KR20070121264A - Burglar protecting system for usb memory and method thereof - Google Patents

Abstract

A system and a method for preventing theft of a USB memory are provided to issue an alarm when the USB memory is separated from the connected main computer without any proper procedure, and enable the user to recover the USB memory by recording a name, a phone number, and an address of a user to a memory area of the USB memory, and displaying recorded data to a separate window when the USB memory is connected to the main computer. A USB connector(12) is connected to a USB port of the main computer(1). The memory area(100) performs a data reading and writing operation. A USB controller(14) controls access to the memory area from the main computer. The memory area is enabled by registration to the main computer and includes an alarm application issuing the alarm when the USB connector is separated from the USB port without performing a USB device removing process. The alarm application includes an authenticator performing an ID/password authentication process for accessing the memory area and selectively performing the authentication process if the USB connector is separated from the main computer. An information display part displays owner information of the USB memory while the USB connector is connected to the main computer.

Description

USBI memory theft prevention system and method {BURGLAR PROTECTING SYSTEM FOR USB MEMORY AND METHOD THEREOF}

1 illustrates a USB memory and a main computer including an anti-theft system according to an embodiment of the present invention.

FIG. 2 is a detailed view of each memory area of the USB memory of FIG. 1; FIG.

3 is a block diagram showing a detailed configuration of the reminder application of FIG.

4 is a flowchart illustrating a method for preventing theft of a USB memory according to an embodiment of the present invention.

5 is a flow chart showing in detail the initialization process of FIG.

      <Description of Symbols for Main Parts of Drawings>

1: main computer 10: USB memory

12: USB connector 14: USB controller

100: memory area 110: system area

120: CD-ROM area 130: general data area

140: secure data area 201: authentication unit

203: alarm unit 205: information posting unit

207: Log information storage unit 209: Memory lock unit

The present invention relates to a USB (Universal Serial Bus) memory, and more particularly to a USB memory anti-theft system and method having an alarm function that can alarm when the USB memory connected to the main computer is removed from the computer without proper procedures will be.

Today's society is rapidly progressing in advanced civilization. In particular, it is no exaggeration to say that the amount of data (including multimedia) encountered by the development of the Internet is increasing exponentially. USB Flash Memory, a kind of storage device that appeared to store such data, solved the problem of high price and capacity in the early days and is easy to use by anyone. Currently available USB memory has a capacity of up to 8GB, and 1GB of USB memory is popularly used. The capacity of such USB memory is continuously developed and developed, and 32GB of USB memory will be introduced this year. USB memory is inexpensive compared to other hardware devices in terms of price, and the need for the memory is explosively increasing because there is a function to protect personal data by adding a password function in memory use. The storage of personal data that can be protected on USB memory is very common and shows high utilization in internet financial transactions which are part of life. In other words, USB memory is the strength of storage and storage of "certificate certificate", which is essential for internet financial transactions, and the ease of movement. It can also be useful for storage of. The advantage of the USB memory is more prominent compared to the size of the disk, which is inconvenient to carry when storing data using a CD, and the demand of a separate writer device and a separate program when recording.

On the other hand, as described above, the USB flash memory with an increased number of users increases the risk of theft of a product by providing an ease of theft rather than a small and simple size. In other words, the USB memory can be easily used by inserting and detaching the USB connector of the main computer. However, the USB memory provides the same convenience to others when the USB memory is not intended to be used by the owner of the USB memory. . Theft of such a USB memory is very small compared to the size of the main computer, so it is difficult to quickly recognize it when lost or stolen. In addition, the existing USB memory is not separated from the main computer without a proper process, there is no separate alarm function, USB memory owner has a problem that can not immediately know the USB memory theft and loss. That is, at present, it is almost impossible to prevent theft of the USB memory. In addition, the existing USB memory is small in appearance, it is difficult to display the contact for recovery when lost. The theft and inability to recover the USB memory is an additional problem when the USB Flash Memory is used as a security or authentication function in public offices and financial institutions.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and to provide a system and method for preventing theft of a USB memory which can alarm when the USB memory connected to the main computer is detached without a proper process.

Another object of the present invention is to recover the USB memory by writing the owner's name, phone number, address, etc. in the memory area of the USB memory when the USB memory is lost, and displaying it in a separate window when the USB memory is connected to the main computer. It is to provide an anti-theft system and method of the USB memory.

In addition, another object of the present invention is to provide an anti-theft system and method of a USB memory, which allows the user to know the usage history of the stolen USB memory by allocating a memory area for recording and storing a log file which is the usage history of the USB memory. To provide.

Another object of the present invention is to provide a system and method for preventing theft of a USB memory which provides a lock function for requesting ID and password input when using the stolen USB memory and restricting the use of other memory in case of unauthorized use. .

Finally, another object of the present invention is to provide a system and method for preventing theft of a USB memory to prevent the format of the memory when the correct ID and password are not entered in order to prevent the initialization of the stolen USB memory.

In order to achieve the above object, the USB memory anti-theft system according to an embodiment of the present invention is a USB connector connected to the USB port of the main computer; A memory area for reading and writing data; And a USB controller for controlling access of the memory area from the main computer, wherein the memory area is registered and activated on the main computer, and the USB connector is disconnected from the USB port without performing a USB device removal process. In case the alarm to the main computer characterized in that it comprises a notification application.

The reminder application may perform an ID and password authentication process for accessing the memory area, and optionally include an authentication unit for performing an authentication process when the USB connector is separated from the main computer.

The reminder application may include an alarm unit configured to perform at least one of an alarm using a sound and an image change in the main computer when the USB device is not removed.

Alarm using the sound is characterized in that one of the buzzer, siren, melody and voice guidance.

The USB memory anti-theft system further includes an information posting unit for controlling to display the personal information of the owner of the USB memory on the display unit of the main computer while the USB connector is connected to the main computer.

In particular, the personal information is characterized in that at least one of the owner's name, phone number, address, email.

The USB memory anti-theft system may further include a log information storage unit configured to store log information related to reading and writing of the memory area by the main computer.

The memory device may further include a memory lock to restrict access of the memory area when the USB device is detached from the main computer without performing the USB device removal process.

The memory area may include a system area in which system information is stored; CD-ROM area where autoboot feature is stored; A general data area in which text, audio and video files are stored; And a secure data area in which secure data requiring security is stored, wherein the reminder application is located in the CD-ROM area.

USB memory theft prevention method according to an embodiment of the present invention to achieve the above object comprises the steps of connecting a USB connector to the main computer; Activating a reminder program by registering a reminder application stored in a USB memory area on the main computer; And alarming the main computer when the USB connector is disconnected from the main computer without performing a USB device removal process.

The method may further include authenticating an ID and a password for accessing the USB memory by the reminder program.

The USB memory may be formatted according to a result of the authentication step.

On the other hand, the USB device removal process is characterized in that any one of the process of removing the USB memory after the termination of the reminder program and the USB memory removal process according to the USB device removal request of the main computer.

The alarming may include: alarming a buzzer, a siren, a melody, and a sound including voice guidance; And alarming an image including a display of the main computer, inverting, blinking, and generating a sub-window including a pre-stored message.

The method may further include storing log information related to data read and write operations for the USB memory area.

The method may further include displaying personal information of the owner of the USB memory on the display of the main computer.

The personal information is characterized in that at least one of the owner's name, phone number, address and email.

Finally, the method may further include a memory locking step of preventing the USB memory from being accessed by accessing another main computer when the USB memory is detached from the main computer without removing the USB device. do.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the description, the main computer described in the present invention includes a personal computer, an office computer, a notebook computer, a mobile terminal such as a mobile phone or a PMP, and the like. In addition, in the USB memory according to the embodiment of the present invention, the memory area may be formed as a flash memory.

1 is a diagram illustrating a main memory to which a USB memory and a USB memory 10 having an anti-theft system according to an exemplary embodiment of the present invention are connected.

Referring to FIG. 1, a USB memory 10 according to an exemplary embodiment of the present invention may include a USB connector 12 for connecting to a main computer 1, a memory area 100 in which an anti-theft system is stored, and a USB connector 12. And a USB controller 14 for controlling memory accesses transferred from.

The USB connector 12 connects the USB port formed in the main computer 1 with the main body of the USB memory 10 to serve as a passage for reading and writing control signals and data from the main computer 1. To perform.

The USB controller 14 controls to perform a control signal of the main computer 1 transmitted through the USB connector 12, a data read operation of the memory area 100, and a data write operation of the memory area 100.

2 is a view showing a memory area of a USB memory having an anti-theft system according to an embodiment of the present invention.

Referring to FIG. 2, the USB memory 10 includes a system area 110, a CD-ROM area 120, a general data area 130, and a secure data area 140. ROM area 120 includes a reminder application 124 to prevent theft.

The system area 110 stores a format type, a sector information, a serial number, a flash memory configuration information, and the like of the USB memory 10. That is, the system area 110 is an area for storing unique information of the USB memory 10 and is an area where general users cannot access or modify it.

When the CD-ROM area 120 is connected to the main computer 1, the CD-ROM area 120 automatically boots the USB memory 10. The CD-ROM area 120 communicates with the operating system of the main computer 1 to drive a predetermined area on the RAM. Is assigned, and activates the reminder application 124 described below by using the assigned drive. To this end, in the CD-ROM area 120, a boot area 122 which automatically performs booting when the USB memory 10 is connected and allocates a drive, and after the main computer 1 recognizes the USB memory 10, And a personal information storage area 126 that is displayed on the display unit of the main computer 1 for a predetermined time period, and a reminder application 124 registered on the assigned drive to prevent theft of the USB memory 10. .

The personal information storage area 126 stores personal information including a name, a phone number, an owner's address, and the like of the owner of the USB memory 10, and may input letters designated by the owner. When the USB memory 10 is connected to the main computer 1, the personal information stored in the personal information storage area 126 is used for the system information stored on the system area 110 by the CD-ROM's automatic booting function. It can be displayed in addition to the window window to be published, or a separate window window can be created and displayed in the created new window window. In addition, the personal information stored in the personal information storage area 126 of the present invention can be modified and deleted through a separate ID / password authentication process.

3 is a block diagram illustrating a detailed configuration of a reminder application according to an embodiment of the present invention.

3, after the notification application 124 of the present invention publishes the system information of the system area 110 and the personal information of the personal information storage area 126 after the connection of the USB memory 10 is made, It is registered in the drive assigned by the main computer 1 to activate the reminder program. Theft described below is a case where the USB memory 10 is separated from the main computer 1 without removing the USB memory 10 from the main computer 1. The removal process is a process of using the "remove the USB memory 10 from the main computer 1" icon activated on one side of the main computer, and then going through an authentication function that asks the reminder application 124. In fact, if you choose to exit the Notifier program, you will be able to proceed with the authentication process, release each drive to the standard of the operating system, check the window that says "Safely Removeable", and then remove the USB device. have. In addition, when the user uses the USB device removal icon at the bottom of the main computer 1 tray, the user must also remove the USB device from the main computer 1 after the authentication process presented by the reminder program.

The reminder program activated by the reminder application 124, when the USB memory 10 is to be detached from the main computer 1, the authentication unit 201 asking for an ID / password, the main computer 1 without a procedure of the authentication function. The alarm unit 203 that alarms when the USB memory 10 is detached from the personal computer, and the personal information stored in the personal information storage area 126 when the stolen or lost USB memory 10 is connected to and used by another main computer. If the information posting unit 205 for generating a window to activate the information on the display unit of the main computer and the stolen or lost USB memory 10 are used without the authentication process of the authentication unit 201, log information on the usage history is displayed. The log information storage unit 207 to store, the number of attempts to access the stolen or lost USB memory 10, for example, 10 times or more, if a number of times, the memory to prevent the memory access of the USB memory 10 It is configured to include the Mori lock 209.

If the authentication unit 201 wants to use the USB memory 10, the user's ID / password is queried to allow the memory access after the correct ID / password input is made. In addition, the authentication unit 201 may proceed with the removal process by asking the ID / password when activating the removal icon of the main computer 1 when the USB memory 10 is to be detached from the main computer 1. The authentication unit 201 transmits the ID / password to the information posting unit 205 and the memory lock unit 209 when the input of the ID / password is wrong more than a specified number of times. On the other hand, the authentication unit 201 prevents the format of the USB memory 10 without the authentication process of the authentication unit 201.

The alarm unit 203 alarms through a sound, a screen, and the like when the USB memory 10 is separated from the main computer 1 without undergoing an appropriate removal process. In detail, when the USB memory 10 is detached from the main computer 1 without being removed, the alarm unit 203 may be configured with a buzzer, a siren, a melody, and a voice through a speaker connected internally or externally to the main computer 1. And the like. Through this, the alarm unit 203 informs that the USB memory 10 is being disconnected without proper removal process. In addition, the alarm unit 203 outputs a warning screen or a separate warning window screen through a blinking operation of inverting the icon of the USB memory 10 displayed on the display unit as well as a sound or turning on or off the entire screen. Can be output as a warning screen.

The information posting unit 205 activates personal information stored in the personal information storage area 126 of the CD-ROM area 120. When the USB memory 10 attempts to access the main computer 1, the information posting unit 205 activates the personal information. If the personal information is posted together, or if the USB memory 10 is stolen or lost, the personal information is transferred when the ID / password questioned by the authentication unit 201 is wrong more than a specified number of times. Support recovery.

The log information storage unit 207 stores data access information generated when reading and writing data when reading and writing data on the memory area of the USB memory 10. The log information storage unit 207 is an optional function selected by the owner of the USB memory 10, and records the use file, date and time, read / write status, and password failure date and time.

The memory lock unit 209 prevents access to the general data area 130 and the secure data area 140 by the main computer when the ID / password that is queried by the authenticator 201 fails within a specified number of times.

The general data area 130 is a mass storage area, which is a storage space for storing text, audio, and video files.

The secure data area 140 includes information related to personal details such as a picture of a person or a family picture that the person does not want to disclose to others, an official certificate for internet financial transactions, or a bank account number of a trading bank. It is an area where confidential information that requires encryption, such as financial information related to finance such as passwords, confidential documents of the company or confidential documents that should not be disclosed to others, is stored. In the meantime, when the USB memory 10 is connected to the main computer 1, the secure data area 140 is allocated to the drive after the authentication unit 201 is authenticated without assigning the drive. In addition, even when the USB memory 10 is illegally detached from the main computer 1, the drive of the main computer 1 can be prevented from being allocated to prevent access. That is, the secure data area 140 may not be designated by the user in the stolen USB memory 10.

In the above, the storage system of the USB memory 10 according to the embodiment of the present invention and the anti-theft system stored in each storage area have been described. Hereinafter, the prevention of theft of the USB memory 10 according to the embodiment of the present invention will be described. Let's look at how.

In the following description, a process for reading and writing data to and from the general data area 130 of the USB memory 10 is similar to a general memory approach, and thus a detailed description thereof will be omitted.

4 is a flowchart illustrating a method for preventing theft of the USB memory 10 according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in the method of preventing theft of a USB memory according to an exemplary embodiment of the present invention, first, the USB connector 12 of the USB memory 10 is connected to the USB port of the main computer 1 (S101).

Accordingly, the main computer 1 recognizes the USB device through the USB port scan, and recognizes the USB memory 10 as a mass storage device. In addition, the main computer 1 displays system information transmitted from the system area 110 of the USB memory 10 on the display unit. At this time, the USB memory 10 is assigned to the main computer 1 as a new drive by using the autobooting function of the CD-ROM area 120. After the CD-ROM area 120 is automatically booted into the main computer 1, the personal information stored in the personal information storage area 126, that is, the name, phone number, address, etc. of the owner of the USB memory 10, is displayed. It displays on the display part of 1) (S102). On the other hand, when the USB memory 10 is removed from the main computer 1 through a normal termination process, the personal information stored in the personal information storage area 126, that is, the owner's name, telephone number, The address and the like can be omitted so that they are not displayed.

Next, the CD-ROM area 120 registers the alert application 124 on the RAM of the main computer 1 to activate the alert program (S103).

Next, the reminder program checks the ID / password using the authentication unit 201 (S104).

In step S104, the authentication unit 201 of the reminder program generates a window for asking the ID / password to the main computer 1, and whether the ID / password input from the main computer 1 matches the preset ID / password At this time, if the ID / password is wrong, after requesting the ID / password input the specified number of times (S105), if the ID / password does not match more than the specified number of times to activate the information posting unit 205 The window in which the name, the telephone number and the address are displayed is activated and displayed on the display unit of the main computer 1 (S106). Accordingly, the recovery of the USB memory 10 can be easily performed when the USB memory 10 is lost.

On the other hand, in step S105, if the ID / password is wrong more than a specified number of times, the memory access using the memory lock unit 209 to prevent access to the general data area 130 and the secure data area 140 can be blocked ( S115). The memory lock function is an optional function and can be set during the initialization process of the USB memory 10.

If the ID / password match in step S104, the Notifier program checks whether the USB memory 10 is initialized or not (S107).

In step S107, if a separate initialization process is not performed, the common drive is allocated according to the initial value of the preset USB memory 10 (S108). On the other hand, in step S106, when performing the initialization process, the initial values are modified (109). The initialization process will be described later with reference to FIG. 5.

On the other hand, the USB memory 10, depending on whether or not to use a personal drive (S110), when using a personal drive is assigned a personal drive (S111), if not used to perform a user program (S112).

Next, when access to the data area of the USB memory 10, that is, the general data area 130 and the secure data area 140 occurs according to the use of the user program, and the data read and write operation occurs, log The information storage unit 207 stores log information (S113).

Next, the main computer 1 checks whether the USB memory 10 is connected at a preset time interval, and checks whether the USB memory 10 is connected to the main computer 1 (S114). ).

In step S114, when the USB memory 10 is not connected to the main computer 1, the alarm is alarmed using the alarm unit 203 of the reminder program (S115).

In step S115, the alarm unit 203 alarms according to a preset alarm method. That is, the alarm unit 203 selectively alarms using a sound alarm function such as a relief, a cycle, a melody and a voice, and a video alarm function by changing a screen.

Next, when the USB memory 10 is connected to the main computer 1 in step S114, it is checked whether the USB memory 10 removal request has been notified from the main computer 1 (S116), and the removal request. If received, the notification program is normally terminated through the authentication process (S117).

In step S117, when the USB memory 10 is to be detached from the main computer 1, the Notifier program generates and displays a window for confirming ID / password on the display of the main computer 1, and authentication accordingly. Go through the process. At this time, the USB memory 10 is detached from the main computer 1 without the ID / password authentication process or the USB memory 10 is removed from the main computer 1 even though a request for removing the USB memory 10 from the main computer 1 does not occur. If the USB memory 10 is stolen, the reminder program recognizes that the current USB memory 10 is stolen. That is, the reminder application 124 stored in the USB memory 10 recognizes the current USB memory 10 as stolen when the reminder program is not normally terminated in the previous main computer 1. Accordingly, the reminder application 124 uses the alarm unit 203 to present the current USB memory when the USB memory 10 stolen using the reminder program not normally terminated is used in connection with another main computer 1. By notifying that 10 has been stolen and notifying the phone number and address of the owner of the USB memory 10 by using the information posting unit 205, the recovery of the USB memory 10 is facilitated. The normal termination and abnormal termination of such a reminder program allocates 1 bit to the reminder application 124 of the USB memory 10, and records a value indicating "unused" before the USB memory 10 is used, and the main computer 1 In the case of being used, the value indicating "used" is recorded, and if abnormally terminated during "used", it appears as "used" at the next use, and thus can be recognized as the stolen USB memory 10.

Next, in step S116, if there is no request to remove the USB memory 10, the flow returns to step S112.

5 is a flowchart illustrating a reminder program initialization process of the USB memory 10 according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the initialization process first loads a preset initialization value into the main computer 1 (S201).

In step S201, a window for inputting each setting value described below is generated and displayed on the display unit in the main computer 1.

Next, the user sets the time interval for checking whether the USB memory 10 is connected (S202).

Next, the user determines whether to use a warning sound (S203).

In step S203, the user may hear a buzzer sounding "beep beep" when using a warning sound, a siren generated from a police car or an ambulance, a melody that generates a specific MP3 file or warning sound, or "USB memory has been forcibly removed" or "USB." Please check the connection state of the memory ", such as a preset voice guidance, such as one of a variety of sound options to select and specify (S207).

Next, the user determines whether to use the screen alert (S204).

In step S204, when the user uses the screen warning, the user periodically set the color of the screen being used at regular intervals, and set the blinking operation to periodically turn off the color of the screen being used at regular intervals and the preset One of the separate warning screen outputs is selected and designated (S208). Here, whether the warning sound is used and whether the screen warning is used may overlap.

Next, the user determines whether to specify storage of log information generated according to the access of the data area of the USB memory 10 (S205).

In operation S205, the user may designate storage of several to several tens of log information according to the user's selection when determining to save the log information, and specify to record the date and time and the number of times when the ID / password input fails. (S209). Here, 10 log information may be stored as a default value, and the user may set and specify up to 10 or more available numbers.

Finally, the user inputs personal information of the owner of the USB memory 10, that is, personal information such as a name, a telephone, an e-mail, and an address (S206).

As described above, the anti-theft system and method of the USB memory according to an embodiment of the present invention can alarm when the USB memory connected to the main computer is removed without a proper process.

In addition, the system and method for preventing theft of a USB memory according to an embodiment of the present invention, when the USB memory is lost, writes the owner's name, phone number, address, etc. in the memory area of the USB memory, and separately connects the USB memory to the main computer. By displaying in the window, the USB memory can be recovered.

In addition, the anti-theft system and method of the USB memory according to the embodiment of the present invention can know the usage history of the stolen USB memory by allocating a memory area for recording and storing a log file which is the usage history of the USB memory.

In addition, the anti-theft system and method of the USB memory according to an embodiment of the present invention may provide a lock function that requires input of ID and password when using the stolen USB memory, and restricts the use of other memory when unauthorized use.

Lastly, the system and method for preventing theft of a USB memory according to an exemplary embodiment of the present invention may be configured to prevent a memory format when correct ID and password are not input in order to prevent initialization of the stolen USB memory.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (18)

A USB connector connected to a USB port of the main computer; A memory area for reading and writing data; And A USB controller for controlling access of the memory area from the main computer, The memory area is registered and activated on the main computer, and includes a reminder application to alert the main computer when the USB connector is disconnected from the USB port without performing a USB device removal process. Prevention system. The method of claim 1, The reminder application And an authentication unit for performing an ID and password authentication process for accessing the memory area, and selectively performing an authentication process when the USB connector is separated from the main computer. The method of claim 1, The reminder application And an alarm unit configured to perform at least one of an alarm using sound and an image change in the main computer when the USB device is not removed. The method of claim 3, wherein Alarm using the sound USB memory anti-theft system, characterized in that one of the buzzer, siren, melody and voice guidance. The method of claim 1, And an information posting unit for controlling display of the personal information of the owner of the USB memory on the display unit of the main computer while the USB connector is connected to the main computer. The method of claim 5, The personal information is And at least one of the owner's name, phone number, address, and e-mail. The method of claim 1, And a log information storage unit for storing log information related to reading and writing of the memory area by the main computer. The method of claim 1, When disconnected from the main computer without performing the USB device removal process, And a memory lock configured to restrict access to the memory area. The method of claim 1, The memory area is A system area in which system information is stored; CD-ROM area where autoboot feature is stored; A general data area in which text, audio and video files are stored; And And a secure data area in which secure data requiring security is stored. And the reminder application is located in the CD-ROM area. Connecting a USB connector to the main computer; Activating a reminder program by registering a reminder application stored in a USB memory area on the main computer; And And alerting the main computer when the USB connector is disconnected from the main computer without performing a USB device removal process. The method of claim 10, Authenticating the ID and password for accessing the USB memory by the reminder program. The method of claim 11, The format of the USB memory is USB memory theft prevention method, characterized in that according to the result of the authentication step. The method of claim 10, The USB device removal process Removing the USB memory after terminating the reminder program; and USB memory theft prevention method, characterized in that any one of the process of removing the USB memory in response to the USB device removal request of the main computer. The method of claim 10, The alarming step Alarming a sound including a buzzer, sirens, melody and voice guidance; And And at least one of alarming an image including a sub-window including a pre-stored message. The method of claim 10, And storing log information related to data read and write operations for the USB memory area. The method of claim 10, And displaying the personal information of the owner of the USB memory on the display unit of the main computer. The method of claim 16, The personal information is And at least one of the owner's name, telephone number, address, and e-mail. The method of claim 10, When the USB memory is separated from the main computer without removing the USB device, And a memory locking step of preventing the USB memory from being connected to another main computer to access the memory.

Images