JPH03219488A - Air cleaner for magnetic disk device, magnetic disk device, and evaluation method for magnetic disk - Google Patents

Abstract

PURPOSE:To efficiency collect dust, etc., and to improve stability in the floating of a magnetic head by providing an air cleaner consisting of a carbon filter and a dust elimination filter provided in the neighborhood of the filter between plural magnetic disks on the upstream side of the magnetic head. CONSTITUTION:The air cleaner 4 collects the dust with the dust elimination filter 5 when the air including floating dust and evaporation substance flows in from the direction of arrow head B of a container 41 by air current generated by the rotation of the magnetic disk 2, and collects the evaporation substance passing through the filter 5 with the micro porous carbon fiber of a gas filter 7. In the filter 7, possibility that fiber substance is peeled and is floated exists, however, it collects the fiber substance with the dust elimination filter 6 arranged at an air outflow side shown in arrow head C and prevents the substance flowing out to a device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an air cleaner for a magnetic disk device, a magnetic disk device to which the air cleaner is applied, and a method for evaluating the magnetic disk.

[Conventional technology]

In recent years, magnetic disk drives have tended to reduce the flying height of their magnetic heads in order to perform high-density recording in response to demands for smaller sizes and larger capacities.

The flying height of this magnetic head is, for example, 0.3 μm to 0.5 μm.
Narrowing down to μm means increasing the probability of contact between the magnetic head and the magnetic disk. In order to prevent contact between the magnetic disk and the magnetic head, it is necessary to prevent substances (for example, dust) other than the lubricant for protecting the magnetic film from entering the surface of the magnetic disk on which the magnetic head flies. Specifically, when dust gets mixed in on the surface of a magnetic disk, the dust adheres to the magnetic head, and this dust adhesion disturbs the flying posture of the magnetic head that flies aerodynamically over the magnetic disk, resulting in a reduction in flying height and levitation. The posture becomes tilted, causing the head and disk to slide or causing a head crash.

Therefore, it is necessary to prevent dust and other substances from entering the surface of the magnetic disk.

In addition, in magnetic disk drives, organic materials such as plastic and rubber products are used as sealants and damping materials, and as the temperature inside the device rises, evaporated substances from these organic materials become saturated vapor inside the magnetic disk drive. The pressure is mixed into the internal air. Therefore, in addition to dust generated due to contact between the magnetic head and the magnetic disk, the evaporated substances are present in the magnetic disk device. This evaporated substance adheres as a liquid to the slider surface of the magnetic head due to a temperature drop caused by a sudden pressure drop at the trailing edge of the slider of the magnetic head when the magnetic disk is driven to rotate. For this reason, like the dust mentioned above, evaporated substances also disturb the flying posture of the magnetic head, causing a decrease in flying height and tilting of the flying posture, which can lead to damage to the head and disk due to sliding between the head and disk or head crash. was there.

Generally, magnetic disk drives have an air purifier that collects dust and the like disposed in an air circulation path provided inside or outside the magnetic disk drive in order to prevent problems caused by the dust and the like.

As described in Japanese Patent Publication No. 58-16260, a conventional air purifier for a magnetic disk device uses a moisture absorbent (silica gel) and a particulate adsorbent (activated carbon particles) and is installed outside the device. By placing the air purifier in the circulation path of the room and forcing air circulation with a blower, or by placing the air purifier in contact with the internal air,
A device that collects moisture and oil and fat components in the air inside the device, or a magnetic device that arranges activated carbon particles in the air circulation path in the spindle hub as described in Japanese Patent Application Laid-Open No. 148691/1982. Organic matter generated from lubricating oil scattered from disks, magnetic sealants such as spindle bearings, and plastic parts in equipment.

Some are known to collect inorganic substances.

On the other hand, for magnetic disk drives, it is important to verify the sliding resistance of the magnetic disk and magnetic head against the above-mentioned dust, etc., and a method for evaluating this resistance is disclosed in Japanese Patent Application Laid-Open No. 6.3-2045.
As described in Publication No. 12, there is a known method for evaluating the sliding properties of a magnetic disk against dust by inspecting the head read signal of a contaminated magnetic disk to which dust has adhered due to rotation in the atmosphere for a predetermined period of time. ing.

[Problem to be solved by the invention]

The magnetic disk drive described in Japanese Patent Publication No. 58-16260 has an air purifier using a moisture absorbent and a particulate adsorbent in the external air circulation path using a blower. The problem is that magnetic disk drives that have an air purifier that comes into contact with the internal air cannot collect enough dust because of the mere air contact. there were.

Furthermore, a magnetic disk drive having an air purifier that collects organic and inorganic substances by disposing activated carbon particles in the air circulation path in the spindle hub described in Japanese Patent Application Laid-Open No. 61-148691 is Since the air purifier is disposed within the spindle hub that forms the air purifier, there is a problem in that air circulation is obstructed by the air resistance of the air purifier's pipes, reducing the efficiency of collecting floating dust and the like. It is also possible to make the activated carbon particles in the air purifier coarser and denser in order to reduce the air resistance of the pipes, but in this case, there is a problem that agitation and contact between the particles may become a source of dust. There was a risk of inviting

On the other hand, the conventional strength evaluation method for verifying sliding resistance has a problem in that although it can evaluate the strength against dust, it cannot evaluate the strength due to the evaporated substances generated inside the device.

A first object of the present invention is to provide an air cleaner for a magnetic disk device that can efficiently collect dust and the like even in an internal circulation type air cleaner.

A second object of the present invention is to provide a magnetic disk drive having an internal circulation type air cleaner that can efficiently collect dust and the like.

A third object of the present invention is to provide a magnetic disk drive having an internal circulation type air cleaner with low conduit air resistance and capable of efficiently collecting dust and the like.

A fourth object of the present invention is to provide a magnetic disk evaluation method that can evaluate the sliding strength of a magnetic disk and magnetic head due to dust and evaporated substances.

[Means to solve the problem]

In order to achieve the above object, the air cleaner for a magnetic disk drive of the present invention includes a container disposed in the air flow passage through which air flows, and a carbon-based filter disposed in the air flow passage of the container. and a dust removal filter disposed on at least one side of the air inflow or outflow side of the carbon filter in the container.

In order to achieve the above object, a first magnetic disk device of the present invention uses an air purifier including a carbon-based filter and a dust removal filter disposed near the carbon-based filter to control the air flow. In contrast, it is characterized by being provided on the upstream side of the magnetic head and between a plurality of magnetic disks.

Furthermore, in order to achieve the above object, a second magnetic disk device of the present invention includes a carbon-based filter having a pipe-like structure or a honeycomb-like structure; An air purifier comprising a dust removal filter arranged in an air purifier is disposed in an air flow path in an HDA container housing a high-speed rotating magnetic disk and a magnetic head aerodynamically floating above the magnetic disk. It is characterized by

In order to achieve the above object, the present invention provides a magnetic disk strength evaluation method in which a magnetic disk device is placed in an HDA container housing a high-speed rotating magnetic disk and a magnetic head aerodynamically floating above the magnetic disk. The method is characterized in that an evaporative substance is supplied by heating an organic material used in the magnetic head, and collisions and adhesion of the evaporative substance to the magnetic head are detected, and damage to the magnetic disk is observed.

[Effect]

In the air cleaner for a magnetic disk device of the present invention, when the air inside the device flows through the container, the carbon-based filter collects evaporated substances in the circulating air, and the dust removal filter collects dust and dirt in the circulating air. By collecting the fibers generated from the carbon-based filter, it is possible to collect the evaporated substances generated inside the self-circulation type device.

Front Arrangement The first magnetic disk device of the present invention has an air purifier including a carbon-based filter and the dust removal filter provided between a plurality of magnetic disks on the upstream side of the magnetic head with respect to the air flow. By collecting dust, evaporated substances, etc., it is possible to collect evaporated substances, etc. immediately before colliding with the magnetic head, and at the same time, improve the flying stability of the magnetic head by rectifying the air flow toward the magnetic head. I can do it.

The second magnetic disk device of the present invention uses a carbon-based filter having a pipe-like structure or a honeycomb-like structure in the air purifier, so that the pipe air resistance can be extremely small, and the air flow inside the HDA can be reduced. can be circulated at high speed. Therefore, it becomes possible to significantly improve the efficiency of collecting floating dust and the like. Furthermore, since activated carbon particles are not used as a filter, there is no possibility of dust generation from the activated carbon itself.

The strength evaluation method for a magnetic disk according to the present invention includes heating an organic material used in a magnetic disk device to supply an evaporative substance to an HDA container housing a magnetic disk and a magnetic head, and supplying an evaporative substance to the magnetic head. By detecting the collision and adhesion of the magnetic disk and observing the state of damage to the magnetic disk, it is possible to evaluate the sliding resistance of the magnetic disk against evaporated substances.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. First, an air cleaner for a magnetic disk device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The air purifier 4 according to this embodiment includes a dust removal filter 5 disposed on the inflow air side (indicated by arrow B) of a container 41 having a cylindrical cross-sectional shape as shown in FIG. A gas filter 7, which corresponds to a carbon fiber filter made of fine porous carbon fibers, is arranged between the filters 5 and 6.

This air purifier consists of a magnetic disk 2 which rotates at high speed as shown in FIG. A magnetic head 3 aerodynamically floating above the magnetic disk 2. In a magnetic disk device in which an actuator 10 for moving the magnetic head 3 with a magnetic disk 2 is hermetically stored in an HDA container 1, air flows in six directions of arrows from the inner circumference to the outer circumference of the disk due to high-speed rotation of the magnetic disk 2. The air purifier 4 is disposed in the flow path, and the air purifier 4 is configured so that the air flow that self-circulates within the device flows through the air purifier 4.

The air cleaner 4 configured in this manner is configured such that when air containing floating dust and evaporated substances flows into the container 41 from the direction of arrow B due to the air flow generated by the rotation of the magnetic disk 2,
First, dust is collected by the dust removal filter 5, and the evaporated substances that have passed through the filter 5 are collected by the fine porous carbon fibers of the gas filter 7. Also gas filter 7
Because of the carbon fibers, there is a possibility that fiber substances may peel off and float, but this air purifier 4 collects these fiber substances with the dust removal filter 6 placed on the air outflow side shown by arrow C, and removes them from the inside of the device. This prevents it from leaking.

Therefore, in the air purifier according to this embodiment, the self-circulating air flow passes through the self-circulating magnetic disk device, so that dust in the air is collected by the dust removal filter 5, and evaporated substances are removed from the gas. Dust and evaporated substances can be efficiently collected in a self-circulation type magnetic disk device by collecting the fibers using the filter and further confining the fibers generated from the gas filter 12-tuff using the filters 5 and 6. Note that either one of the dust removal filters 5 and 6 may be used.

Next, a magnetic disk drive having an air purifier according to a second embodiment of the present invention will be described with reference to FIGS. 3 to 6.

The magnetic disk device according to this embodiment is an application example of the above-mentioned air purifier, and as shown in FIG. 3, a plurality of magnetic disks 2. An actuator 10 for moving the magnetic head 3. A spoiler 8 is provided on the magnetic disk 2 on the upstream side of the magnetic head 3, and an HDA container 1 that hermetically houses these mechanisms is provided.

The spoiler 8 constitutes a plurality of air purifiers inserted between the plurality of magnetic disks 2, as shown in FIG. 4, and the air purifiers are shown in FIG. 5, which is a partially enlarged view of the spoiler 8. As shown in the figure, it has a structure in which a gas filter tough 0 made of fine porous carbon fibers that collects evaporated substances in the air is sandwiched between two dust removal filters 50 and bent into a dogleg shape. .

The spoiler 8 is disposed at a front position 2 where the airflow generated by the high-speed rotation of the magnetic disk 2 hits the magnetic head 3, that is, on the upstream side of the airflow.

Therefore, in the magnetic disk device according to this embodiment, when the airflow generated by rotating the magnetic disk 20 passes through the filters 50 and 7o of the bent spoiler 8, as shown in FIG. 11 is collected by the filter 50 on the upstream side, the evaporated substance 12 is collected by the gas filter 70, and the fibers that may be generated from the filter 70 are collected by the filter 50 on the downstream side. It is possible to prevent the magnetic head 3 from sliding due to dust and evaporated substances in the internal air.

Further, the magnetic disk device according to this embodiment has a magnetic head 3.
The flying stability of the magnetic head 3 can also be improved by rectifying and decelerating the air colliding with the magnetic head 3 by the spoiler 8 provided on the upstream side of the magnetic head.

Next, a magnetic disk drive having an air purifier according to a third embodiment of the present invention will be described with reference to FIGS. 7 to 9.

In the magnetic disk drive of this embodiment, the HDA container 1 is partitioned into two chambers by a partition plate 21, as shown in FIG. In the first room there is a magnetic disk 2
A part of a magnetic herad arm 22 having a magnetic head 3 and a magnetic head 8 at its tip is mounted. The second room includes a part of the magnetic head arm 22, a carriage 24 on which the magnetic head arm 22 is mounted, a guide rail 23 for a carriage bearing 27 attached to the carriage 24, and a rail that supports the guide rail 23. Housing 28 and coil 25 that constitutes a voice coil motor
Also mounted are a magnet 26, a voice coil motor mounting member 29 that supports the voice coil motor, an air purifier 15-30 consisting of dust removal filters 30a, 80c, and a paper-like activated carbon filter 30b.

The partition plate 21 that partitions the first room and the second room is provided with an entrance/exit window for the magnetic head 3 at the mounting position of the magnetic helad arm 22 and the magnetic head 3, and an entrance/exit window for the magnetic head 3 is provided at the mounting position of the magnetic head 3. A window for an air outlet is provided on the dust removal filter 30a side. Here, the vicinity of the air outlet of the dust removal filter 30a in the first room is an area where the air pressure is low due to the rotation of the magnetic disk 2. As a result, two magnetic disks were placed between the two rooms.
The rotation of causes an air flow as shown by the arrow.

The air purifier 30 also includes a dust removal filter 30a.
, 30c and a paper-like activated carbon filter 30b having a pipe-like or honeycomb-like structure. Since the paper-like activated carbon filter 30b has a pipe-like structure or a honeycomb-like structure, this air purifier 3
The pipe air resistance of 0 is a very small value.

Figures 8 and 9 show the air purifier 16 shown in Figure 7.
- It is an explanatory view showing 30 specific examples. FIG. 8 shows an example in which the paper-like activated carbon filter 30b has a pipe-like structure, and FIG. 9 shows an example in which the paper-like activated carbon filter 3ob has a honeycomb-like structure. According to the air purifier 30 shown in FIGS. 8 and 9, since the paper-like activated carbon filter 3ob has a pipe-like structure or a honeycomb-like structure, the pipe air resistance is small.
Furthermore, since activated carbon particles are not used as a filter, there is little possibility that dust will be generated from the activated carbon itself, making it possible to provide an air purifier with high dust collection efficiency.

Furthermore, as the air purifier 30, a dust removal filter 3
It is only necessary to include at least one of 0a and 30b,
When only the dust removal filter 30a on the downstream side of the air flow is provided, even if dust is generated from the paper-like activated carbon filter 30b, it is effective in removing this dust.

Next, the embodiment shown in FIG. 7 will be described in detail.

In the magnetic disk drive of this embodiment, dust and gas that are thought to be generated from the guide rail 23, carriage bearing 27, etc. due to the seek operation of the carriage 24 pass through the entrance/exit window of the magnetic head 3 of the partition plate 21, and enter the second room. It is undesirable for the air flow to flow into the first chamber, and it is preferable that the air flow flow into the second chamber after all dust and the like has passed through the air purifier 30 and been removed. Therefore, it is necessary that the air flowing from the first room to the second room through the entrance/exit window of the magnetic head 3 of the partition plate 21 pass through the air purifier 30 without flowing back. be. For this purpose, the air must flow smoothly through the air purifier 30, and for this reason, it is desirable that the air purifier 30 has as low a pressure drop as possible at the same flow rate in terms of the air flow-pressure drop characteristics of the air purifier 30. Therefore, we adopted a paper-like vibrator structure or a paper-like honeycomb structure that can reduce pressure loss.

In addition, when activated carbon particles are used, there is a risk that the activated carbon will rub against each other due to vibration etc. and generate a large amount of dust, but in the case of activated carbon with a pipe-like or honeycomb-like structure, there will be no rubbing against each other. , the possibility of dust generation is very small.

As is clear from the above description, according to the third embodiment, the packing, adhesive,
The paper-like activated carbon filter 3ob removes gaseous components generated from plastic molded products and the like, thereby stabilizing the narrow floating of the magnetic head 3 above the magnetic disk 2.

Next, an embodiment of an evaluation apparatus to which the proof stress evaluation method according to the present invention is applied will be described with reference to FIGS. 10 to 13.

As shown in FIG. 10, the sliding resistance evaluation device according to this embodiment includes a heating container 35 having an organic material 40 used in a magnetic disk device, and a heating container 35 that is heated to approximately 808C to 130C. A heater 36 that generates evaporative substances such as gas mist from the organic material 4o, a gas collection plate 34 that cools and collects the evaporative substances with the cooler 33, and a piezoelectric element that takes in the cooled evaporative substances. An HDA container 1 provided with a mounted magnetic head 3 and a viewing window 41 for observing the contact state between the magnetic head 3 and the magnetic disk 2;
A vacuum pump 37 for discharging the internal air of the container 1 to the outside, an amplifier 38 and an oscilloscope 39 for monitoring the piezoelectric element output of the magnetic head 3, and the magnetic head 3 through the viewing window 41 of the HDA container 1. and an optical microscope 31 and a video camera 32 for monitoring the magnetic disk 2.

Although not shown, the HDA container 1 has a magnetic head 3.
The optical microscope 31 has an unloading mechanism (not shown).
The magnetic head 3 is configured to be unloaded during observation. Although not shown, a gas dust collector and a gas dust concentration detector are connected to the exhaust side of the vacuum pump 37 to detect the concentration of gas dust in the HDA container 1.

The evaluation device configured in this manner heats the organic material 40 with the heating container 25 while rotating the magnetic disk 2 in the HDA container 1 at high speed, and generates an evaporative substance (gas, mist). This evaporated material is cooled by a cooler 33 and divided into those that adhere to the gas collection plate 34 and those that are guided to the HDA container 1.
suspended in the air.

20- When this floating evaporated substance hits the magnetic head 2 on the airflow circulating in the HDA container 1 due to the high-speed rotation of the magnetic disk 2, this collision causes a change in the output of the piezoelectric element mounted on the head 2. It is displayed on an oscilloscope 39 via an amplifier 38.

Disturbances in the flying posture of the magnetic head 2 caused by adhesion of evaporated substances to the magnetic head 3 are observed by an optical microscope 31 through a visible window 41 opened in the HDA container 1, and this process is recorded by a video camera 32.

Further, the magnetic disk 2 after a failure such as sliding can be observed using an optical microscope 31 while the magnetic head 3 is lifted from the surface of the magnetic disk 2 by the magnetic head unloading mechanism.

As described above, the sliding resistance evaluation method according to this embodiment involves mixing an evaporative substance obtained by heating the organic material 40 into the HDA container 1 containing the magnetic disk to be evaluated, and contacting the evaporative substance with the magnetic head 3. By observing the state with an oscilloscope 39 and the state of the magnetic head 3 and magnetic disk 2 with an optical microscope 31, the HDA container 1 (
It is possible to evaluate the sliding resistance of the magnetic disk and magnetic head due to the organic material generated inside the magnetic disk device.

In the above embodiment, an example was explained in which the evaporated material obtained by heating the organic material 40 is discharged to the outside of the apparatus, but the present invention is not limited to this.
It may be circulated within.

In this case, the sliding resistance evaluation device is a heater 36 as shown in FIG. Heating container 35 containing organic material 4o. Cooler 33 HDA container 1 with gas collection plate 34 attached. A vacuum pump 37 is provided, and the discharge side of the vacuum pump 37 is configured to be guided into the inside of the heating container 35.

The evaluation device according to this embodiment circulates the evaporated substance in the HDA container 1 to the heating container 35 and supplies it again to the HDA container 1, so that the gas concentration is kept constant by maintaining the temperature in the heating container 35. Sliding resistance can be evaluated in the maintained state.

Furthermore, FIGS. 12 and 13 are diagrams showing evaluation devices according to other embodiments of the present invention, respectively, and
It has an integrated structure including a DA container, a heating container, etc.

The evaluation apparatus shown in FIG. 12 includes a heating container 45 containing an organic material 40 and an HDA container 100 having a magnetic disk 2 arranged vertically in the upper part of the heating container 25.
This device has an integrated structure through which the evaporated substances generated by heating the organic material 40 are transferred to the HDA container 10.
By supplying directly into the 0, it is possible to miniaturize the device and perform accelerated tests.

Further, FIG. 13 shows an HDA container 101 having a horizontally arranged magnetic disk 2 inserted into a heating container 46 through a through hole 41.
By supplying the evaporated substances generated by this device directly into the HDA container 101, the device can be downsized and accelerated tests can be performed.

Each of the embodiments shown in FIGS. 12 and 13 is an evaluation device compatible with magnetic disk devices having different arrangements of magnetic disks. Also in the embodiments shown in FIG. 11 and subsequent figures, there is a magnetic head unloading mechanism, a gas dust concentration detection mechanism, an optical microscope 31° video camera 32. It goes without saying that an oscilloscope 39 or the like may be provided.

〔Effect of the invention〕

As described above, in the air cleaner for a magnetic disk drive according to the present invention, when the air inside the device flows through the cylindrical container, the carbon-based filter collects evaporated substances in the circulating air. By collecting dust in the circulating air and fibers generated from the carbon-based filter, the dust removing filter can efficiently collect evaporated substances and dust inside the self-circulation type device.

Furthermore, the first magnetic disk device of the present invention provides an air cleaner including a carbon filter and a dust removal filter provided near the carbon filter at a plurality of locations upstream of the magnetic head with respect to the air flow. By providing it between the magnetic disks, it is possible to collect the evaporated material just before it collides with the magnetic disk, and it is also possible to improve the flying stability of the magnetic head by rectifying the airflow toward the magnetic head. .

Furthermore, since the second magnetic disk device of the present invention uses a carbon-based filter having a pipe-like structure or a honeycomb-like structure in the air purifier, the pipe air resistance can be extremely small, and the air inside the HDA can be It becomes possible to circulate the flow at high speed. Therefore, it becomes possible to significantly improve the efficiency of collecting floating dust and the like. Furthermore, since activated carbon particles are not used as a filter, it is possible to eliminate the possibility of dust generation from the activated carbon itself.

Further, in the magnetic disk proof stress evaluation method of the present invention, an evaporative substance is supplied by heating an organic material used in a magnetic disk device to an HDA container housing a magnetic disk and a magnetic head, and the evaporation substance is supplied to the magnetic head. By detecting the collision and adhesion of substances and observing the state of damage to the magnetic disk, it is possible to evaluate the sliding resistance of the magnetic disk against evaporated substances.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a magnetic disk device equipped with an air purifier according to an embodiment of the present invention, FIG. 2 is a sectional view of an air purifier applied to the device shown in FIG. 1, and FIG. 4 is a partial perspective view for explaining the arrangement of a spoiler applied to the present magnetic disk device; FIG. 5 is a partially enlarged cross-sectional view of the spoiler; FIG. FIG. 6 is a diagram for explaining the state of collection of evaporated substances and dust by the spoiler, FIG. 7 is a diagram showing a magnetic disk device equipped with an air cleaner according to an embodiment of the present invention, FIGS. FIG. 9 is an explanatory diagram showing an example of an air purifier applied to the device shown in FIG. 7, FIG. 10 is a diagram showing an example of a strength evaluation device to which the strength evaluation method according to the present invention is applied, and FIG. 11 13 to 13 are diagrams for explaining a proof stress evaluation device according to another embodiment to which the evaluation method according to the present invention is applied. 1: HDA container, 2: magnetic disk, 3: magnetic head,
4: Air purifier, 5 and 6: Dust removal filter, 7: Gas filter, 8 Varnish boiler, 11: Dust, 10: Actuator, 12: Evaporated substance, 22: Magnetic helad arm,
23 Guide rail, 24: Carriage, 25: Coil, 26: Magnet, 27: Carriage bearing, 2
8; rail housing, 29; voice coil motor mounting member, 30: air purifier 30a, 30c: dust removal filter, 30b = paper activated carbon filter, 31: optical microscope, 32: video camera, 33: cooler, 34: Gas collector, 36: Heater, 35: Heating container, 37: Vacuum pump, 38: Amplifier, 39 Nioscilloscope, 40: Organic material, 41: Through hole, 45: Heating container, 50: Dust removal filter, 70 :Gas filter, 100 and 101: HD
A container.

Claims (4)

[Claims] (1) An air purifier for a magnetic disk device that is placed in an air flow path generated by high-speed rotation of a magnetic disk, which includes a container that is placed in the air flow path and through which air circulates, and a container that is placed in the air flow path and through which air circulates; An air system for a magnetic disk drive comprising: a carbon-based filter disposed in an air flow path; and a dust removal filter disposed on at least one of the air inflow and outflow sides of the carbon-based filter in the container. Purifier. (2) A plurality of magnetic disks that generate airflow through high-speed rotation, a magnetic head that floats aerodynamically over the magnetic disks, an actuator that moves the magnetic heads over the magnetic disks, and a hermetically sealed arrangement of these. A magnetic disk drive including an HDA container for storing an HDA and an air purifier disposed in an air flow path in the HDA container, a carbon-based filter, a dust removal filter disposed near the carbon-based filter, 1. A magnetic disk drive characterized in that an air purifier comprising: is provided between a plurality of magnetic disks on the upstream side of a magnetic head with respect to an air flow. (3) A plurality of magnetic disks that generate airflow through high-speed rotation, a magnetic head that aerodynamically floats above the magnetic disks, an actuator that moves the magnetic heads above the magnetic disks, and a hermetically sealed arrangement of these. In a magnetic disk drive including an HDA container for storing an HDA, and an air purifier disposed in an air flow path in the HDA container, the air purifier includes a carbon-based filter having a pipe-like structure or a honeycomb-like structure; A magnetic disk drive comprising a dust removal filter disposed on at least one of the air inflow and air outflow sides of a carbon-based filter. (4) A magnetic disk resistance evaluation method for evaluating the sliding properties of a magnetic disk rotating at high speed in an HDA container against evaporated substances, the method comprising: a magnetic disk rotating at high speed; and a magnetic disk aerodynamically floating above the magnetic disk. An organic material used in a magnetic disk drive is heated to supply an evaporated substance to an HDA container housing a head, and collisions and adhesion of the evaporated substance to the magnetic head are detected, and damage to the magnetic disk is observed. A magnetic disk evaluation method characterized by: