JPH08227569A - Magnetic disk device - Google Patents

Abstract

PURPOSE: To obtain a miniature magnetic disk device having large capacity, which is capable of stably recording and reproducing without generating damage on the surface of the magnetic disk. CONSTITUTION: The magnetic disk formed with the thickness of 0.635mm while having the recording density larger than 150 tracks/mm in the radial direction is mounted on a hub of a spindle motor. A magnetic head assembly supported by a carriage assembly so as movable on the surface of magnetic disk is provided with a slider 52 arranged on the magnetic head 64. The slider is formed in nearly the rectangular state, then the width W along nearly the radial direction of magnetic disk is made shorter than about 1mm, and the length L along nearly the direction perpendicular to the radial direction is made shorter than about 1.3mm. Edge parts 66c, 66d, 66e and angle parts 66a, 66b of the slider confronted with the surface of magnetic disk are formed by being rounded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device,
In particular, the present invention relates to a magnetic disk device used in portable computers such as laptop computers and book computers.

[0002]

2. Description of the Related Art Generally, in a small portable computer such as a personal computer, a laptop computer and a book computer, a magnetic disk device is used as a memory for storing a large amount of information. Further, in order to improve the portability of this type of computer, further miniaturization and improvement in processing capacity are being promoted, and along with this, there is a demand for miniaturization and large capacity of the magnetic disk device.

A magnetic disk device usually has a spindle motor for rotationally driving a magnetic disk as a recording medium,
A magnetic head assembly for performing recording and reproduction on a magnetic disk and a head actuator for moving and positioning the magnetic head on a desired track of the magnetic disk are provided.

For example, in a magnetic disk device having two magnetic disks mounted thereon, the magnetic disks are stacked on the outer circumference of a hub of a spindle motor and fixed by a clamper screwed to the upper end of the hub. The magnetic head assembly has a rectangular slider on which the magnetic head is formed, and a suspension that supports the slider and applies a predetermined load to the magnetic head. A plurality of magnetic disks are provided so as to sandwich each magnetic disk from both sides. The head arc actuator
It is composed of a plurality of arms supporting a plurality of magnetic head assemblies and a voice coil motor for rotating these arms.

During operation of the magnetic disk device, the spindle motor rotates the magnetic disk at a predetermined speed, and the head actuator moves the magnetic head onto a desired track of the corresponding magnetic disk. Further, each slider formed with the magnetic head floats above the surface of the magnetic disk by a predetermined amount by the air flow generated by the rotation of the magnetic disk.

In order to reduce the size of the magnetic disk device having the above-described structure, in particular, to reduce the thickness, a method of reducing the thickness of the magnetic disk itself can be considered. Further, in order to increase the capacity of the magnetic disk device, a method of increasing the recording density in the radial direction of each magnetic disk and a method of increasing the number of mounted magnetic disks can be considered.

[0007]

Generally, a magnetic disk is distorted in the circumferential direction due to the tightening force of a clamper that fixes the magnetic disk to the hub of the spindle motor. As described above, when the thickness of the magnetic disk is reduced to reduce the thickness, the rigidity of the magnetic disk is reduced and the amount of deformation of the magnetic disk due to the tightening force increases.
In theory, this amount of deformation is proportional to the cube of the thickness of the magnetic disk. For example, if the thickness of the magnetic disk is 0.889 mm to 0.635 m
When thinned to m, the amount of deformation increases by about 30%.

When the amount of deformation of the magnetic disk, that is, the deflection in the circumferential direction increases, the waviness of the magnetic disk surface also increases, and the slider on which the magnetic head is formed must move following the waviness of the magnetic disk surface. Will be difficult.
As a result, the flying height of the slider with respect to the surface of the magnetic disk fluctuates, and stable recording / reproducing becomes difficult.

Further, when the flying height of the slider becomes unstable due to the increase of the waviness on the surface of the magnetic disk as described above,
There is a problem that the slider comes into contact with the surface of the magnetic disk and the edge or corner of the slider damages the magnetic disk.

On the other hand, when the number of magnetic disks mounted is increased to increase the storage capacity, the vibration amplitude of the pivot shaft of the spindle motor supporting the hub on which the magnetic disks are mounted increases. Therefore, it is difficult to increase the tracking accuracy of the magnetic head, and it is difficult to increase the radial recording density of the magnetic disk.

In order to reduce the vibration of the spindle of the spindle motor, it may be considered that the spindle is supported by both ends, but in this case, the following problems occur. That is,
In the case of the double-support structure, the clamper for fixing the magnetic disk cannot be fixed to the hub with a single screw, and the clamper is fixed with the multiple screws spaced from each other along the circumferential direction of the magnetic disk. Need to be fixed to. However, in this case, due to the influence of the plurality of screws, the magnetic disk has a number of undulations corresponding to the number of screws. Therefore, as in the case where the magnetic disk is made thin, the flying height of the slider becomes unstable, and the recording and reproduction accuracy is deteriorated and the magnetic disk is damaged by the contact of the slider.

The present invention has been made in view of the above points, and it is an object of the present invention to perform stable recording / reproducing without damaging the surface of a magnetic disk.
An object is to provide a magnetic disk device that can be downsized and have a large capacity.

[0013]

In order to achieve the above object, a magnetic disk device according to claim 1 of the present invention comprises
A magnetic disk having a radial recording density of track / mm or less and a thickness of 0.635 mm or less;
A rotating mechanism for holding and rotating the magnetic disk, a magnetic head assembly having a magnetic head for recording and reproducing information on and from the magnetic disk, and the magnetic head assembly being movable with respect to the magnetic recording medium. A supported carriage assembly and a head actuator that moves the carriage assembly to position the magnetic head at an arbitrary position on the magnetic disk are provided. The magnetic head assembly has a substantially rectangular slider that is positioned to face the surface of the magnetic disk and is provided with the magnetic head, and supports the slider to apply a predetermined load to the magnetic head. A slider for applying a magnetic field to the slider, and the slider is formed such that the width of the slider along the radial direction of the magnetic disk is about 1 mm or less.
The length along the direction almost orthogonal to the radial direction is about 1.3 mm
It is characterized in that it is formed below.

A magnetic disk device according to a fifth aspect of the present invention has a radial recording density of 150 tracks / mm or less and a magnetic disk formed to have a thickness of 0.635 mm or less; A rotation mechanism for holding and rotating the magnetic disk, a magnetic head assembly having a magnetic head for recording and reproducing information on the magnetic disk, and a carriage for movably supporting the magnetic head assembly with respect to the magnetic recording medium. An assembly; and a head actuator that moves the carriage assembly to position the magnetic head at an arbitrary position on the magnetic disk, wherein the magnetic head assembly is positioned to face the surface of the magnetic disk. And a substantially rectangular slider provided with the magnetic head and the magnetic head supporting the slider. In and a suspension for applying a predetermined load, characterized in that at least one of the edges and corners of the slider opposed to the magnetic disk surface is formed Te rounding et al.

[0015]

According to the magnetic disk device of the first aspect, the planar shape of the slider on which the magnetic head is provided is reduced in size, so that the followability of the slider to the surface of the magnetic disk is improved. Therefore, even if the surface of the magnetic disk is undulated by thinning the magnetic disk, the flying height of the slider is stable and good recording / reproducing can be performed. Therefore, it is possible to reduce the thickness of the entire device.

Further, as described in claim 2, even if a plurality of undulations are generated on the surface of the magnetic disk due to the clamping force of the clamper, the pivot of the rotating mechanism has a double-supported structure, and the flying height of the slider is the same as above. Can be maintained stably. Therefore, even when the number of magnetic disks mounted is increased, the vibration of the hub can be suppressed to improve the tracking accuracy, and at the same time, the storage capacity can be increased.

