. 8;

FIG. 11 is a schematic diagram showing a flying state of the flying head slider of FIG. 10;

FIG. 12 is a schematic perspective view showing a CSS area of a magnetic disk in the magnetic disk device of FIG. 8;

FIG. 13 is a schematic perspective view showing a texture formed in a CSS area of the magnetic disk of FIG. 12;

FIG. 14 is an enlarged perspective view of the texture of FIG. 13;

FIG. 15 is a schematic perspective view showing an example of a conventional dynamic load / unload magnetic disk device.

16 is a schematic perspective view showing a dynamic load / unload mechanism in the magnetic disk device of FIG.

FIG. 17 is a schematic front view showing a dynamic load / unload mechanism in the magnetic disk device of FIG. 15;

[Explanation of symbols]

10: magnetic disk drive, 11: housing, 12
..Magnetic disk, 12a groove, 13 rotary actuator, 14 ramp, 20, 30, 4
0, 50 ... magnetic disk, 21, 31, 41, 51
···groove

Claims (7)

[Claims] 1. A magnetic head mounted on a negative pressure head slider that fluctuates while levitating from a surface by a predetermined flying height to record and reproduce information, and that the negative pressure head slider in an unload area near the outer periphery. Is a disk-shaped recording medium to be dynamically loaded and unloaded, wherein a groove is formed in the unload area. 2. The disk-shaped recording medium according to claim 1, wherein the groove is at least one groove formed concentrically. 3. The disk-shaped recording medium according to claim 1, wherein the grooves are a plurality of grooves formed at equal angular intervals in a circumferential direction so as to extend radially. 4. The disk-shaped recording according to claim 1, wherein the grooves are a plurality of grooves formed at equal angular intervals in a circumferential direction so as to extend along a movement locus of the negative pressure head slider. Medium. 5. A circumferential surface such that the groove extends substantially along a movement trajectory of the head slider, and furthermore, a portion near the center in the radial direction projects in a flat V-shape toward one side in the circumferential direction. 2. The disc-shaped recording medium according to claim 1, wherein the disc-shaped recording medium is a plurality of grooves formed at equal angular intervals in the direction. 6. The disk-shaped recording medium according to claim 1, wherein said groove is a groove formed concentrically and having substantially the same width as the negative pressure groove of said negative pressure head slider. 7. A disk-shaped recording medium; driving means for driving the disk-shaped recording medium to rotate; a rotary actuator swingably supported with respect to the disk-shaped recording medium; A driving means for swinging the rotary actuator; a negative pressure head slider attached to the tip of the rotary actuator; and a magnetic head attached to the negative pressure head slider for recording and reproducing information on the disk-shaped recording medium. A dynamic load unloading device that lifts the rotary actuator at the outermost periphery of the disk-shaped recording medium, wherein the disk-shaped recording medium has a groove in an unload area near the outer periphery thereof. A disk device, comprising: