JP5792427B2 - Disk array device - Google Patents

Description

  The present invention relates to a disk array device including a storage device such as an HDD (hard disk drive) and a control device that controls the storage device.

  Conventionally, a disk array device has been used as an external storage device of a computer system. This disk array device usually has a structure in which an HDD, a control device for controlling the HDD, a power source, a battery, a fan, and the like are housed in a casing. In recent years, disk array devices have been mounted with higher density and higher performance, and in association with this, cooling performance is also required to cope with temperature rise due to increased heat generation of component parts and performance degradation due thereto. ing.

  Such a disk array device includes, for example, a rack-shaped basic frame and a plurality of disk boxes that can be inserted and removed in the depth direction of the basic frame, and the disk box is a sealed structure, and the bottom surface of the disk box In addition, a disk array apparatus has been introduced that can mount a large number of HDDs by arranging a plurality of HDDs vertically and horizontally, and can improve the cooling effect and the low noise effect. (For example, refer to Patent Document 1).

  In addition, it has a basic housing in which the front and rear surfaces are open and the backboard is fixed in the middle of the interior, a plurality of HDDs are disposed on the front side of the backboard, and the HDD is on the rear side of the backboard. A control device is provided to control the HDD, and the HDD is cooled by outside air sucked from an opening formed in the front surface of the basic casing, and the control device is cooled by outside air passing through the opening hole of the backboard. A disk array device is introduced. (For example, refer to Patent Document 2).

  In addition, a magnetic disk module having a plurality of magnetic disk drives and a back panel disposed on the back surface of the plurality of magnetic disk drives and provided with an opening through which air is passed is arranged back to back on both sides of the front and rear. A fan is provided at the top of the rack containing the magnetic disk module, and the air heated by the magnetic disk module is discharged from the opening of the back panel, and between the back surfaces of the magnetic disk modules arranged in alignment with the back surface. A disk array device that uses a space as a duct to be discharged by the fan has also been introduced. (For example, refer to Patent Document 3).

  Also, a cooling device that introduces cooling air generated by a fan to a heat generating component provided on a substrate via a duct member and cools the heat generating component has been introduced. In this cooling device, the duct member is disposed on the substrate, and the heat generating component is disposed inside, and the cooling air flowing inside is set to be larger than the outside. The first air guide part and the second air guide part that connects the first air guide member and the fan ensure that the heat generating part is secured regardless of the position of the heat generating part. To be able to cool down. (For example, refer to Patent Document 4).

JP 2007-66480 A JP 2008-251067 A JP 2008-251100 A WO2006 / 098020

  However, the disk array device described in Patent Document 1 cools a disk drive by an air cooling system, a refrigeration cycle system, and a liquid cooling system by making a disk box a sealed structure. Unlike a disk array apparatus to be used, it is necessary to equip a heat exchanger, a heat transport medium, and the like, which may complicate the apparatus, increase the price of the apparatus, and increase the running cost.

  Further, the disk array device described in Patent Document 2 has a plurality of HDDs arranged on the front side of the backboard, and a control device for controlling the HDDs on the rear side of the backboard. Therefore, high-temperature outside air after cooling the HDD is supplied to the control device, and sufficient cooling cannot be performed.

  Here, HDDs have size standards such as 3.5-inch HDDs and 2.5-inch HDDs, and a 19-inch rack is generally used as a rack for installing these. Mounting is limited. That is, in a standard disk array device using a 19-inch rack, a 3.5-inch HDD has a basic thickness of 2U size (the EIA standard has a thickness of 1.75 inches (44.45 mm)). If it is doubled, it will be called 2U, and if it is doubled, it will be called 3U). If it is 3U size, 15HDD will be the maximum number. Therefore, when the disk array device is installed in a rack that is generally used, it is more difficult to achieve higher density mounting of HDDs.

  Further, as in the disk array device described in Patent Document 2, in the configuration in which the HDD is disposed on the front surface of the device and the control device is disposed on the back side of the HDD, a battery is used for cache backup of the control device. If the battery is mounted, low-temperature outside air cannot be sent to the battery, and there is a possibility that the capacity is lowered or the temperature becomes too high due to the temperature rise of the battery. Therefore, in order to send low temperature outside air, it is conceivable to maintain the environmental temperature of the place where the disk array device is installed at 30 ° C. or less. However, it can be installed only in a place where the environmental temperature can be maintained, which is practical. Absent.

  In addition, in the case of a disk array device in which an HDD is arranged on the front side of the device and a control device is arranged on the back side of the HDD, switches for operation and LED display devices are separated from the control device. Will be established. Therefore, when installing the switch, display device, etc. on the front side of the apparatus, it is considered that a film substrate or the like for connecting them to the control apparatus is required, and there is a concern that the price of the disk array apparatus will increase. The

  Further, since the disk array device described in Patent Document 3 has the magnetic disk modules back to back, the number of mounted magnetic disk drives can be increased. However, the air heated by the magnetic disk module is used as the magnetic disk module. Since it is exhausted from the back of the module, the air flow is limited to upward exhaust. Therefore, a dedicated rack capable of exhausting upward is required.

  Furthermore, the cooling device described in Patent Document 4 is a device that cools the heat-generating component by guiding cooling air to the heat-generating component provided on the substrate through the duct member. No consideration is given to the achievement of the realization and the efficient cooling of the HDD and the control device mounted with high density.

  The present invention has been made in view of such circumstances, and even when mounted on a rack that is generally used, a storage device such as an HDD can be mounted at a high density, and the storage device can be installed inside the housing. It is an object of the present invention to provide a disk array device capable of efficiently cooling a storage device and a control device provided.

In order to achieve this object, the present invention includes a housing having a front surface formed with an air inlet,
A storage device module having a plurality of storage devices arranged on the front surface side in the housing and arranged from the front surface side to the back side, and disposed on the back side of the storage device module in the housing. A side wall that blocks passage of outside air from the front surface side to the back side of the storage device module placement region toward the storage device module placement region. Forming an outside air guiding portion that is defined by the side wall and guides a part of the outside air taken in from the intake port to the control device without touching the storage device, and from the intake port to the outside air guiding portion A disk array device is provided in which the control device is provided on a straight line that passes through the above .

  The disk array device having this configuration is defined by at least one of a side wall formed from the front side to the back side of the housing and a side wall formed from the front side to the back side of the storage device module. Since it has an outside air guiding part for guiding a part of the outside air introduced into the casing from the intake port toward the back side from the front side, the outside air passing through the outside air guiding part is stored in the memory. It is guided toward the back side without contacting the device module, and reaches the control device arranged on the back side with respect to the storage device module. That is, the outside air that passes through the outside air guiding unit is supplied to the control device in a state where there is almost no heat exchange with the high-temperature storage device module and the temperature before being introduced into the housing is maintained. . Further, of the outside air introduced from the intake port, the outside air that does not pass through the outside air guiding portion reaches the storage device module, and can cool the storage device module. Therefore, the storage device module and the control device can be cooled by low-temperature outside air, and the cooling efficiency can be improved.

  In addition, since the storage devices are arranged from the front side to the back side, the number of storage devices can be easily increased as long as the entire depth of the disk array device allows, and high-density mounting is possible. It can also be achieved.

  Further, as one aspect of the disk array device according to the present invention, there are a plurality of the storage device modules, and the plurality of storage device modules are arranged in parallel in a direction perpendicular to the direction from the front side to the back side. Thus, the outside air guiding section can be formed between the storage device module and a storage device module arranged in parallel with the storage device module. In the case of this configuration, the outside air guiding portion may be defined by side walls formed from the front side to the back side of the respective storage device modules and arranged to face each other, and between the respective storage device modules. In addition, side walls that are opposed to each other with a space from the front side toward the back side may be disposed in the casing and defined by these side walls.

As another aspect of the disk array device according to the present invention, the outside air guiding portion is formed at a central portion in the width direction of the housing, and further defines the storage device module and the outer shape of the housing. It is also included that another outside air guiding part is formed between the side wall and the side wall. In the case of this configuration, the outside air guiding portion is formed from the front side to the back side of the storage device module and is opposed to the side wall that defines the outer shape of the housing, and defines the outer shape of the housing. A side wall formed along the side wall of the storage device module may be disposed in the housing, and may be defined by the side wall and a side wall that defines the outer shape of the housing.

  In the disk array device according to the present invention, an insertion / removal port in which the storage device can be arranged and taken out in the housing can be formed on the side wall that defines the outer shape of the housing. With this configuration, in addition to the advantages described above, even after the disk array device is installed at a desired location, the storage device can be easily removed or disposed from the housing via the insertion / removal port. can do.

  In the disk array device according to the present invention, the housing can be configured such that the insertion / removal port can be shielded by the fixing member when the housing is attached to a fixing member that fixes the housing. With this configuration, the insertion / removal port can be blocked by the fixing member, so that in addition to the advantages, the storage device can be prevented from being inadvertently inserted / removed during operation of the disk array device. Can do.

  The disk array device according to the present invention further includes a backboard that is disposed on the front side of the housing and connects the storage devices to the control device, and the backboard is connected to the front side. It can be arranged along the direction toward the back side, and can be arranged on the front surface in the housing and connected to an operation unit for inputting predetermined information to the control device. With this configuration, in addition to the advantages, communication between the operation unit, the storage device, and the control device can be easily performed via a backboard.

  Furthermore, the disk array device according to the present invention further includes a tray on which each of the storage devices is mounted, and the tray is configured so that when the storage device is disposed in the housing, the entire tray is It is also possible to provide a configuration that is housed in a housing. With this configuration, when the storage device is disposed (inserted) in the housing, the tray is completely hidden in the housing. Therefore, since it is not necessary to make the tray itself into a complicated shape including an aesthetic design or the like, the tray can have a simpler structure and can be downsized.

  According to the present invention, it is possible to provide a disk array device that can mount a storage device at a high density and can efficiently cool the storage device and the control device disposed inside the housing.

FIG. 1 is a perspective view of a disk array device according to an embodiment of the present invention. FIG. 2 is a plan view showing the inside of the disk array device shown in FIG. FIG. 3 is a front view of the disk array device shown in FIG. FIG. 4 is a perspective view of the HDD disposed inside the disk array apparatus shown in FIG. FIG. 5 is a perspective view showing a state where the HDD shown in FIG. 4 is mounted on the tray. 6 is a cross-sectional view taken along line VI-VI shown in FIG. 2 when the disk array device shown in FIG. 1 is attached to the rack. 7 is a cross-sectional view taken along line VII-VII shown in FIG. FIG. 8 is a perspective view showing a state in the middle of mounting on the side rail for fixing the disk array device shown in FIG. FIG. 9 is a cross-sectional view according to FIG. 6 of a disk array device according to another embodiment of the present invention. FIG. 10 is a plan view showing the inside of a disk array device according to another embodiment of the present invention. FIG. 11 is a side view of the disk array device shown in FIG. FIG. 12 is a plan view showing the inside of a disk array device according to another embodiment of the present invention. FIG. 13 is a plan view showing the inside of a disk array device according to another embodiment of the present invention.

  Next, a disk array device according to an embodiment of the present invention will be described with reference to the drawings. In addition, embodiment described below is the illustration for demonstrating this invention, and this invention is not limited only to these embodiment. Therefore, the present invention can be implemented in various forms without departing from the gist thereof.

  1 is a perspective view of a disk array device according to an embodiment of the present invention, FIG. 2 is a plan view showing the inside of the disk array device shown in FIG. 1, and FIG. 3 is a front view of the disk array device shown in FIG. 4 is a perspective view of the HDD disposed in the disk array device shown in FIG. 1, FIG. 5 is a perspective view showing a state in which the HDD shown in FIG. 4 is mounted on the tray, and FIG. FIG. 7 is a cross-sectional view taken along line VI-VI shown in FIG. 2 when the disk array apparatus shown in FIG. 2 is attached to the rack, and FIG. 7 is a cross-sectional view taken along line VII-VII shown in FIG. 8 is a perspective view showing a state in the middle of mounting on the side rail for fixing the disk array device shown in FIG.

  In the drawings, for easy understanding, the thickness, size, enlargement / reduction ratio, etc. of each member are not matched with the actual ones. Further, in this embodiment, for the sake of brevity, the direction from the front surface to the back surface and from the back surface to the front surface of the disk array device is defined as “depth direction” (the arrow X direction shown in FIG. 1), and perpendicular to the depth direction. This is described as “width direction” (arrow Y direction shown in FIG. 1).

  As shown in FIGS. 1 to 8, the disk array device 1 according to the present embodiment includes a housing 10, a plurality of storage device modules 30 disposed on the front surface 11 side in the housing 10, and the housing 10. The storage device module 30 is provided with a control device 50 disposed on the back side.

  The housing 10 has a plurality of air inlets 12 formed in the front surface 11, and outside air 101 and 102 are introduced into the housing 10 from these air inlets 12. A control panel 15 for operating the disk array device 1 is disposed on the front surface 11. The inside of the housing 10 is, in order from the front surface 11 side (left side in FIG. 2) to the back side (right side in FIG. 2), a storage device module placement area MA in which the storage device modules 30 are placed. A fan arrangement area FA in which a plurality of fans 13 for introducing (intake) outside air from the intake port 12 is arranged, and a control apparatus arrangement area CA in which the control device 50 is arranged. Further, an exhaust port (not shown) for exhausting the air in the housing 10 is formed on the back surface 14 of the housing 10.

  In the vicinity of the central portion in the width direction of the storage device module arrangement area MA, two side walls 18 and 19 are formed so as to be opposed to each other along the depth direction at a distance from each other. The outside air guiding portion 16 that guides a part of the outside air introduced into the housing 10 from the air inlet 12 toward the back side is formed by the space formed between the two. In the storage device module arrangement area MA, the storage device modules 30 are arranged on both sides in the width direction across the outside air guiding portion 16. In other words, the storage device module 30 is not provided in the outside air guiding unit 16, and the outside air that has passed through the outside air guiding unit 16 maintains the temperature when passing through the intake port 12, and the control device is provided. It is supplied to the area CA. Further, among the side surfaces extending in the depth direction of the housing 10, a plurality of HDDs 31 constituting the storage device module 30, which will be described in detail later, are disposed in the housing 10 on the side surface that becomes the storage device module disposition area MA. An insertion / removal port 17 that can be taken out is formed. Reference numeral 23 denotes a guide member that guides the HDD 31 when the HDD 31 is inserted and removed.

  The fan disposition area FA communicates with the storage device module disposition area MA and the control apparatus disposition area CA, and drives the fan 13 to introduce outside air into the housing 10 from the air inlet 12. A part of the outside air 102 introduced from the intake port 12 is blown to the control device 50 via the outside air guiding unit 16 to cool the control device 50. That is, the outside air 102 that reaches the control device 50 through the outside air guiding unit 16 maintains a low temperature when passing through the intake port 12 without being heat exchanged with the storage device module 30. 50 can be efficiently cooled. On the other hand, the remaining outside air 101 introduced from the air inlet 12 is blown to the storage device module 30, cools the storage device module 30, and is then introduced into the control device arrangement area CA. The outside air after cooling the storage device module 30 and the control device 50 is exhausted to the outside through an exhaust port (not shown) formed on the back surface 14 of the housing 10. In addition, a part of the outside air introduced into the control device disposition area CA is exhausted to the outside of the housing 10 by an exhaust fan (not shown) disposed in the power supply unit 60 described in detail later. As shown in FIG. 7, the fan 13 is connected to a connector 37 of the storage device module 30 and a connector 53 of the mother board 52 described in detail later via a fan control board 54.

  The storage device modules 30 are respectively disposed on both sides in the width direction across the outside air guiding portion 16 in the storage device module disposition area MA of the housing 10. Each storage device module 30 includes six HDDs 31 in total, three in the height direction and two in the depth direction. In the present embodiment, the storage device module 30 has a 2U size. In this manner, since the storage device modules 30 have the HDDs 31 arranged in the depth direction, the HDDs 31 can be arranged in multiple rows in the depth direction as long as the length of the disk array device 1 permits. Therefore, the number of HDDs 31 can be increased, and high-density mounting can be improved.

  Specifically, for example, as shown in FIGS. 10 and 11, if three rows of HDDs 31 are arranged in the depth direction, a total of nine storage units 30 (in this embodiment, even in a 2U size) Since two storage device modules 30 are arranged, a total of 18 HDDs 31 can be mounted. Similarly, the number of HDDs 31 mounted can be increased by arranging the HDDs 31 in four rows and five rows in the depth direction.

  Each HDD 31 is mounted on a tray 35 and disposed at a predetermined position in the housing 10 as shown in FIG. The tray 35 includes a main body 34 and arm portions 36 and 37 extending from both sides of the main body 34, has a substantially U shape in plan view, and the HDD 31 is disposed in the housing 10. In this case, the surface 32 on the front surface 11 side and the surface 33 on the rear surface 14 side of the HDD 31 are supported by arm portions 36 and 37, respectively.

  Furthermore, on the outside air guiding section 16 side of each storage device module 30, a backboard 40 for connecting each HDD 31 and the control device 50 is provided along the side walls 18 and 19 (that is, along the depth direction). Each). These backboards 40 are connected to each other, and as shown in FIG. 2, the end portion on the front surface 11 side of one backboard 40 is connected to the control panel 15 disposed on the front surface 11 of the housing 10. They are connected via connection wiring 41. In this way, by arranging the backboard 40 along the side walls 18 and 19, one end of the backboard 40 can be positioned in the vicinity of the front surface 11 of the housing 10. The control board 15 and the back board 40 can be easily connected. That is, since the control panel 15 can be disposed on the front surface 11 without any problem, the operability of the disk array device 1 can be improved.

  The backboard 40 is connected to the connector 37 of the storage device module 30, the fan control board 54, and the connector 53 of the motherboard 52 as shown in FIG. A signal can be transmitted to the mother board 52.

  The control device 50 is disposed in the control device disposition area CA and includes a mother board 52 on which various elements such as a CPU 51, a connector 53, and various wirings are disposed. A power supply unit 60 that supplies power to the disk array device 1 is disposed in the control device disposition area CA.

  As shown in FIG. 8, the disk array device 1 can be fixed to a rack or the like using a fixing member such as a side rail 150. The side rail 150 is disposed to face the side surface along the depth direction of the housing 10, and has a side surface 151 having an area capable of shielding at least the insertion / removal port 17, and a flange 152 formed at the front side end of the side surface 151. And a support portion 153 that protrudes from the lower end of the flange 152 and supports the bottom surface of the housing 10. The disk array device 1 is supported by the side rails 150 from both sides, so that the disk array device 1 can be fixed to a rack or the like. When the disk array device 1 is mounted on these side rails 150, the disk array device 1 is slid in the direction of arrow Z shown in FIG. . Thus, by shielding (closing) the insertion / removal port 17, it is possible to prevent the storage device from being inadvertently inserted / removed when the disk array device 1 is operated.

  Next, an example of mounting the storage device module 30 on the housing 10 will be described in detail. In the following description, in order to deepen the understanding, specific dimensions are shown and described. However, these dimensions are examples, and the present invention is not limited to these dimensions.

In the present embodiment, a 3.5-inch HDD is used as the HDD 31, and as shown in FIG. 4, for example, the width (W ₁ ) is 102 mm, the depth (D ₁ ) is 147 mm, and the height is high. The height (H ₁ ) is 26 mm. As shown in FIG. 5, each HDD 31 is mounted on a tray 35 and disposed at a predetermined position in the housing 10. The external dimensions of the HDD 31 to which the tray 35 is attached are, for example, 107 mm in width (W ₂ ), 190 mm in depth (D ₂ ), and 26 mm in height (H ₂ ).

As described above, the storage device module 30 including the six HDDs 31 to which the trays 35 are attached is arranged on both sides in the width direction with the outside air guiding portion 16 in the housing 10 sandwiched, as shown in FIG. Established. Here, when the disk array device 1 is mounted on the 19-inch rack 100, the length in the width direction (frame interval) of the 19-inch rack 100 is 483 mm, so the length in the width direction of the housing 10 is from 483 mm. Will be defined with a smaller size. Therefore, in this embodiment, the length in the width direction of the housing 10 is set to 480 mm. When the storage device module 30 is arranged close to the side surfaces on both sides in the width direction of the housing 10 so as not to create a useless space, the storage device module 30 is disposed in the depth of the HDD 31 mounted on the tray 35 ( D ₂ ) Considering the thickness of the backboard 40 and the thicknesses of the side walls 18 and 19, the length in the width direction of the outside air guiding portion 16 can be set to 80 mm.

  Further, since the entire tray 35 is completely stored in the housing 10 when the HDD 31 is disposed in the housing 10, the tray 35 needs to have a complicated shape including an aesthetic design. There is no. For this reason, the tray 35 can have a simpler structure and can be downsized. Specifically, for example, as shown in FIG. 9, the tray 35 can reduce the thickness of the main body 34. For example, by reducing the thickness of the main body 34 by 35 mm, the outside air guiding portion 16 can be reduced. The length in the width direction can be 150 mm. Therefore, since a larger amount of low temperature outside air can be passed through the outside air guiding unit 16, the control device 50 can be cooled more efficiently. If the thickness of the main body 34 can be further reduced, the length in the width direction of the outside air guiding portion 16 can be further increased, and the control device 50 can be cooled more efficiently.

  In the present embodiment, the case where the outside air guiding portion 16 is formed at the central portion in the width direction of the housing has been described. However, the present invention is not limited to this, and the outside air guiding portion 16 is, for example, as shown in FIG. It may be further formed on both sides of the body 10 in the width direction. In this case, side walls 28 and 29 extending along the depth direction are respectively formed between the side wall extending from the front surface 11 side of the housing 10 to the back side and the storage device module 30, and from the front surface 11 side of the housing 10. The outside air guiding portion 16 can be formed by a space formed by both side walls extending to the back side and the side walls 28 and 29. By increasing the number of outside air guiding portions 16 formed in this way, a larger amount of low temperature outside air can be supplied to the control device arrangement area CA, so that the control device 50 can be cooled more efficiently. Can do.

  Further, in the present embodiment, the case where one backboard 40 is provided for one storage device module 30 has been described. However, the present invention is not limited to this. For example, as illustrated in FIG. A configuration may be adopted in which all the HDDs 31 are connected by one backboard 40 by disposing one backboard 40 in the center in the width direction along the depth direction. In this case, the outside air guiding portion 16 may be formed on both sides in the width direction of the housing 10 without being formed in the central portion in the width direction of the housing.

  In addition, the formation position and the number of formation of the outside air guiding section 16 are not particularly limited, and it is possible to supply low temperature outside air to the controller arrangement area CA without heat exchange by the storage device module 30. Then, the formation position and the number of formation of the outside air guiding portion 16 can be arbitrarily determined by the arrangement position of the control device 50 and the power supply unit 60 in the control device arrangement area CA (see FIGS. 12 and 13). it can.

  DESCRIPTION OF SYMBOLS 1 ... Disk array apparatus, 10 ... Housing | casing, 11 ... Front surface, 12 ... Intake port, 13 ... Fan, 15 ... Control panel, 16 ... Outside air guidance part, 17 ... Insertion / extraction port, 30 ... Storage device module, 31 ... HDD, 35 ... Tray, 40 ... Backboard, 50 ... Control device, 100 ... 19 inch rack, 101,102 ... Outside air, 150 ... Side rail

Claims (7)

A housing with an air inlet formed on the front;
A storage device module having a plurality of storage devices arranged on the front side in the housing and arranged from the front side to the back side;
A control device disposed on the back side of the storage device module in the housing and controlling each of the storage devices;
With
From the front surface side to the back side of the storage device module placement region, a side wall that blocks passage of outside air to the storage device module placement region is formed,
Forming an outside air guiding portion that is defined by the side wall and guides a part of the outside air taken in from the intake port to the control device without touching the storage device;
A disk array device in which the control device is provided on a straight line from the intake port through the outside air guiding unit. A plurality of storage device modules;
The plurality of storage device modules are arranged in parallel in a direction perpendicular to the direction from the front side to the back side,
The disk array device according to claim 1, wherein the outside air guiding unit is formed between the storage device module and a storage device module arranged in parallel with the storage device module. The outside air guiding portion is formed at a central portion in the width direction of the housing, and further, another outside air guiding portion is formed between the storage device module and a side wall that defines the outer shape of the housing. The disk array device according to claim 1 or 2.   4. The disk array according to claim 1, wherein an insertion / removal port in which the storage device is disposed in the housing and can be taken out is formed on a side wall that defines an outer shape of the housing. 5. apparatus.   5. The disk array device according to claim 4, wherein the housing can shield the insertion / removal port by the fixing member when the housing is attached to a fixing member for fixing the housing. A backboard disposed on the front side of the housing and connecting the storage device and the control device;
The backboard is disposed along the direction from the front side to the back side, and is disposed on the front surface in the housing and connected to an operation unit that inputs predetermined information to the control device. The disk array device according to any one of claims 1 to 5. A tray on which each storage device is mounted;
The disk array device according to any one of claims 1 to 6, wherein when the storage device is disposed in the housing, the tray is entirely accommodated in the housing.

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