JP4826201B2 - Relay device, storage device, and storage system - Google Patents

Description

  The present invention relates to a relay device for connecting a memory card to a terminal device via a wired interface and to a wireless device via a wireless line, or a memory connected to the terminal device via a wired interface and connected to the wireless device via a wireless line. The present invention relates to a storage system having any one of the devices.

  Conventionally, a memory card containing a flash memory (for example, Memory Stick (trademark), SD card (trademark), etc.) is connected to a terminal device via a wired interface or selectively connected to a wireless device via a wireless line, A relay device that reads and writes file data between a terminal device or a wireless device and a memory card has been developed, and there is a known example of an invention name “adapter device and memory device” using the relay device (Patent Document 1).

  FIG. 7 is a block diagram showing a simplified configuration of a storage system using the relay device shown in the above-described known example. This storage system is configured to include a relay device 1, a wireless device 2, and a terminal device 3 in which a memory card is detachably mounted. The relay device 1 and the terminal device 3 are connected by a wired interface 5, and the relay device 1 And the wireless device 2 are connected by a wireless line 8.

  The RF function unit 11 and the communication control function unit 12 of the relay device 1 have an RF function and a baseband function for performing wireless communication with the wireless device 2. The device function unit 13 controls the communication control function unit 12 to perform connection / disconnection processing with the wireless device 2. In addition, the device function unit 13 controls the memory card control function unit 14 in response to the request 41 for the memory card received from the wireless device 2, acquires memory data from the memory card 6, constructs a response 42, and wirelessly Transmit to device 2. The memory card control function unit 14 has a memory card interface 7 similar to the wired interface 5 between the terminal device 3 and the relay device 1, and relays file data between the terminal device 3 and the memory card 6.

  The RF function unit 21 and the communication control function unit 22 of the wireless device 2 have an RF function and a baseband function for performing wireless communication with the relay device 1. The host function unit 23 controls the communication control function unit 22 to perform connection / disconnection processing with respect to the relay device 1. In addition, the host function unit 23 transmits a request 41 for memory data and receives a response 42 with the relay device 1, and performs a file construction process (file system process) on the transmitted / received file data. . Also, application processing using files is performed.

  The terminal device 3 reads / writes file data from / to the memory card 6 via the relay device 1 from the memory card control function unit 32. The terminal function unit 31 performs file system processing on the read / written memory data and performs application processing using the file. With the above operation, the file data written from the terminal device 3 to the relay device 1 can be read out by the wireless device 2 in a non-contact manner or remotely. In addition, file data that is contactlessly or remotely written from the wireless device 2 to the relay device 1 can be read by the terminal device 3.

FIG. 8 is a block diagram showing a simplified configuration of a storage system using the storage device shown in the above-described known example. In this example, the configuration is the same as that of the system shown in FIG. 7 except that the memory device (flash memory) 16 is fixedly installed in the storage device 4, and the same operation is performed.
JP 2004-334005 A

  In the conventional relay device 1 and the storage device 4 as described above, the terminal device 3 reads the file data to the memory card 6 mounted in the relay device 1 or the memory device 16 built in the storage device 4. When performing, the terminal device 3 first reads table information (Fail Allocation Table: FAT information) indicating the directory arrangement of the file as an initial process of the file system. Further, when a file is written from the terminal device 3, the file information is written and the FAT information is updated, and the FAT information is kept consistent between the terminal device 3 and the memory card 6 or the memory device 16.

  However, if the file data and FAT information in the memory card 6 or the memory device 16 are rewritten by the wireless device 2, the terminal device 3 cannot know that fact. Accordingly, the FAT information held by the terminal device 3 and the FAT information held by the memory card 6 or the memory device 16 cannot be matched. Thereafter, the terminal device 3 correctly reads / writes file data from / to the memory card 6 or the memory device 16. There is a problem that it becomes impossible to do. In order to read and write the file correctly in such a situation, the terminal device 3 needs to restart the file system process and reacquire FAT information.

  The present invention has been devised in view of the above circumstances, and an object of the present invention is to read / write data from a terminal device to a memory card or memory device even after the access to the memory card or memory device from a wireless device. An object of the present invention is to provide a relay device and a storage device that can always be operated normally, and to provide a storage system having either one of the relay device or the storage device.