On the other hand, according to the magnetic disk device of the fifth aspect, since at least one of the edge and the corner of the slider facing the surface of the magnetic disk is formed to be rounded, these edges or Even if the corner contacts the surface of the magnetic disk, damage to the surface of the magnetic disk is prevented. It is possible to reduce the thickness of the magnetic disk or increase the number of mounted magnetic disks without damaging the surface of the magnetic disk due to the contact of the slider.

[0018]

Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 and 2, the magnetic disk device according to the present invention includes a housing 10. The casing 10 has a rectangular box shape with an open upper end, that is, a main body 12 having a rectangular bottom wall 12a and side walls erected on the side edges of the bottom wall, and a main body screwed to the main body by a plurality of screws 11. Top cover 1 that closes the upper opening of the
4 and. The top cover 14 is formed of a high-strength iron-based metal plate having a thickness of 0.4 mm. A packing 13 is interposed between the top cover 14 and the main body 12.

In the case 10, a magnetic recording medium 3
A plurality of magnetic disks 16a, 16b, 16c, a rotating mechanism 18 for supporting and rotating these magnetic disks, a plurality of magnetic head assemblies 20 each having a magnetic head for recording and reproducing information on and from the magnetic disks, A carriage assembly 22 as a supporting means for rotatably supporting the magnetic head assembly, a voice coil motor 24 as a moving means for rotating and positioning the carriage assembly, a preamplifier 21, and the like are stored. A printed circuit board 19 for controlling the operations of the rotating mechanism 18, the voice coil motor 24, and the magnetic head assembly 20 is screwed to the outer surface of the main body 12, and is positioned to face the bottom wall 12a of the main body.

The rotating mechanism 18 has a spindle motor 25. The spindle motor 25 is fitted in a through hole 26 formed in the bottom wall 12a of the housing 10 and is also a bracket 27 screwed to the bottom wall with three screws.
And a pivot 28 having a lower end fixed to the bracket and provided upright in the housing 10, and a cylindrical hub 32 rotatably supported by the pivot through a pair of ball bearings 30. .

Each magnetic disk 16a, 16b, 16c
Has a disk-shaped glass substrate having a central hole and magnetic layers formed on both sides of the glass substrate, and has a diameter of 65 mm.
(2.5 inches) and a thickness of about 0.635 mm.
Each magnetic disk has 150 tracks / mm (3810TP
It has the radial recording density of I).

Three magnetic disks 161, 16b, 16
c are coaxially fitted to the outer peripheral surface of the hub 32 of the spindle motor 25, and are stacked along the axial direction of the hub. A spacer ring 33 fitted to the hub 32 is interposed between two adjacent magnetic disks. At the upper end of the hub 32, a plurality of, for example, four screws 3 each having an annular fixing ring 36 spaced from each other along the circumferential direction.
It is screwed by 4.

The fixed ring 36 has an outer diameter larger than the diameter of the hub 32 and the inner diameter of each magnetic disk 16.
Thereby, the magnetic disks 16a, 16b, 16c are
Flange and fixing ring 3 formed on the lower end of the hub 32
It is sandwiched between 6 and 6 via a spacer ring 33, and is rotatably fixed to the hub 32 integrally therewith. Then, these magnetic disks 16 are
It is rotationally driven by 5 at a predetermined speed.

A screw hole is formed in the upper end of the pivot 28 of the spindle motor 25, and the housing 10 is inserted in this screw hole.
A screw 40 is screwed in through a through hole 38 formed in the top cover 14 of FIG. That is, the lower end of the pivot 28 is fixed to the bracket 27 of the spindle motor 25, the upper end thereof is fixed to the top cover 14, and both ends are supported.

As shown in FIGS. 1 to 4, the carriage assembly 22 includes a bearing assembly 42 fixed on the bottom wall 12 a of the housing 10. This bearing assembly 42
Is a pivot 43 that is erected on the bottom wall 12 a of the housing 10 in parallel with the pivot 28 of the spindle motor 25, and a pair of bearings 44.
And a cylindrical hub 46 that is rotatably supported by the pivot 43 via the. An annular flange 47a having a thickness of about 0.5 mm is formed on the lower end of the hub 46, and a screw portion 47b is formed on the outer periphery of the upper end.

A screw hole is formed at the upper end of the pivot 43, and a screw 41 is screwed into the screw hole through a through hole 39 formed in the top cover 14. Therefore, the pivot 43 is supported by the bottom wall 12 a of the main body 12 and the top cover 14 at both ends.

The carriage assembly 22 includes six arms 48a to 48 attached to the hub 46.
f and a plurality of spacer rings, and these six arms respectively support the six magnetic head assemblies 20. Each of the arms 48a to 48f is, for example,
Plate thickness of 0.3 due to stainless steel materials such as SUS304
It is formed into a thin flat plate with a size of mm or less, and a circular through hole 30 is formed at one end thereof, that is, the base end.

Each magnetic head assembly 20 includes an elongated suspension 50 formed of a leaf spring, a slider 52 fixed to the suspension, and a magnetic head provided on the slider. Suspension 50
Has its base end fixed to the tips of the arms 48a to 48f by spot welding or adhesion and extends from the arms. As will be described later, the slider 52 is formed in a substantially rectangular shape. The suspension 30 is fixed to a gimbal portion (not shown) formed at the tip of the suspension 30. The suspension 50 may be formed integrally with the arm by using the same material as the arm.

The fixed arms 48a to 48f of the magnetic head assembly 20 are fitted on the outer circumference of the hub in a state of being stacked on the flange 47a by inserting the hub 46 into the through hole 30.

Further, on the outer circumference of the hub 46, three first spacer rings 53, two second spacer rings 54,
And one third spacer ring 55 is fitted. The first spacer ring 53 has arms 48, respectively.
It is located between a and 48b, between arms 48c and 48d, and between arms 48e and 48f. The second spacer ring 54 is formed to have a thickness of about 0.2 mm and has arms 48b and 48c.
And between the arms 48d and 48e. The third spacer ring 55 is formed to have a thickness equal to or larger than the plate thickness of the arm and is located between the uppermost arm 48a and the screw portion 27b.

The six arms 48a to 48f and the first to third spacer rings 53, 54, 55 laminated on the flange 47a of the hub 46 and the nut 56 screwed to the threaded portion 47b of the hub. It is sandwiched between the flange 47 a and the flange 47 a, and is fixedly held on the outer periphery of the hub 46.
As a result, the six arms 48a to 48f are positioned parallel to each other with a space therebetween and extend from the hub 46 in the same direction.

The slider 52 of the magnetic head assembly 20 attached to the arms 48a and 48b is the magnetic disk 16
a are sandwiched between the arms 48
The sliders 52 of the magnetic head assembly 20 attached to c and 48d are located opposite to each other with the magnetic disk 16b interposed therebetween. Similarly, the sliders 52 of the magnetic head assembly 20 attached to the arms 48e and 48f are The magnetic disks 16c are located so as to face each other with the magnetic disk 16c interposed therebetween. Then, each slider 52 is biased toward the opposing magnetic disk by the suspension 50,
The magnetic disk is in contact with the magnetic disk with a load of about 4 g when the magnetic disk is stopped. Arms 48a to 48f and magnetic head assembly 20 fixed to these arms
Is rotatable around the pivot 43 integrally with the hub 46.

As shown in FIGS. 4 to 6, the slider 5
2 has a flat rectangular parallelepiped shape, and one surface thereof is fixed to the gimbal portion of the suspension 50. Further, the slider 52 has a pair of skis 62 projectingly formed on the surface facing the magnetic disk (which will be described as a representative of the magnetic disk 16a). These skis 62 extend parallel to each other along the extending direction of the suspension 50, that is, substantially along the tangential direction of the magnetic disk 16a, and are provided at a predetermined distance from each other.
Each ski 6 with respect to the rotation direction a of the magnetic disk 16a
The upstream end of 2 is formed with an inclined portion 62a that is inclined toward the surface of the magnetic disk.

The magnetic head 64, which is a thin film head, is formed on the side surface of the slider 52 located on the extended end side of the suspension 50, and is adjacent to one ski 62, particularly the ski 62 located on the outer peripheral side of the magnetic disk 16a. Is located. The gap width of the magnetic head 64 is 5.5 ± 0.
It is formed to have a thickness of 5 μm.

The edges and corners of the slider 52 facing the surface of the magnetic disk 16a are rounded. That is, as can be seen from FIGS. 5 and 7,
Four corners 66 located at both longitudinal ends of each ski 62
a, two corners 66b formed between the flat portion of the ski bottom and the inclined portion 62a, edges 66c of both ends of the ski extending in the width direction of the slider 52, and between the flat portion of the ski bottom and the inclined portion 62a. The edge portion 66d formed in and the two edge portions 66e extending in the longitudinal direction of the ski are formed by being rounded.

The slider 52 having the above structure has a thickness T
Is 0.3 mm, the width W of the magnetic disk 16a in the substantially radial direction is 1.0 mm, and the length L in the direction substantially orthogonal to the radial direction of the magnetic disk is 1.3 mm.

On the other hand, as shown in FIGS. 1 to 4, the first spacer ring 53 located in the middle has two support frames 58 extending in the direction opposite to the arms. A voice coil 60 forming a part of the voice coil motor 24 is fixed to the. At one end of the support frame 58, the carriage assembly 22
A stopper pin 59 is provided upright to regulate the rotation range of the.

The voice coil motor 24 includes a substantially fan-shaped lower yoke 70 fixed to the bottom wall 12a of the main body 12 of the housing 10, and a substantially fan-shaped upper yoke 72 facing the lower yoke with a predetermined distance. , A permanent magnet 74 fixed to the inner surface of the lower yoke and facing the upper yoke. Voice coil 60 fixed to the support frame 58
Is located between the upper yoke 72 and the permanent magnet 74, and is movable between them.

In the magnetic disk device configured as described above, when the spindle motor 25 is driven via the printed board 19 and the preamplifier 21, the three magnetic disks 16a to 16c rotate at a speed of 4200 rpm. To be done. As shown in FIG. 9, an air flow is generated by the rotation of the magnetic disk (which will be described as a representative of the magnetic disk 16a), and this air flow is generated by the slider 5 of the magnetic head assembly 20.
2 flows from the side of the inclined portion 62a between the slider and the surface of the magnetic disk. As a result, the slider 52 floats above the surface of the magnetic disk 16 by a predetermined amount against the biasing force of the suspension 50.

Then, when the coil 60 of the voice coil motor 24 is energized via the printed board 19 and the preamplifier 21, the magnetic flux generated from the coil and the permanent magnet 74 are generated.
Due to the interaction with the magnetic flux from the carriage assembly 22, the carriage assembly 22 is rotated by an angle in accordance with the amount of energization. Thereby,
The slider 52 of the magnetic head assembly 20 supported by the carriage assembly 22 moves in a floating state on the surface of the magnetic disk along the radial direction of the magnetic disk 16a.
It is located on the desired track of the magnetic disk. Then, by the magnetic head 64 provided on the slider 52,
Information is recorded on and reproduced from the magnetic disk 16a.

According to the magnetic disk device constructed as described above, each magnetic disk has a thickness of 0.635 mm, which is thinner than the conventional one. In this case, the rigidity of the magnetic disk is lowered, and waviness is likely to occur on the surface of the magnetic disk. FIG. 8 shows a deformed state of the magnetic disk measured by the laser measuring device. In the actual measurement, the waviness in the circumferential direction of the magnetic disk is 0.80
It has increased by about 30% for deformation of 9 mm thickness).

FIG. 9 shows a wavy magnetic disk 16a.
The state is shown in which the slider 52 is flying over the surface. The relationship between the fluctuation Δh of the flying height of the slider due to the undulation of the magnetic disk surface and the ridge height ΔS of the swell of the length L of the slider 52 relative to the running surface is Δhoc ΔSocL
It is represented by ² (where oc is a symbol indicating a proportional relationship).

According to the present embodiment described above, the slider 52
Has a smaller planar shape and its length L is 2.04 compared to the conventional one.
The thickness is reduced from 1.3 mm to 1.3 mm. for that reason,
ΔS is (1.3 / 2.04) ² = 0.41, and even if the magnetic disk is formed as thin as 0.635 mm and ΔS ′ is increased by 30%, the fluctuation of the flying height of the slider 52 Δ
h is ΔhocΔSocΔS ′ = 0.41 × 1.3 = 0.5
3, which is about 50% less than the conventional one (where oc is a symbol indicating a proportional relationship).

As described above, according to the magnetic disk apparatus of the present embodiment, even when the magnetic disk formed thinner than the conventional one is used, the fluctuation of the flying height of the slider due to the undulation of the surface of the magnetic disk, that is, the magnetic The fluctuation of the flying height of the head can be reduced, and stable magnetic recording and reproduction can be performed. Since a thin magnetic disk can be used, it is possible to reduce the thickness of the entire magnetic disk device.

According to the above magnetic disk device, 3
The spindle motor supporting a single magnetic disk is supported on both sides by a pivot, and even if the number of mounted magnetic disks is increased, the vibration of the hub can be suppressed and the tracking accuracy can be improved. In the case of the double-supported structure, it is necessary to fix the clamper 36 that fixes the magnetic disk to the hub with a plurality of screws.
Plural undulations occur on each magnetic disk. However, as described above, since the planar shape of the slider 52 is miniaturized, the flying height of the slider 52 can be stably maintained even when a plurality of undulations occur on the magnetic disk surface. . As a result, the storage capacity of the magnetic disk device can be increased by increasing the number of mounted magnetic disks and improving the tracking accuracy.

Further, according to the above magnetic disk device, since the edges and corners of the slider 52 facing the magnetic disk surface are rounded, these edges or corners come into contact with the magnetic disk surface. Even in this case, the surface of the magnetic disk can be prevented from being damaged. Therefore, even if the surface of the magnetic disk is undulated or external vibration is applied due to the thinning of the magnetic disk or the structure of supporting both ends of the spindle motor pivot,
Damage to the magnetic disk surface due to contact with the slider is prevented. Therefore, it is possible to reduce the thickness of the magnetic disk and increase the storage capacity by increasing the recording density.

When the thickness of the magnetic disk is 0.635 mm and the thickness of the slider 52 is 0.3 mm as in the above embodiment, three magnetic disks are mounted and the total height H is approximately H.
It is possible to realize a 12.7 mm magnetic disk device. Similarly, when there are two magnetic disks, theoretically, a magnetic disk device having an overall height H of about 10.6 mm is used. When one magnetic disk is used, a magnetic disk device having a height H of about 8.5 mm is used. Also, if there are 6 magnetic disks, the height H is about 1
It is possible to realize a 9 mm magnetic disk device.

From the above, if the number of mounted magnetic disks is the same as the conventional one, it is possible to provide a magnetic disk device thinner than the conventional one, and if the magnetic disk device has the same height as the conventional one, the conventional magnetic disk device can be provided. It is possible to provide a magnetic disk device having a large storage capacity.

The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the present invention. For example, in the above embodiment, all the corners and edges of the slider facing the surface of the magnetic disk are rounded, but at least the corner 66a on the air inflow end side of the slider and the flat and slanted portions 62a. If the corner portion 66b located at the boundary with and is formed to be round, a sufficient effect can be obtained.

[0050]

As described above in detail, according to the present invention, it is possible to perform stable recording / reproducing without damaging the surface of the magnetic disk, and to reduce the size and the capacity of the magnetic disk apparatus. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic disk device according to an embodiment of the present invention with its top cover opened.

FIG. 2 is a vertical cross-sectional view of the magnetic disk device.

FIG. 3 is an exploded perspective view of a carry assembly and a magnetic head assembly of the magnetic disk device.

FIG. 4 is a perspective view of a carriage assembly and a magnetic head assembly of the magnetic disk device.

FIG. 5 is a perspective view showing a slider of the magnetic head assembly.

FIG. 6 is a plan view showing a positional relationship between the slider and a magnetic disk.

FIG. 7 (a) is a bottom view of the slider, FIG.
FIG. 3B is a sectional view schematically showing the relationship between the slider, the magnetic disk, and the suspension.

FIG. 8 is a diagram showing a deformed state of a magnetic disk measured by a laser measuring device.

FIG. 9 is a diagram schematically showing a flying state of a slider with respect to the surface of a magnetic disk.

[Explanation of symbols]

10 ... Housing, 16a, 16b, 16c ... Magnetic disk,
18 ... Spindle motor, 20 ... Magnetic head assembly, 2
2 ... Carriage assembly, 24 ... Voice coil motor, 28 ... Axis, 36 ... Clamper, 50 ... Suspension, 52 ... Slider, 62 ... Ski, 64 ... Magnetic head, 66a, 66b ... Corner, 66c, 66d, 66e ...
Edge.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Hata 2-9 Suehiro-cho, Ome-shi, Tokyo Stock company Toshiba Ome factory (72) Inventor Kotaro Yamamoto 2-9 Suehiro-cho, Ome-shi, Tokyo Shareholders Company Toshiba Ome Factory

Claims (5)

[Claims] 1. A magnetic disk having a radial recording density of 150 tracks / mm or less and a thickness of 0.635 mm or less, a rotating mechanism for holding and rotating the magnetic disk, and the magnetic disk. A magnetic head assembly having a magnetic head for recording and reproducing information, a carriage assembly that movably supports the magnetic head assembly with respect to the magnetic recording medium, and a carriage assembly that moves the carriage assembly. A head actuator for positioning the magnetic head at an arbitrary position on the magnetic disk, wherein the magnetic head assembly is positioned to face the surface of the magnetic disk, and the magnetic head is provided. A substantially rectangular slider, and a suspension that supports the slider and applies a predetermined load to the magnetic head,
The slider has a width of about 1 mm or less along the substantially radial direction of the magnetic disk and a length of about 1.3 mm or less along the direction substantially orthogonal to the radial direction. A magnetic disk device characterized by the above. 2. The rotating mechanism includes a pivot supported by both ends, a hub rotatably supported by the pivot and having the magnetic disk attached thereto, and a magnetic disk fixed to the hub by a plurality of screws. The magnetic disk device according to claim 1, further comprising: a clamper held on the hub. 3. The magnetic disk device according to claim 1, wherein at least one of an edge portion and a corner portion of the slider facing the surface of the magnetic disk is rounded. 4. The magnetic disk drive according to claim 1, wherein the slider is formed to have a thickness of 0.3 mm or less. 5. A magnetic disk having a radial recording density of 150 tracks / mm or less and a thickness of 0.635 mm or less, a rotating mechanism for holding and rotating the magnetic disk, and the magnetic disk. A magnetic head assembly having a magnetic head for recording / reproducing information to / from the magnetic head, a carriage assembly that movably supports the magnetic head assembly with respect to the magnetic recording medium, and the carriage assembly that is moved to move the magnetic field. A head actuator for positioning the head at an arbitrary position on the magnetic disk, wherein the magnetic head assembly is positioned to face the surface of the magnetic disk and has a substantially rectangular shape on which the magnetic head is provided. A slider having a shape, and a suspension that supports the slider and applies a predetermined load to the magnetic head,
And at least one of an edge and a corner of the slider facing the surface of the magnetic disk is rounded.