JP2005018937A - Magnetic disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic disk device in which dust in the magnetic disk device and dust adhering to the surface of magnetic disks are reduced and error faults are prevented. <P>SOLUTION: In the magnetic disk device, opening sections 201 which become air intake ports and grooves 202 which become air flow paths from the opening sections 201 in the spindle shaft direction are provided on a spindle hub 102. Moreover, opening section 203 are provided for disk spacers 207 to blow air, that flows from the opening sections 201 of the spindle hub 102 through the grooves 202, between magnetic disks 103. Filters 204 and 205 are provided on the opening sections 203 of the disk spacers 207 and the grooves 202 of the spindle hub 102 to catch dust. Projected and recessed shapes are provided on the outer peripherals of the spacers 207 to make air flow to the outer peripheral direction from the disk inner peripheral by the rotation of the disk spacers 207 so as to reduce dust inside the device and dust adhered on the disks 103. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk device having a magnetic disk medium that rotates and drives and a magnetic head that records or reproduces information on the magnetic disk medium, and is particularly effective when applied to a magnetic disk device having a dust reduction mechanism in the magnetic disk device. Technology.
[0002]
[Prior art]
According to a study by the present inventors, the following techniques can be considered for the magnetic disk device. Generally, information is recorded and reproduced in a magnetic disk device by recording and reproducing information by floating a magnetic head slider that floats with respect to a rotationally driven magnetic disk medium with a small gap. To increase the recording density of the magnetic disk device, it has become an important issue to reduce the flying height of the magnetic head slider as much as possible.
[0003]
For example, when dust is caught between the head and the disk at the time of recording and reproduction, a phenomenon that dust is embedded in the disk occurs, and an error failure such as loss of magnetic recording information occurs. Alternatively, if the dust is not embedded in the disk, the head will float while holding the dust and the magnetic recording signal will not be able to be read or written, so frictional heat will be generated between the dust held by the head and the disk. This causes a thermal demagnetization erase error failure that erases recorded data on the disk.
[0004]
In order to collect these dusts, the magnetic disk device is provided with a dust collecting filter. However, due to the low flying height of the magnetic head slider, even small dust with a φ number of μm or less, which has not been a problem in the past, has become a cause of failure. Reduction of dust in the magnetic disk device is an important issue.
[0005]
There are various sources of dust. For example, particles such as Al-O and Si-C having a diameter of several μm or less used in the polishing process of each member such as a disk spacer and a spindle hub used in the magnetic disk device are included. is there. These dusts are cleaned in a cleaning process after polishing, but it is difficult to clean all particles.
[0006]
Further, dust is generated due to friction between members during assembly such as screw fastening or a sedge for fastening the carriage arm and the HGA. These dusts fall off and become scattered during operation of the magnetic disk device, enter between the head and the disk, and damage the recording / reproducing element of the magnetic head or the recording medium of the magnetic disk, resulting in an error.
[0007]
A conventional magnetic disk device is mainly provided with a filter for collecting dust in the magnetic disk device, and an air flow caused by the rotation of the disk passes through the filter to collect dust. However, the dust collected by the filter may fall off the filter due to vibration or the like and be dispersed again inside the magnetic disk device.
[0008]
In order to prevent this, for example, in Patent Document 1, a filter impregnated with an adhesive is built in the housing of the magnetic disk device, and dust once collected is prevented from falling off from the filter. A method for improving the cleanliness of the image has been proposed.
[0009]
Further, in Patent Document 2, an electrostatic filter is provided on the inner wall surface of the base plate of the magnetic disk device, thereby adsorbing dust existing in the magnetic disk device such as dust remaining during assembly and dust generated during subsequent operation. A method has been proposed.
[0010]
Further, in Patent Document 3, in order to reduce positioning error due to flutter caused by the rotation of the disk, a flow path for flowing air is formed between the spindle hub, the disk, and the disk spacer, and the inner periphery is regularly laid between the disks. A method for generating a wind flow toward the outer periphery has been proposed.
[0011]
[Patent Document 1]
Japanese Laid-Open Patent Publication No. 5-189993
[Patent Document 2]
JP-A-5-166357 [0013]
[Patent Document 3]
JP-A-10-162548 [0014]
[Problems to be solved by the invention]
By the way, as a result of examination of the above-described magnetic disk device by the present inventor, the following has been clarified. For example, the method using a filter impregnated with an adhesive as in Patent Document 1 has a problem that the efficiency of air passing through the filter is significantly reduced, and the cleanup time in the magnetic disk device is reduced. is there.
[0015]
Further, in Patent Document 2, it is possible to collect dust outside the disk among the dust remaining at the time of assembly. However, the dust dropped from the spacer or spindle hub existing inside the magnetic disk is collected in the base plate. There is a problem that it does not reach the electrostatic filter on the wall surface and falls onto the magnetic disk surface and is attracted.
[0016]
Most of the dust that falls off the spacers and spindle hubs inside the magnetic disk falls on the surface of the magnetic disk before being collected by the filter provided outside the outer edge of the magnetic disk. There is a possibility that. Further, when dust existing inside the magnetic disk device is not collected by the filter, it enters between the magnetic disks from the outer end of the magnetic disk. The dust that has entered between the magnetic disks may continue to float on the inner periphery of the magnetic disk and later adhere to the surface of the magnetic disk.
[0017]
As described above, the dust adhering to the surface of the magnetic disk is adsorbed by the lubricant and cannot be easily removed. When the magnetic head passes through the dust adsorbed on the surface of the magnetic disk, the dust is caught between the magnetic head and the magnetic disk, damaging the magnetic head and the magnetic disk, and an error occurs.
[0018]
Further, Patent Document 3 is a method for reducing positioning error due to flutter generated by the rotation of the disk, and is not a technique for reducing dust adhering to the magnetic disk surface.
[0019]
For example, using the method of Patent Document 3, it is effective to prevent dust that has fallen from the spacer or spindle hub existing on the inside of the magnetic disk, and at the same time, to prevent the intrusion of dust from the disk outer periphery. It is considered to be.
[0020]
However, even if the method of Patent Document 3 is used, air constantly passes from the inner periphery of the disk to the outer periphery on the surface of the magnetic disk. Even if it is provided at the end, there is a problem that dust that could not be collected by this filter or dust that has fallen off the filter floats in the apparatus again, falls to the surface of the magnetic disk through the flow path, and is adsorbed. .
[0021]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic disk device capable of always creating a clean air flow path on the surface of the magnetic disk and reducing dust existing inside the magnetic disk device and dust attached to the surface of the magnetic disk. It is in.
[0022]
[Means for Solving the Problems]
The present invention relates to a magnetic disk driven by a spindle motor, a magnetic head for recording / reproducing data on the magnetic disk, and the magnetic head supported by a load beam and a guide arm so as to be swingable on the magnetic disk. An actuator including a rotating shaft that rotates, a voice coil motor that rotates the actuator, a base that fixedly supports the spindle motor and the voice coil motor, and a base that covers the periphery of the magnetic disk excluding the swing range of the actuator The present invention is applied to a magnetic disk device including a shroud disposed above and a cover that covers the base so as to seal the magnetic disk or the spindle motor and forms an enclosure, and has the following characteristics.
[0023]
(1) The spindle hub is provided with an opening serving as an air intake and a groove serving as an air flow path in the spindle axial direction from the opening, and an opening is opened in the disk spacer to blow out the taken-in air between the magnetic disks. And a filter for collecting dust is provided at the opening of the disk spacer and / or the air inlet of the spindle hub.
[0024]
(2) In order to create an air flow from the inner periphery to the outer periphery of the disc by the rotation of the disc spacer, an uneven shape is provided on the outer periphery of the disc spacer.
[0025]
(3) In (1) above, as in (2) above, an uneven shape is further provided on the outer periphery of the disk spacer.
[0026]
(4) In the above (1) to (3), in order to further collect dust, an adhesive or an electrostatic filter is provided on the shroud facing the outer end of the magnetic disk.
[0027]
(5) In the above (1) to (4), in order to further collect dust floating in the magnetic disk device, a wall lower than the inner wall is provided adjacent to the inner wall of the base. A dust collection pocket (gap) is formed between the wall and an adhesive or electrostatic filter is provided on the inside.
[0028]
With such a configuration, the degree of cleanliness in the magnetic disk device is remarkably improved, and dust attached to the disk surface can be reduced. As a result, it is possible to reduce error failures and thermal demagnetization erase error failures caused by the dust being embedded in the disk, thereby improving the reliability of the magnetic disk device.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below, and each embodiment will be described with reference to the drawings.
[0030]
First, an example of the configuration of a magnetic disk device according to an embodiment to which the present invention is applied will be described with reference to FIGS. FIG. 1 shows a state in which the cover of the magnetic disk device of the present embodiment is opened, and FIG. 2 shows air flow paths in the magnetic disk device.
[0031]
A magnetic disk device 101 shown in FIG. 1 includes a magnetic disk 103 fixed to a spindle hub 102, a magnetic head 104 disposed on the magnetic disk 103, a load beam 105 that supports the magnetic head 104 at one end, A guide arm 106 that supports the other end of the load beam 105; an actuator 108 that includes a rotary shaft 107 that swingably supports the guide arm 106; a voice coil motor 109 that applies a rotational driving force to the actuator 108; A base 112 that fixedly supports the fixed shaft 110 of the spindle hub 102, the rotating shaft 107 of the actuator 108, and the magnet portion 111 of the voice coil motor 109, and a cover (FIG. Not shown in 1 and 2 in FIG. Constructed from the illustrated) as 6.
[0032]
In this magnetic disk apparatus 101, the base 112 and the cover are generally formed and manufactured by aluminum die casting, and the shroud 113 is integrally cast with the base 112. A filter 114 for collecting dust is installed in the base 112.
[0033]
As shown in FIG. 2, a plurality of openings 201 serving as air intakes are provided at the bottom of the spindle hub 102, and grooves 202 serving as air flow paths are provided from the openings 201 in the spindle axial direction so that the intake air can be collected. In order to blow out between the magnetic disks 103, a plurality of openings 203 are provided in the disk spacer 207. A clamp 208 for fixing the magnetic disk 103 is provided on the spindle hub 102.
[0034]
In this state, as shown in FIG. 2, the air flow path 209 takes in air from the opening 201 of the spindle hub 102, passes through the groove 202 of the air flow path, and passes from the opening 203 of the disk spacer 207 to the magnetic disk 103. It becomes a path that is blown in between and returns to the opening 201 of the spindle hub 102.
[0035]
Further, a filter 204 for collecting dust is provided in the opening 203 of the disk spacer 207, and a filter 205 for collecting dust is provided in the opening 201 at the bottom of the spindle hub 102. The dust collecting filter 204 provided in the opening 203 of the disk spacer 207 and the dust collecting filter 205 provided in the opening 201 at the bottom of the spindle hub 102 may be provided in either one.
[0036]
As a result, the dust that has fallen off from the disk spacer 207 and the spindle hub 102 existing inside the magnetic disk 103 does not immediately adhere to the surface of the magnetic disk 103 by the air flow path 209, and is constantly in the outer circumferential direction of the magnetic disk 103. To be skipped. At the same time, the intrusion of dust existing on the outer periphery of the magnetic disk 103 is prevented.
[0037]
Dust floating in the magnetic disk device again enters the opening 201 serving as an air intake at the bottom of the spindle hub 102. However, the dust collecting filter 205 or disk spacer 207 provided in the opening 201 is used. It is possible to prevent the dust from being collected by the dust collecting filter 204 provided in the opening 203 and passing through the surface of the magnetic disk 103 again. As a result, the adhesion of dust to the surface of the magnetic disk 103 can be greatly reduced, and errors can be prevented.
[0038]
Next, an example of how to attach the dust collecting filter provided in the opening of the disk spacer and the dust collecting filter provided in the opening of the bottom of the spindle hub will be described with reference to FIGS. 3 and 4 show how to attach the dust collecting filter to the disk spacer, and FIG. 5 shows how to attach the dust collecting filter to the spindle hub.
[0039]
FIG. 3 ((a) shows a state where the upper part and the lower part are separated, (b) shows a state where the upper part and the lower part are combined, and (c) shows a state where a filter is inserted in the lower part). In the attachment example of the filter 204 for use, the disk spacer 207 is divided into two parts in order to provide the filter 204 for collecting dust. The disc spacer 207 divided into two parts is divided into an upper part 301 and a lower part 302, and an opening 203 is formed in each of the upper part 301 and the lower part 302. Further, a groove 303 for accommodating the rectangular dust collecting filter 204 is formed in the opening 203, and after the filter 204 is inserted, the upper portion 301 and the lower portion 302 are aligned.
[0040]
In the case of an example of attaching the dust collecting filter 204 to the disc spacer 207 shown in FIG. 4 ((a) shows a state where the disc spacer and the dust collecting filter are separated, and (b) shows a cross section thereof). The disk spacer 207 is provided with an opening 203, and a circular groove 401 is formed in the inner diameter portion of the disk spacer 207. A ring-shaped dust collecting filter 402 is fitted into the circular groove 401. If it is difficult to form a circular groove 401 in the inner diameter portion of the disk spacer 207, the disk spacer 207 is divided into two as described above (FIG. 3), and openings are formed above and below the disk spacer 207. The step 203 for accommodating the part 203 and the filter 204 may be formed, and the groove 401 may be formed by combining them.
[0041]
In the example of attaching the dust collecting filter 205 to the spindle hub 102 shown in FIG. 5, the dust collecting filter 205 is accommodated in the lowermost portion of the groove 202 serving as an air flow path provided in the spindle hub 102. Groove 501 is provided, dust collecting filter 205 is accommodated therein, fixing disk spacer 502 is inserted, and filter 205 is pressed.
[0042]
With the above method, dust flowing into the magnetic disk 103 from the outer end of the magnetic disk 103 can be collected, and clean air can be discharged between the magnetic disks 103.
[0043]
Next, an example of a technique for enhancing the flow of wind from the inner periphery to the outer periphery between magnetic disks will be described with reference to FIGS. 6 shows an example in which a wedge-shaped uneven shape is applied to the outer peripheral surface of the disk spacer, FIG. 7 shows an example in which a rectangular uneven shape is applied, and FIG. 8 shows an example in which an uneven shape with an edge in the rotational direction is applied. .
[0044]
As shown in FIG. 6 (before (a) is uneven, and (b) is uneven), a wedge-shaped uneven shape 601 is applied to the outer peripheral surface of the disk spacer 207, so that An air flow is generated by the rotation, and the air flow flowing from the inner periphery to the outer periphery of the magnetic disk can be strengthened.
[0045]
Further, as shown in FIG. 7, the effect is slightly inferior to the wedge shape of FIG. 6, but the effect can be obtained even if a rectangular uneven shape 701 is applied.
[0046]
Further, as shown in FIG. 8, it is needless to say that if the concave / convex shape 801 having an edge in the rotation direction of the spindle hub 102 is used, the effect is larger than the shape of FIG.
[0047]
With the above method, the dust existing between the magnetic disks is discharged from the inner periphery of the disk to the outer periphery by the air flow. However, the dust floating in the magnetic disk device again enters the bottom of the spindle hub 102 again. A sufficient effect can be obtained by collecting dust with the dust collecting filter 204 provided at the opening 203 of the disk spacer 207 and the dust collecting filter 205 provided at the opening 201 at the bottom of the spindle hub 102. However, the degree of cleanliness in the magnetic disk device can be further enhanced by applying the following structure.
[0048]
Next, an example of a structure for enhancing the cleanliness in the magnetic disk device will be described with reference to FIGS. 9 and 10 are examples in which an adhesive or an electrostatic filter is provided on the shroud, FIG. 11 is an example in which a groove and an adhesive or an electrostatic filter are provided in the shroud, and FIG. 12 is an example in which a dust collection pocket is provided. 13 shows an example in which a dust collection pocket and an adhesive or electrostatic filter are provided, and FIG. 14 shows an example in which a dust collection pocket is provided adjacent to the shroud.
[0049]
As shown in FIGS. 9 and 10 (cross section), an adhesive or electrostatic filter 901 is provided on the shroud 113 facing the outer edge of the magnetic disk. As a result, dust discharged from the magnetic disk can be immediately collected by the adhesive or the electrostatic filter 901.
[0050]
Further, as shown in FIG. 11, a groove 1301 is provided in the shroud 113 facing the outer end of the magnetic disk, and an adhesive or an electrostatic filter 1302 is provided in the groove 1301. As a result, it is possible to amplify the wind flow locally at the groove 1301 and collect the dust discharged from the magnetic disk with the adhesive or the electrostatic filter 1302.
[0051]
Also, as shown in FIG. 12, a dust collection pocket 1103 is formed in the magnetic disk device. This is because a wall 1102 lower than the inner wall 1101 is provided on the inner side of the inner wall 1101 of the base 112, and a gap between the inner wall 1101 and the wall 1102 becomes a dust collection pocket 1103. As a result, once the dust 1104 floating in the magnetic disk device enters the dust collection pocket 1103, it is not affected by the air flow generated by the rotation of the magnetic disk, so that it may float again in the magnetic disk device. The cleanliness in the magnetic disk device is further enhanced.
[0052]
Furthermore, as shown in FIG. 13, by providing an adhesive or an electrostatic filter 1201 inside the dust collection pocket 1103, the dust 1104 that has entered the dust collection pocket 1103 will float again in the magnetic disk device. Needless to say, there is an effect of preventing this. Further, as shown in FIG. 12, the dust collection pocket 1103 may be formed only on the base 112 side. However, as shown in FIG. 13, the dust collecting pocket 1103 is formed on both the base 112 and the cover 206. The effect of collecting dust can be obtained regardless of the installation direction of the apparatus.
[0053]
As shown in FIG. 14, the dust collection pocket 1103 is provided adjacent to the shroud 113 facing the magnetic disk 103, and the effect is improved. However, even if the dust collection pocket 1103 is provided on the other inner wall, the dust collection effect is obtained. There is.
[0054]
An example in which the above structure is collected and installed in a magnetic disk device is shown in FIGS. FIG. 15 shows a state in which the cover of the magnetic disk device summarizing the structure of the example of the embodiment is opened, and FIG. 16 shows a cross section of the main part of the magnetic disk device.
[0055]
Therefore, according to the magnetic disk device of the present embodiment, the dust collection filters 204 and 205 are provided in the flow path 209 through which air flows between the spindle hub 102, the magnetic disk 103, and the disk spacer 207. In order to generate a forced air flow from the inner periphery to the outer periphery between the disks 103, the outer peripheral surface of the disk spacer 207 is provided with uneven shapes 601, 701, 801, and the shroud 113 facing the outer end of the magnetic disk 103. An adhesive or electrostatic filter 901 is provided, a groove 1301 and an adhesive or electrostatic filter 1302 are provided in the shroud 113, a dust collection pocket 1103 is provided on the inner wall of the magnetic disk device, and an adhesive or static is provided in the dust collection pocket 1103. These are independent or optional, such as providing an electric filter 1201 Combined, it is possible to reduce the dust adhered to the dust and the magnetic disk 103 in the magnetic disk device.
[0056]
【The invention's effect】
According to the present invention, dust in the magnetic disk device and dust attached to the magnetic disk can be reduced, so that it is possible to reduce an error failure and a thermal demagnetization erase error failure caused by the dust being embedded in the magnetic disk. . As a result, the reliability of the magnetic disk device can be improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a state where a cover of a magnetic disk device according to an embodiment of the present invention is opened.
FIG. 2 is an explanatory diagram showing air flow paths in the magnetic disk device according to the embodiment of the present invention;
FIGS. 3A to 3C are explanatory views showing how to attach a dust collecting filter to a disk spacer in the magnetic disk apparatus according to the embodiment of the present invention. FIGS.
FIGS. 4A and 4B are explanatory views showing another method of attaching the dust collecting filter to the disk spacer in the magnetic disk device according to the embodiment of the present invention. FIGS.
FIG. 5 is an explanatory diagram showing how to attach a dust collecting filter to the spindle hub in the magnetic disk device according to the embodiment of the present invention.
FIGS. 6A and 6B are explanatory views showing an example in which a wedge-shaped uneven shape is provided on the outer peripheral surface of a disk spacer in the magnetic disk device according to the embodiment of the present invention.
FIG. 7 is an explanatory diagram showing an example in which a rectangular uneven shape is applied to the outer peripheral surface of the disk spacer in the magnetic disk device according to the embodiment of the present invention.
FIG. 8 is an explanatory diagram showing an example in which the outer peripheral surface of the disk spacer is provided with a concavo-convex shape with an edge in the rotational direction in the magnetic disk device according to the embodiment of the present invention.
FIG. 9 is an explanatory diagram showing an example in which an adhesive or an electrostatic filter is provided on the shroud facing the outer end of the magnetic disk in the magnetic disk device according to the embodiment of the present invention.
FIG. 10 is an explanatory diagram showing a cross section of the example of FIG. 9 in the magnetic disk device according to the embodiment of the invention.
FIG. 11 is an explanatory diagram showing an example in which a groove and an adhesive or an electrostatic filter are provided in a shroud facing the outer end of the magnetic disk in the magnetic disk device of one embodiment of the present invention.
FIG. 12 is an explanatory diagram showing an example in which a dust collection pocket is provided in the magnetic disk device according to the embodiment of the present invention.
FIG. 13 is an explanatory diagram showing an example in which a dust collection pocket and an adhesive or an electrostatic filter are provided in the magnetic disk device according to the embodiment of the present invention.
FIG. 14 is an explanatory diagram showing an example in which a dust collection pocket is provided adjacent to a shroud facing the outer end of the magnetic disk in the magnetic disk device of one embodiment of the present invention.
FIG. 15 is a plan view showing a state in which a cover of a magnetic disk device that summarizes the structure of the example of the embodiment is opened in the magnetic disk device according to the embodiment of the present invention;
16 is an explanatory diagram showing a cross-section of the main part of the magnetic disk device of FIG. 15 in the magnetic disk device of one embodiment of the present invention. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 101 ... Magnetic disk apparatus, 102 ... Spindle hub, 103 ... Magnetic disk, 104 ... Magnetic head, 105 ... Load beam, 106 ... Guide arm, 107 ... Rotating shaft, 108 ... Actuator, 109 ... Voice coil motor, 110 ... Fixed shaft , 111 ... magnet part, 112 ... base, 113 ... shroud, 114 ... filter, 201 ... opening, 202 ... groove, 203 ... opening, 204 ... filter, 205 ... filter, 206 ... cover, 207 ... disc spacer, 208 DESCRIPTION OF SYMBOLS Clamp, 209 ... Air flow path, 301 ... Upper part, 302 ... Lower part, 303 ... Groove, 401 ... Groove, 402 ... Filter, 501 ... Groove, 502 ... Disc spacer, 601 ... Uneven shape, 701 ... Uneven shape, 801 ... Uneven shape, 901 ... Adhesive or electrostatic filter, 1101 ... Inner wall 1102 ... Wall, 1103 ... dust collection pocket, 1104 ... dust, 1201 ... adhesive or electrostatic filter, 1301 ... groove, 1302 ... adhesive or electrostatic filter.

Claims (5)

A magnetic disk driven by a spindle motor, a magnetic head for recording / reproducing data on the magnetic disk, and a rotating shaft that supports the magnetic head by a load beam and a guide arm and swingably supports the magnetic disk An actuator including: a voice coil motor that rotates the actuator; a base that fixedly supports the spindle motor and the voice coil motor; and a periphery of the magnetic disk excluding a swing range of the actuator. A magnetic disk device comprising: a shroud disposed on the base; and a cover that constitutes an enclosure covering the base so as to seal the magnetic disk or the spindle motor,
A spindle hub for holding the magnetic disk via a disk spacer is provided with an opening serving as an air intake, and a groove serving as an air flow path from the opening to the spindle axis direction,
The disk spacer is provided with an opening for blowing air flowing through the groove from the opening of the spindle hub between the magnetic disks,
A magnetic disk drive, wherein a dust collecting filter is provided in at least one of the opening of the disk spacer and the groove of the spindle hub. A magnetic disk driven by a spindle motor, a magnetic head for recording / reproducing data on the magnetic disk, and a rotating shaft that supports the magnetic head by a load beam and a guide arm and swingably supports the magnetic disk An actuator including: a voice coil motor that rotates the actuator; a base that fixedly supports the spindle motor and the voice coil motor; and a periphery of the magnetic disk excluding a swing range of the actuator. A magnetic disk device comprising: a shroud disposed on the base; and a cover that constitutes an enclosure covering the base so as to seal the magnetic disk or the spindle motor,
The magnetic disk is characterized in that the outer periphery of a disk spacer interposed to hold the magnetic disk on a spindle hub is provided with a concavo-convex shape for creating an air flow from the disk inner periphery to the outer periphery by rotation of the disk spacer. Disk unit. The magnetic disk apparatus according to claim 1,
2. A magnetic disk device according to claim 1, wherein a concave / convex shape is provided on the outer periphery of the disk spacer to create an air flow from the inner periphery to the outer periphery of the disk by rotating the disk spacer. The magnetic disk apparatus according to claim 1, 2, or 3,
A magnetic disk device, wherein an adhesive or an electrostatic filter for collecting dust is provided on a shroud facing the outer periphery of the magnetic disk. The magnetic disk device according to claim 1, 2, 3 or 4,
A dust collection for collecting dust floating in the magnetic disk device between the inner wall and the wall by forming a wall on the base adjacent to the inner wall of the base and lower than the inner wall. Create a pocket,
A magnetic disk device, wherein an adhesive or an electrostatic filter for collecting dust is provided inside the dust collecting pocket.

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