To achieve the above Symbol purposes, the relay apparatus of the present invention, equipped with a memory card removable relay when reading and writing file data through a wired interface from the terminal apparatus to the memory card, or in the memory card A relay device that relays when reading / writing file data from / to a wireless device via a wireless line, detecting means for detecting completion of writing of file data to the memory card of the wireless device, and writing of the file data A notification means for generating a notification signal when the end is detected and transmitting the notification signal to the terminal device via the wired interface; and when the notification signal is transmitted from the memory card, the terminal device get the file management data via the wired interface, the notification signal generated by the notification means When the end of writing the file data is detected using the same detection signal for the terminal device to detect that the memory card has been removed, the notification signal is sent regardless of whether the memory card is attached. And the notification signal is transmitted to the terminal device via a card detection pin constituting the wired interface .

In addition, the relay device of the present invention is equipped with a removable memory card and relays when reading / writing file data from / to the memory card via a wired interface, or a wireless line from the wireless device to the memory card. A relay device that relays when reading and writing file data via the wireless device, and detecting means for detecting the start or stop of access to the memory card of the wireless device, and the start of access to the memory card are detected Then, a first notification signal is generated and transmitted to the terminal device via the wired interface, or when a stop of access to the memory card is detected, a second notification signal is generated. Notification means for transmitting to the terminal device via the wired interface, wherein the terminal device provides the second notification. When No. is transmitted, via the wired interface from the memory card to get the file management data, it is the terminal apparatus until receiving the second notification signal from the reception of the first notification signal During this time, the memory card is not accessed.

The storage device of the present invention has a built-in memory device, and file data is read from and written to the memory device via a wired interface from the terminal device, or file data is read from and written to the memory device via a wireless line from a wireless device. And a detection means for detecting start or stop of access of the wireless device to the memory device, and a first notification signal is generated when the start of access to the memory device is detected. When this is transmitted to the terminal device via the wired interface or when access to the memory device is detected to be stopped, a second notification signal is generated and transmitted to the terminal device via the wired interface. A notification means for transmitting, and the terminal device transmits the second notification signal. Get the file management data via the wired interface from the memory device, the said terminal until receiving the second notification signal from the reception of the first notification signal, the access to the memory device Do not do .

Also, the storage system of the present invention includes a relay device for mounting a removable memory card, a terminal device for reading and writing file data via the wired interface and the relay device to the memory card, a wireless line and the relay for the memory card. A storage system including a wireless device for reading and writing file data via a device, wherein the relay device detects a writing end of writing of file data to the memory card of the wireless device, and writes the file data A notification means for generating a notification signal when the end is detected and transmitting the notification signal to the terminal device via the wired interface; and when the notification signal is transmitted from the memory card, the terminal device obtaining file management data through the wired interface and the relay device The notification signal generated by the notification means is the same as the detection signal for the terminal device to detect that the memory card has been removed, and when the end of writing the file data is detected, A notification signal is generated regardless of the mounting of the memory card, and the notification signal is transmitted to the terminal device via a card detection pin constituting the wired interface .

  The relay device according to the present invention also includes a detecting means for detecting start or stop of access to the memory card of the wireless device, and a first notification signal when the start of access to the memory card is detected. Generated and transmitted to the terminal device via the wired interface, or when a stop of access to the memory card is detected, a second notification signal is generated, which is transmitted to the terminal via the wired interface. Notification means for transmitting to the device, and the terminal device acquires file management data from the memory card via the wired interface when the second notification signal is transmitted.

According to the present invention, when a wireless device finishes writing file data to a memory card or memory device in a relay device or storage device that constitutes a storage system, this is detected and notified to the terminal device (notification signal). The terminal device that has received this notification obtains file management data (for example, FAT) from the memory card or memory device and always has the latest file management data, so that the terminal device and the memory card or memory device In order to always maintain the consistency of file management data between the devices, always read and write the data of the terminal device to the memory card or memory device normally after accessing the memory card or memory device from the wireless device Can do.
The notification signal is the same as the detection signal for the terminal device to detect that the memory card has been removed. When the end of writing the file data is detected, the notification signal is sent to the memory card. The number of pins that are the wired interface between the memory card and the terminal device is generated by transmitting the notification signal to the terminal device via the existing card detection pin that constitutes the wired interface, regardless of the mounting. The above effects can be obtained without change.

  The purpose of the relay device or storage device constituting the storage system is to always allow the terminal device data to be normally read from and written to the memory card or memory device even after the wireless device has accessed the memory card or memory device. When the wireless device finishes writing the file data to the memory card or memory device, it detects this and notifies the terminal device (notification signal), and the terminal device receiving this notification manages the file from the memory card or memory device. Acquire data (for example, FAT) and always have the latest file management data to always maintain the consistency of the file management data between the terminal device and the memory card or memory device. Is a detection signal for the terminal device to detect that the memory card has been removed. When the end of writing of the file data is detected, this notification signal is generated regardless of the mounting of the memory card, and the notification signal is generated by the existing card detection pin constituting the wired interface. This is realized by transmitting to the terminal device via the.

  FIG. 1 is a block diagram showing a configuration of a storage system according to the first embodiment of the present invention. However, the same parts as those in the conventional example will be described with the same reference numerals. The storage system is configured to include a relay device 1, a wireless device 2, and a terminal device 3 in which a memory card is detachably attached. The relay device 1 and the terminal device 3 are connected by a wired interface 5, and the relay device 1 The wireless device 2 is connected by a wireless line 8. Note that the relay device 1 takes the form of an adapter for a memory card to be attached to the terminal device 3, for example.

  The relay device 1 includes an RF function unit 11 having an RF function for performing wireless communication with the wireless device 2, a communication control function unit 12 having a baseband function for performing wireless communication with the wireless device 2, and a communication control function unit 12. Device function unit 13 for controlling connection and disconnection with the wireless device 2 and a memory card control function for reading and writing file data to and from the memory card 6 in response to requests from the wireless device 2 and the terminal device 3 The apparatus function unit 13 includes a notification function unit 131 that is a main part of the present invention.

  The wireless device 2 includes an RF function unit 21 having an RF function for performing wireless communication with the relay device 1, a communication control function unit 22 having a baseband function for performing wireless communication with the relay device 1, and the communication control function unit. 22 is connected to and disconnected from the relay device 1, the request 41 for the memory data is transmitted to the relay device 1, and the response 42 is received. A host function unit 23 that performs file construction processing (file system processing) and performs application processing using the file.

  The terminal device 3 includes a memory card control function unit 32 that reads / writes memory data from / to the memory card 6 via the relay device 1, performs file system processing on the read / written memory data, and uses a file It has a terminal function unit 31 that performs processing.

  Next, the operation of this embodiment will be described. In the storage system configured as described above, the file data written from the terminal device 3 to the relay device 1 is read out by the wireless device 2 in a non-contact manner or remotely. Also, the file data read from the wireless device 2 in a contactless or remotely manner to the relay device 1 is read by the terminal device 3. At that time, even after file data is written to the memory card 6 by the relay device 1, the relay device has a function for allowing the terminal device 3 to always read and write file data to and from the memory card 6 normally. This is performed by a notification function unit 131 provided in one apparatus function unit 13.

  The notification function unit 131 is arranged in the device function unit 13 of the relay device 1, generates a notification signal (Low-High electric pulse signal) to the terminal function unit 31 of the terminal device 3, and passes through the wired interface 5. Send. The terminal device 3 restarts the file system process for the received notification signal. In order not to add a new pin in the memory card interface between the relay device 1 and the terminal device 3, the above operation is performed using a notification signal similar to an existing card detection signal. In this embodiment, a case where a memory stick is used as the memory card 6 will be described.

  FIG. 2 is a diagram showing an example of terminals for electrical connection between the memory card 6 and the terminal device 3. The card detection signal pin 601 of the memory card 6 is connected to the GND pin 602. On the other hand, in the terminal device 3, the card detection signal pin 301 is pulled up by a resistor and connected to the terminal function unit 31. Therefore, when the memory card 6 is not attached to the terminal device 3, the level of the card detection signal pin 301 connected to the terminal function unit 31 is high. On the other hand, when the memory card 6 is attached to the terminal device 3 and each pin is electrically connected, the level of the card detection signal pin 301 indicates a low level.

  In this manner, the terminal function unit 31 of the terminal device 3 can determine whether the memory card 6 is inserted or removed based on the level of the card detection signal pin 301. Normally, the terminal function unit 31 supplies power to the power supply pin 302 when it is determined that the memory card 6 is inserted, and stops supplying power when it is determined that the memory card 6 is removed.

  FIG. 3 is a diagram illustrating a terminal configuration example of the relay device 1 and the memory card 6 when the memory card 6 is attached to the terminal device 3 via the relay device 1. The terminal configuration of the relay device 1 is the same as the terminal configuration of the memory card 6, and the card detection signal pin 101 is connected to the notification function unit 131. As a result, the notification function unit 131 can actively set the card detection signal pin 101 to the high level. Therefore, even if the memory card 6 is not removed, the card detection signal can be seen to be at a high level when viewed from the terminal device 3 side, and it can appear to the terminal device 3 that the memory card 6 has been removed in a pseudo manner. . When this happens, the terminal device 3 stops supplying power to the relay device 1, and accordingly, the card detection signal pin 101 changes to the low level again. As a result, the terminal device 3 appears to have the memory card 6 attached, and the power is turned on again. In response to the memory card 6 being mounted again, the terminal device 3 reads memory data (FAT) from the memory card 6 and performs file system processing.

  Next, the overall operation of the storage system of this embodiment will be described with reference to the sequence diagram of FIG. In step 500, the terminal device 3 turns on power to itself and the relay device 2. After the power is turned on, the terminal device 3 acquires FAT information from the memory card 6 as an initial process of the file system process in step 501. The address of the FAT information is grasped in advance by the terminal device 3 side, the address is designated for the memory card 6 and the memory data is read in a predetermined unit. At this time, the relay device 2 relays and reads out the memory data between the terminal device 3 and the memory card 6.

  The terminal device 3 that has acquired the FAT information grasps the directory configuration and file arrangement in the memory card 6. When reading the file, the FAT information is referred to, and the memory data constituting the file is sequentially obtained to construct the file. When writing a file to the memory card 6, the memory data constituting the file is sequentially written, and the memory data constituting the updated FAT information is written into the memory card 6.

  In order to access the memory card 6 from the wireless device 2 via the relay device 1, first, wireless communication connection processing is performed between the wireless device 2 and the relay device 1. In the present embodiment, the wireless communication system is not particularly limited, but a connection-type wireless communication system is assumed. In step 401, the wireless device 2 requests connection to the relay device 1. In step 402, the relay device 1 returns a connection response to the wireless device 2.

  The wireless device 2 also acquires FAT information from the memory card 6 via the relay device 1 as an initial process of file system processing. Between the relay device 1 and the wireless device 2, a request and response format for reading / writing memory data in the memory card 6 is defined. In this case, in step 411, the wireless device 2 designates the address of the FAT information and requests the relay device 1 to read the memory data. In step 701, the relay device 2 receives the request and reads memory data at a predetermined address from the memory card 2. In step 421, the relay device 2 transmits the memory data read out as a memory data read response to the wireless device 2.

  The wireless device 2 obtains FAT information and configures a directory in the memory card 6 to grasp the file arrangement. When the wireless device 2 writes the file to the memory card 6, after the memory data write request is sent to the relay device 2 in step 412, the memory data constituting the file and the memory data constituting the FAT information are sequentially transferred to the relay device 1. It is done by transferring to. In response to the memory data write request issued from the wireless device 2, the relay device 1 writes the memory data to the memory card 6 in step 702, and returns a success / failure response in step 422.

  Thereafter, the end of writing of the memory data by the wireless device 2 is performed when the disconnection is completed. After completing the file processing, the wireless device 2 requests the relay device 1 to disconnect in step 403. In response to this, the relay apparatus 1 sends a disconnection response to the wireless apparatus 2 in step 404. At the same time as the disconnection response, the relay device 1 generates a notification signal for notifying the terminal device 3 of the disconnection of the wireless device 2 in step 510 and sends it to the terminal device 3 via the wired interface 5. In other words, the notification function unit 131 of the relay device 1 actively makes the card detection signal pin 101 high to make it appear to the terminal device 3 that the memory card 6 has been removed in a pseudo manner. In response to this notification signal, the terminal device 3 restarts the file system processing, and re-acquires the memory data constituting the FAT information from the memory card in step 501.

  According to the present embodiment, when the relay device 1 writes data to the memory card 6, the notification function unit 131 actively sets the card detection signal pin 101 to the high level so that the memory card 6 is simulated in the terminal device 3. By pretending that the terminal device 3 has been removed, the terminal device 3 restarts the file system processing in response to the trigger signal and re-acquires file data constituting the FAT information from the memory card 6. Even after access to the file, it is possible to always read and write file data to the memory card 6 normally. In addition, since the notification signal is sent from the relay device 1 to the terminal device 3 using the card detection signal pin 101 of the memory card 6, the above effect can be obtained without adding a new pin to the memory card 6. it can.

  In addition, the relay device 1 generates a notification signal to be transmitted to the terminal device 3 separately from the card detection signal at the same time as a disconnection response to the wireless device 2, and this is generated via a newly provided pin or signal line. The terminal device that has received the notification signal and transmitted to the device has the same effect in the configuration in which the FAT information is obtained from the memory card by restarting the file system processing. In this case, however, the modification of the existing memory card ( For example, an additional connection pin is required, and a new signal line (broken line) 9 needs to be wired between the relay device 1 and the terminal device 3.

  FIG. 5 is a sequence diagram for explaining the overall operation of the storage system according to the second embodiment of the present invention. In this case, the device function unit 13 of the relay device 1 of the storage system has a notification function of notifying the terminal device 3 of the period during which the wireless device 2 is accessing the memory device 16. However, it has a signal line 9 (or a new pin) for transmitting a notification signal ON / OFF for notifying the period during which the wireless device 2 is accessing the memory card 6 to the terminal device 3. In this sequence example, the notification signal is an enable signal. The relay device 1 turns the notification signal ON (high level) when the connection with the wireless device 2 is completed, and turns the notification signal OFF (low level) when the disconnection is completed.

  Next, the operation of this embodiment will be described. First, the processing from step 502 to step 402 is the same as that of the first embodiment shown in FIG. In step 402, the relay device 1 returns a connection response to the wireless device 2, and in step 511, for example, sends a high level notification signal ON to the terminal device 3 via the signal line 9. The terminal device 3 recognizes that the wireless device 2 is busy accessing the memory card 6 while receiving the notification signal ON, and refrains from accessing the memory card 6 itself. Thereafter, the processing from step 411 to step 404 is the same as that of the first embodiment.

In step 404, the relay device 1 returns a disconnection response to the wireless device 2, and sends a low level notification signal OFF to the terminal device 3 in step 510. The terminal device 3 restarts the file system processing by using the detection signal of the falling edge of the notification signal as a trigger signal, and re-acquires memory data constituting the FAT information from the memory card 6 in step 501.

  According to the present embodiment, when the wireless device 2 finishes access to the memory card 6, the relay device 1 sets the notification signal transmitted to the terminal device 3 to a low level. Since the file system process is restarted and the memory data constituting the FAT information is reacquired from the memory card 6, the file data is always read from and written to the memory card 6 even after the wireless device 2 accesses the memory card 6. This can be performed and has the same effect as the first embodiment. Further, this notification signal can be handled as a busy signal in which the relay device 1 and the memory card 6 are accessed from the wireless device 2, and the terminal device 3 is busy when the notification signal is at a high level. It is possible to prevent the memory card 6 from being accessed.

  FIG. 6 is a block diagram showing the configuration of the storage system according to the third embodiment of the present invention. In the storage system of the present embodiment, the storage device 4 is wired to the terminal device 3 and is wirelessly connected to the wireless device 2. The storage device 4 has the same memory device 16 as that of the relay device described in the first embodiment, except that the memory device 16 has a built-in memory device 16 and a memory card control function 15 that controls reading / writing of file data to / from the memory device 16. It is a configuration. In the case of a storage system using this storage device 4, the storage device 1 prompts the terminal device 3 to restart the file system processing when the file of the internal memory device 16 is rewritten by the wireless device 2. An effect similar to that of the first or second embodiment is provided by providing the notification means in the apparatus function unit 13 and operating this notification means in the procedure described in the operation sequence of the first or second embodiment. Can be obtained. However, in the case of this storage system, no matter which operation sequence of the first or second embodiment is adopted, a pin or signal line 9 for transmitting a notification signal from the storage device 1 to the terminal device 3 is provided. It becomes necessary newly.

    In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, it can implement also with another various form in a concrete structure, a function, an effect | action, and an effect. For example, as a wireless method between the relay device 1 or the storage device 4 and the wireless device 2, various methods such as Bluetooth can be applied, and wireless communication using infrared rays may be used.

1 is a block diagram showing a configuration of a storage system according to a first embodiment of the present invention. It is the figure which showed the example of a terminal which performs electrical connection with the memory card | curd shown in FIG. 1, and a terminal device. It is the figure which showed the terminal structure example of a relay apparatus and a memory card in the case of mounting | wearing a terminal device with a memory card via a relay apparatus. FIG. 2 is a sequence diagram showing an operation procedure of the storage system shown in FIG. 1. It is a sequence diagram explaining the whole operation | movement of the storage system which concerns on the 2nd Embodiment of this invention. It is the block diagram which showed the structure of the storage system which concerns on the 3rd Embodiment of this invention. It is the block diagram which showed the simple structure of the storage system using the conventional relay apparatus. It is the block diagram which showed the other simplified structure of the storage system using the conventional memory | storage device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Relay device, 2 ... Wireless device, 3 ... Terminal device, 4 ... Storage device, 5 ... Interface, 6 ... Memory card, 8 ... Wireless line, 11, 21 ... RF function part, 12, 22 ... Communication control function part, 13 ... Device function part, 14, 15, 32 ... Memory card control function part, 16 ... Memory device, 23 ... Host function part, 31 ... Terminal function part, 131... Notification function unit, 101, 301, 601... Card detection signal pin, 602.

Claims (5)

When a removable memory card is installed and file data is read from or written to the memory card via a wired interface from the terminal device, or when file data is read from or written to the memory card via a wireless line from the wireless device A relay device for relaying,
Detecting means for detecting completion of writing of file data to the memory card of the wireless device;
A notification unit that generates a notification signal when the end of writing of the file data is detected, and transmits the notification signal to the terminal device via the wired interface;
When the notification signal is transmitted, the terminal device acquires file management data from the memory card via the wired interface ,
The notification signal generated by the notification means is the same as the detection signal for the terminal device to detect that the memory card has been removed, and when the end of writing the file data is detected, the notification A relay device that generates a signal regardless of the mounting of the memory card and transmits the notification signal to the terminal device via a card detection pin that constitutes the wired interface . When a removable memory card is installed and file data is read from or written to the memory card via a wired interface from the terminal device, or when file data is read from or written to the memory card via a wireless line from the wireless device A relay device for relaying,
Detecting means for detecting start or stop of access to the memory card of the wireless device;
When a start of access to the memory card is detected, a first notification signal is generated and transmitted to the terminal device via the wired interface, or when a stop of access to the memory card is detected. Generating a notification signal of 2 and transmitting the notification signal to the terminal device via the wired interface,
When the second notification signal is transmitted, the terminal device acquires file management data from the memory card via the wired interface ,
A relay device in which the terminal device does not access the memory card from the time when the first notification signal is received until the time when the second notification signal is received . A storage device that has a built-in memory device, and file data is read from and written to the memory device via a wired interface, or file data is read from and written to the memory device via a wireless line from a wireless device,
Detection means for detecting the start or stop of access to the memory device of the wireless device;
When a start of access to the memory device is detected, a first notification signal is generated and transmitted to the terminal device via the wired interface, or when a stop of access to the memory device is detected. Generating a notification signal of 2 and transmitting the notification signal to the terminal device via the wired interface,
When the second notification signal is transmitted, the terminal device acquires file management data from the memory device via the wired interface ,
The storage device in which the terminal device does not access the memory device after receiving the first notification signal and before receiving the second notification signal . A relay device to which a removable memory card is attached, a terminal device for reading / writing file data via a wired interface and the relay device to the memory card, and a file data reading / writing to the memory card via a wireless line and the relay device A storage system comprising a wireless device,
The relay device detects a write end of file data to the memory card of the wireless device;
A notification unit that generates a notification signal when the end of writing of the file data is detected, and transmits the notification signal to the terminal device via the wired interface;
When the notification signal is transmitted, the terminal device acquires file management data from the memory card via the wired interface and the relay device ,
The notification signal generated by the notification means is the same as the detection signal for the terminal device to detect that the memory card has been removed, and when the end of writing the file data is detected, the notification signal A storage system that generates a signal regardless of the installation of the memory card and transmits the notification signal to the terminal device via a card detection pin that constitutes the wired interface . The relay device detects a start of access to or a stop of access to the memory card of the wireless device, and generates a first notification signal when the start of access to the memory card is detected. Notification that is transmitted to the terminal device via the wired interface, or generates a second notification signal when stoppage of access to the memory card is detected, and is transmitted to the terminal device via the wired interface Means,
The storage system according to claim 4, wherein the terminal device acquires file management data from the memory card via the wired interface when the second notification signal is transmitted.

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