KR100974916B1 - Virtual disk drive file transfer system and the method thereof - Google Patents

Abstract

The present invention relates to a virtual disk drive file transfer system and a method thereof, and more particularly, to prevent transmission delay by directly connecting a user terminal and a server or a client, and to easily move a section through a user interface using a virtual disk drive. To provide a virtual disk drive file transfer system and a method thereof.

In the virtual disk drive file transfer system comprising a server and a user terminal of the virtual disk drive file transfer apparatus according to the present invention, the user terminal comprises a user interface including a virtual disk drive that is virtually formed and set in a user terminal; A database for storing file information, size information, node information, and block information, which are header information, an SMB manager for controlling the user interface by the SMB protocol, and a header of the database according to a file requested by the user through the user interface. The SMB gateway may be configured of a file manager that receives the request file directly from the server using information and transmits the request file to the user interface.

Virtual disk drive, server, client, header

Description

VIRTUAL DISK DRIVE FILE TRANSFER SYSTEM AND THE METHOD THEREOF

The present invention relates to a virtual disk drive file transfer system and a method thereof, and more particularly, to prevent transmission delay by directly connecting a user terminal and a server or a client, and to easily move a section through a user interface using a virtual disk drive. The present invention relates to a virtual disk drive file transfer system and a method thereof.

The physical storage capacity of individual user computers is growing at an extremely high rate. At the same time, however, the amount of data stored in the storage device is also increasing rapidly. Users (or users) want more high-definition and high-quality multimedia information, and accordingly the size of multimedia data is growing. In addition, users' desire to access their data anytime and anywhere has increased. However, only the physical storage device or the portable storage device (USB external storage device, etc.) of the personal user computer did not solve the user's desire. The reason for this is the physical limitations of storage space and the limitation of accessibility wherever and whenever it is not accessible.

Among the various efforts to overcome this problem are network storage services (www.totodisk.co.kr, www.webhard.co.kr). It is also commonly referred to as a 'web hard' or 'web storage' service.

Early web storage services provided users with a large amount of storage and wide bandwidth, enabling them to access their computers and networks anytime, anywhere, even if they weren't their own personal computers. However, users wanted faster network speeds and more storage, which in turn increased their investment in physical storage and network bandwidth.

As a result, many efforts have been made to overcome the problem of rapid cost increase while providing users with a faster speed and more storage space.

The effort came in two major forms: one effectively using storage and the other reducing network bandwidth usage. Representative examples of the efforts are 'a method and apparatus for storing and downloading a duplicate file using the information of the file (Korean Patent Publication No. 2006-0073724, published date: June 29, 2006,' Invention and a method and method for searching for an optimal node for peer-to-peer data communication (Korean Patent Laid-Open Publication No. 2005-0002356, published on January 7, 2005) The invention relates to 'cited invention 2'.

In order to efficiently use the storage space, Cited Invention 1 suggests a method of processing the index data and the counter without storing the same data among user's storage request data separately. Looking at the shortcomings of the general file system in contrast to the Invention 1, existing operating systems were not efficient because they are treated as different files even if the file size is slightly different or even if the byte configuration of the entire file is different. However, Cited Invention1 separates each file into small block units (for example, 64 Kbytes) and checks the sameness for each block unit to solve this problem. Only stored separately, increased storage for duplicate files. In addition, by configuring an index for a block and uploading it to the web storage server, the index is uploaded first before the block itself is uploaded to check for equality, thereby reducing network bandwidth usage that may be caused by uploading the same file. The invention is effectively lowered. In other words, the configuration of Citation Invention 1 achieves the effect of saving storage and reducing network bandwidth usage.

Cited Invention 2 overcomes the limitations that server-side networks can overcrowd in a typical client-server architecture, with peer-to-peer (or simply P2P) communication utilizing client nodes. The present invention relates to a method for searching for a node having an optimal efficiency among the methods.

The structure and effects of the Cited Invention 1 or Cited Invention 2 have been modified or applied in various forms and applied to a web storage service.

As described above, web hard or web storage service through the web interface or the user interface of the application program has been universalized by utilizing the client-server structure, duplicate file processing, and P2P technology.

However, the existing inventions, despite being a service for providing a storage medium, did not provide a convenient interface as when users use their local storage. For example, it did not use a user interface that accesses the operating system's filesystem like Windows Explorer. As a way of overcoming this problem, services are being provided that allow virtual network storage to be accessed in the same or similar way as accessing local storage in a manner similar to WebDav. However, in this case, there was only a slight improvement of the user interface, and there was a problem in that it did not provide the responsiveness and accessibility provided by the actual local storage.

In particular, as shown in Figure 1, due to the improvement of the compression method in the case of the current large-capacity multimedia file, even if the user selects the part he wants to watch or listen with little delay time, even if the existing server ( 20) The virtual storage and web storage services using the method can be viewed or listened to after downloading the entire file, or only the downloaded part can be watched or listened to, even though only a part can be downloaded and viewed or listened to from the server 20, The user has a problem that it is impossible to scroll and view the multimedia data portion that has not been downloaded yet by using the user terminal 10.

In addition, while maintaining the responsiveness to large data such as multimedia data in real time, there was a problem that can not reduce the network and storage.

In order to solve the above problems, an object of the present invention is to directly connect the user terminal and the server or client to prevent transmission delay.

In order to solve the above problems, an object of the present invention is to facilitate section movement through a user interface using a virtual disk drive.

In order to solve the above problems, an object of the present invention is to provide a virtual disk-type network storage to the user while enabling real-time viewing and listening to multimedia data.

In order to solve the above problems, an object of the present invention is to reduce the storage space and network usage while ensuring a quick response and free accessibility of multimedia data.

In the virtual disk drive file transfer system comprising a server and a user terminal of the virtual disk drive file transfer apparatus according to the present invention, the user terminal comprises a user interface including a virtual disk drive that is virtually formed and set in a user terminal; A database for storing file information, size information, node information, and block information, which are header information, an SMB manager for controlling the user interface by the SMB protocol, and a header of the database according to a file requested by the user through the user interface. It is preferable that the SMB gateway comprises a file manager that receives the request file directly from the server using information and transmits the request file to the user interface.

The file manager of the virtual disk drive file transfer apparatus according to the present invention further includes a block buffer which temporarily stores each segment constituting a file requested by the user interface and sequentially transmits the segments to the user terminal. It is preferable to be configured.

The user interface of the present invention preferably comprises a local disk drive representing a file corresponding to the user terminal and a virtual disk drive displayed using header information of a file included in the server.

When the section movement command of the file is transmitted through the user interface of the virtual disk drive file transfer apparatus according to the present invention, the file manager searches for the server through the block information corresponding to the section movement and the corresponding file information is displayed. It is preferable to determine whether the file exists and to directly connect to the server including the file information to receive the file.

The file manager of the virtual disk drive file transfer apparatus according to the present invention is preferably interconnected only when the server capable of transmitting the file and the user terminal transmit the file in order to prevent traffic increase.

The node information of the virtual disk drive file transfer apparatus according to the present invention is preferably IP address information allocated to the server.

The block information of the apparatus for transmitting a virtual disk drive file according to the present invention is information including the size and type information of the segment, and the file manager checks the block information and checks whether each segment corresponds to the same. Do.

In a virtual disk drive file transfer system comprising a server, a client, and a user terminal of a virtual disk drive file transfer apparatus according to the present invention, the user terminal includes a virtual disk drive that is virtually formed and set in a user terminal. An interface, a database for storing file information, size information, node information, and block information, which are header information, an SMB manager for controlling the user interface by the SMB protocol, and the file according to a file requested by the user through the user interface. It is preferable that the SMB gateway is composed of a file manager that receives the request file directly from the server or client using the header information of the database and transmits the request file to the user interface.

The file manager of the virtual disk drive file transfer apparatus according to the present invention receives each segment constituting a file requested by the user interface from the server or client, temporarily stores the segments, and transmits the segments sequentially to the user terminal. It is preferable to further comprise a block buffer to enable.

The user interface of the virtual disk drive file transfer apparatus according to the present invention comprises a local disk drive representing a file corresponding to the user terminal and a virtual disk drive displayed using header information of a file included in the server or client. It is desirable to be.

When the section movement command of the file is transmitted through the user interface of the virtual disk drive file transfer apparatus according to the present invention, the file manager searches for the server or the client to determine whether the corresponding file information exists, and the file It is preferable to connect directly to the server or client including the information to receive the file.

In the file manager of the virtual disk drive file transfer apparatus according to the present invention, when the server or client capable of transmitting the file is a transmission delay, the file manager determines a device having a small transmission delay time among the server or client to determine the user. It is preferable to transmit a file of the device having a low transmission delay time to a terminal of the terminal.

The file manager of the virtual disk drive file transfer apparatus according to the present invention is preferably interconnected only when the server or client capable of transmitting the file and the user terminal transmit the file in order to prevent traffic increase.

The node information of the virtual disk drive file transfer apparatus according to the present invention is preferably IP address information allocated to the server or client.

The block information of the virtual disk drive file transfer apparatus according to the present invention includes the size and type information of the segment of the server or the client, and the file manager checks the block information and checks whether or not each segment is the same. It is preferably information.

In the virtual disk drive file transfer method according to the present invention, File management step of transmitting the header information for the file to the user interface to the server or the client through the user interface of the user terminal, and through the user interface When opening a file, the file manager managing the file searches the server or client to determine whether the corresponding file information exists, and the file manager directly connects to each corresponding client to transmit the file data to receive the file. It is preferably configured to include the step.

In the file data transfer step of the virtual disk drive file transfer method according to the present invention, the file manager receives each segment constituting the file requested by the user interface from the server or client and temporarily stores the segment. It is preferably configured to further include the step of sequentially transmitting to the user terminal.

After the file data transfer step of the virtual disk drive file transfer method according to the present invention, if the section movement command of the file is transmitted through the user interface, the file manager through the server through the block information corresponding to the section movement; Alternatively, the method may further include a segment data transmission step of searching for a client to determine whether the corresponding file information exists, and directly connecting the file manager to the corresponding client to receive the file.

In the file data transfer step of the virtual disk drive file transfer method according to the present invention, if the server or client that can transfer the file is a transmission delay, the file manager determines a device having a low transmission delay time among the server or the client. It is preferable to transmit a file of a device having a low transmission delay time to the user's terminal.

In the file data transfer step of the virtual disk drive file transfer method according to the present invention, the file manager is interconnected only when the server or client capable of transmitting the file and the user terminal transfer the file to prevent traffic increase. It is preferable that this be done.

The present invention is effective in preventing transmission delay by directly connecting a user terminal and a server or a client.

The present invention is effective in facilitating section movement through a user interface using a virtual disk drive.

The present invention is effective in enabling real-time viewing and listening to multimedia data while providing a virtual disk-type network storage to a user.

The present invention is effective in reducing storage space and network usage while ensuring fast response and free accessibility of multimedia data.

 The present invention implements a DRD (Dynamic Relay Distribution) file system, which can easily download large files.

The present invention implements a file storage system using a network, creating a virtual drive in my computer, using a conventional Internet browser or an independent application to download or upload a file, and a user-friendly file search environment. (For example, the file explorer on Microsoft's Windows operating system) has the effect of downloading or uploading files.

Hereinafter, with reference to the drawings will be described in detail for the practice of the present invention.

2 is a block diagram showing the overall configuration according to an embodiment of the present invention.

As shown in FIG. 2, the virtual disk drive file transfer system according to the present invention includes a server 200 and a user terminal 100.

The server 200 is a device that manages (or controls) matters corresponding to file input and output of a virtual disk drive that can be used virtually by a user.

The user terminal 100 may receive file information from the server 200 through the user interface 110.

The user interface 110 includes a virtual disk drive that is virtually formed and set in the user terminal 100.

The virtual disk drive, unlike a drive installed in a hard drive of a conventional terminal, refers to a virtual drive connected to the Internet.

In addition, the user interface 110, like other general drives of the user terminal 100, a virtual drive is displayed to the user. Therefore, the user can access and use the file through the corresponding virtual drive as the general drive.

3 is a block diagram showing the overall configuration according to an embodiment of the present invention.

4 is a diagram illustrating a relationship between a user terminal, a server, and clients of an overall configuration according to the present invention.

5 is a diagram showing a correspondence relationship between header information and each segment of a file according to the present invention.

FIG. 6 is a diagram for using information of a stored segment and an unsaved segment according to an embodiment of the present invention.

As shown in FIG. 3, it can be seen that different clients 300 and 400 are included.

As shown in Figure 4, the client (300, 400) is connected to the server 200 and the Internet, and delivers the header information, etc. of the file stored in the server 200, the control of the server Will receive.

In addition, the clients 300 and 400 may be individual terminals of respective homes or other external terminals. In addition, the client 300 or 400 may theoretically add infinite terminals.

As shown in FIG. 4, the user terminal 100 includes an SMB gateway 120 as well as a user interface 110.

The user interface 110 preferably includes a local disk drive and a virtual disk drive.

The local disk drive represents a file stored in the hard disk of the user terminal 100.

The virtual disk drive is displayed using the header information 130 of a file included in the server 200 or the clients 300 and 400.

The SMB gateway 120 includes a database 250, an SMB manager 122, and a file manager 124.

However, this is only a classification on a logical information flow, and the managers may be integrated and included in the SMB gateway 120.

The database 250 stores file information, size information, node information, and block information, which are header information 130.

The file information may include general document information, video information, certificate information, and the like.

The node information is IP address information allocated to the server 200 or the clients 300 and 400.

The block information 140 includes size and type information of segments of the server 200 or the clients 300 and 400, and the file manager 124 checks the block information and corresponds to each segment 150. Information that checks the equality of).

Specifically, the block information 140 may be check file information that may check the same information according to a cyclic redundancy checking (CRC) method or include a file size, a file name, a file type, and the like.

The SMB manager 122 controls the user interface 110 by the SMB protocol.

The file manager 124 transmits the request file to the server 200 or the client 300 using the header information 130 of the database 150 according to the file requested by the user through the user interface 110. Directly received from 400 and transmitted to the user interface 110.

In addition, the SMB gateway 120 notifies the logical file system of the virtual disk drive, and maintains logical information such as virtual drive file information, size information, node information, block information, and the like according to a user's request. 122, 124).

In addition, as shown in the drawing, the file manager 124 temporarily receives each segment 150 constituting the file requested by the user interface 110 from the server 200 or the clients 300 and 400. It may be configured to further include a block buffer (124-1) to be stored to be transmitted to the user interface 110 of the user terminal 100 in order to store the segment 150.

As shown in FIG. 5, the header information 130 includes block information 140, and each block information 140 corresponds to each segment 150 of an arbitrary file or video.

Therefore, the file manager 124 can receive all the blocks corresponding to the entire file as soon as possible to easily check the identity of the arbitrary file with other files.

On the other hand, according to an embodiment of the present invention, when the section movement command of the file is transmitted through the user interface 110, the file manager 124 to the server 200 or the client (300, 400) The searcher determines whether the corresponding file information exists, and directly connects to the server 200 or the client 300 or 400 including the file information to receive the file.

Specifically, the section movement command refers to a command to play by watching a certain section by using a predetermined command or a mouse operation when it is necessary to move the section while watching a video.

Therefore, the file manager 124 receives all the blocks corresponding to the entire file as soon as possible and easily checks the sameness with other files for any file, and then, when the section movement command is transmitted, The section can be directly received from the server 200 or the client 300 or 400 having the corresponding file with reference to the block.

In addition, although not shown in the drawings, the section movement command during the video viewing may be applied to a large document file in one embodiment of the present invention.

A certain page of the large document file (for example, thousands of document files) may be directly moved to edit the section and then stored.

In addition, according to an embodiment of the present invention, the file manager 124 is the server 200 or the client 300, 400 that can transmit the file is delayed transmission, the file manager 124 is the server ( 200 or the client 300 or 400 determines a device having a low transmission delay time and transmits a file of the device having a low transmission delay time to the user terminal 100.

Specifically, as shown in FIG. 6, the file manager 124 determines a device having a low transmission delay time among the server 200 or the clients 300 and 400 in the first storage segment 151 and the second storage segment. The server or client including the server 153 may be searched for by referring to the node information, and the file may be quickly received from the server 200 or the client 300 or 400 corresponding thereto.

7 is a flowchart illustrating information transfer between components according to an embodiment of the present invention.

8 is a view showing what is displayed on the user interface of the user terminal according to the present invention.

9 is a flowchart illustrating a procedure of processing a case where a section load is applied according to an embodiment of the present invention.

10 is a flowchart illustrating a procedure of processing a case of a transmission delay according to an embodiment of the present invention.

11 is a flowchart illustrating a processing procedure when a user makes a section movement command according to an embodiment of the present invention.

FIG. 12 is a diagram illustrating details of executing the section movement command of FIG. 11.

Hereinafter, a method of receiving a file from a server or a client by logging in to a virtual disk drive file transfer system through a user terminal will be described with reference to the drawings.

As shown in Fig. 7, the virtual disk drive file transfer method is largely divided into a login step, a file management step, and a file data transfer step.

First, the user logs in to the server through the user terminal (S100; login step).

Then, the header information for the file is requested to the server or the client through the user interface of the user terminal and transmitted to the user interface (S110; file management step).

When opening the file through the user interface, the file manager managing the file searches the server or the client to determine whether the corresponding file information exists, and the file manager directly connects to the corresponding client to connect the file. Received (S120; file data transmission step).

As shown in Fig. 8, the user terminal receives the header information (file information, size information, node information and block information) from the server, lists the file information to the user, and updates and maintains detailed information on each file.

Specifically, when the user clicks on the video 1 of the user interface (S500), the file information corresponding to the video 1 is searched for and simultaneously transmitted in parallel from nodes having the blocks of the file.

Here, the node is stored in a server or the like without directly appearing in the user interface.

That is, as shown in Table 1 below, the file name, size, and date of modification may appear in the user interface, but it is preferable that the node information and the total number of blocks retained do not appear.

Thus, the user can download a file in an environment such as accessing a file inside his computer regardless of whether it is transmitted from any client or server.

As shown in FIG. 9, the user terminal receives and stores header information (file information, size information, node information and block information) from a server or a client (S200).

Then, the file is opened through the user interface of the user terminal (S210).

Subsequently, the user terminal receives the file from the server or the client and plays the file (S220).

In operation S230, the file manager searches whether there is a section load among the file sections.

Subsequently, the file manager searches for a client or a server in which the same file is stored (S250).

In addition to the above-described steps, the file manager receives each segment constituting the file requested by the user interface from the server or the client and temporarily stores the segments so as to sequentially transmit the segments to the user terminal (S260). It is configured to further include.

As shown in FIG. 10, a method of determining a device having a low transmission delay time among servers or clients is the same as that of steps S200 to S220.

When the server or the client capable of transmitting the file is in addition to the above-described steps, the file manager determines that the device having the shortest transmission delay time is either the server or the client, and the device having the small transmission delay time to the terminal of the user. The file is transmitted (S350, S360).

As shown in FIG. 11, after the above-described steps, when the section movement command of the file is transmitted through the user interface, the file manager searches for the server or the client through block information corresponding to the section movement. Determining whether the corresponding file information is present, the file manager is connected to each of the corresponding client directly, and further comprising the step of transmitting the segment data of the file to receive the file (S450, S460).

Specifically, as shown in FIG. 12, when the section movement command of the file, which moves from the portion A to the portion B, is transmitted through the user interface, the file manager may block information corresponding to the section movement (block 4 in the figure). The server or client is searched to determine whether the corresponding file information exists, and the file manager is directly connected to each corresponding client to receive the file.

In the above-described embodiments of the present invention, in the file data transmission step, the file manager is interconnected only when the server or client capable of transmitting the file and the user terminal transmit the file to prevent traffic increase. Is done. In other words, the present invention implements a DRD (Dynamic Relay Distribution) file system, which can easily download a large file.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, changes, and modifications are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a flow chart of each configuration according to the background art.

Figure 2 is a block diagram showing the overall configuration according to an embodiment of the present invention.

Figure 3 is a block diagram showing the overall configuration according to an embodiment of the present invention.

4 is a diagram illustrating a relationship between a user terminal, a server, and clients in the overall configuration according to the present invention.

5 is a diagram showing a correspondence relationship between header information and each segment of a file according to the present invention;

FIG. 6 is a diagram for using information of a stored segment and an unstored segment according to an embodiment of the present invention. FIG.

7 is a flow chart of information transfer between components according to an embodiment of the present invention.

8 is a view showing what is displayed on the user interface of the user terminal according to the present invention.

9 is a flowchart illustrating a procedure of processing a case where a section load is applied according to an embodiment of the present invention.

10 is a flowchart showing a procedure of processing a case of a transmission delay according to an embodiment of the present invention.

11 is a flowchart illustrating a processing procedure when a user makes a section movement command according to an embodiment of the present invention.

12 is a view showing details of the execution of the section movement command of FIG.

<Description of Signs of Major Parts of Drawings>

100: user terminal 110: user interface 120: SMB gateway 124: file manager 200: server 250: database

300: Client 1 400: Client 2

Claims (20)

A user interface including a server and a user terminal, the user terminal including a virtual disk drive that is virtually formed and set in a user terminal; SMB gateway is included, The SMB gateway includes: a database for storing file information, size information, node information, and block information, which are header information; An SMB manager for controlling the user interface by an SMB protocol; In the virtual disk drive file transfer system including a file manager for receiving the request file directly from the server using the header information of the database according to the file requested by the user interface to the user interface to the user interface In When the section movement command of the file is transmitted through the user interface, the file manager searches for the server through the block information corresponding to the section movement, and determines whether the corresponding file information exists and determines the file information. Virtual disk drive file transfer system characterized in that the direct connection to the containing server receives the file. The method of claim 1, The file manager, A block buffer is provided to temporarily store each segment constituting a file requested by the user interface so that the segments can be sequentially transmitted to the user interface. The file manager is a virtual disk drive file transfer system, characterized in that the interconnection is made when the server and the user terminal to transmit the file to prevent the traffic increase. The method of claim 1, The user interface, A local disk drive representing a file corresponding to the user terminal; Includes a virtual disk drive to display using the header information of the file included in the server, The node information includes the IP address information assigned to the server, The block information includes size and type information of a segment, and the file manager includes information for checking whether the block information is equal to each other by checking the block information. File transfer system. delete delete delete delete The method according to any one of claims 1 to 3, In addition to the server and the user terminal, the client further includes, The file manager is provided to directly receive the request file from the server or client using the header information of the database according to the file requested by the user through the user interface, and deliver the request file to the user interface. When the section movement command of the file is transmitted through the user interface, the file manager searches for the server or client to determine whether the corresponding file information exists, and directly to the server or client including the file information. Virtual disk drive file transfer system characterized in that the connection is received by the file. The method of claim 8, The block manager of the file manager is provided to temporarily store each segment constituting the file requested by the user interface from the server or the client and to temporarily store the segments to the user interface. The virtual disk drive of the user interface is provided to display using the header information of the file included in the server or client, The file manager is provided such that the server or client capable of transmitting the file and the user terminal are interconnected only when the user terminal transmits the file in order to prevent traffic increase. The node information includes the IP address information assigned to the server or client, The block information includes size and type information of segments of the server or client, and the file manager includes information for checking whether the block information is equal to each other by checking the block information. Virtual disk drive file transfer system. delete delete The method of claim 8, The file manager, If the server or client capable of transmitting the file is a transmission delay, the file manager determines a device having the least transmission delay time among the server or the client and transmits the file of the device having the small transmission delay time to the terminal of the user. Virtual disk drive file transfer system, characterized in that. delete delete delete The user is provided to log in to the virtual disk drive file transfer system through the user terminal to receive files from the server or client, A file management step of requesting a server or a client for header information about the file through a user interface of a user terminal and transmitting the same to the user interface; When opening the file through the user interface, the file manager managing the file searches for the server or client to determine whether the corresponding file information exists, and the file manager directly connects to the corresponding server or client. A file data transmission step of receiving the file; In the virtual disk drive file transfer method is provided that includes, After the file data transfer step, When the section movement command of the file is transmitted through the user interface, the file manager searches for the server or the client through block information corresponding to the section movement, and determines whether the corresponding file information exists, and the file A segment data transmission step of a file that the manager directly connects to the corresponding server or client and receives the file; Virtual disk drive file transfer method characterized in that it is further included. The method of claim 16, In the file data transmission step, the file manager, And virtually storing each segment constituting the file requested by the user interface from the server or the client and temporarily storing the segment so as to sequentially transmit the segment to the user terminal. How to transfer disk drive files. delete The method of claim 16, In the file data transmission step, If the server or client capable of transmitting the file is a transmission delay, the file manager determines a device having the least transmission delay time among the server or the client and transmits the file of the device having the small transmission delay time to the terminal of the user. Virtual disk drive file transfer method. The method of claim 16, In the file data transmission step, And the file manager is interconnected only when the server or client capable of transmitting the file and the user terminal transmit the file in order to prevent an increase in traffic.

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