JPH11110273A - Device and method for data management - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to simplify a file data management even when file data are transmitted to a PC or received from the PC. SOLUTION: A CPU reads out file data specified with a file number from a flash memory and reads in a header part of leading 512 bite of the file sequentially from a leading block (step S11). The CPU confirms a file ID, version or the like of an OS header of the header part (step S12). The CPU decides whether there are any problems with contents of the OS header and, when it decides that there are no problems, it removes the OS header of leading 128 bite and writes in, for example, a hard disk, file data having the header part consisting of a file header and an entry list (step S14).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data management device for managing file data in a hierarchical structure using directories.

[0002]

2. Description of the Related Art Conventionally, for example, in a personal computer (hereinafter, referred to as "PC"), various file data are managed by directories. The directory includes attribute information including a file location, a creation date, and the like, and is mainly formed in a hierarchical structure. Each file is usually located at the end of the hierarchical structure and is efficiently classified.

[0003]

At present, an external storage device for storing various types of file data such as still images and sounds has been proposed. Such an external storage device has poor compatibility with an ordinary PC operation system (OS), and cannot directly transmit stored still image and audio file data to the PC.
That is, the external storage device converts file data such as a still image into a format for a PC, and then transmits the converted file data to the PC.

However, when necessary attribute information is moved to a file or transmitted to a PC, such attribute information may be lost or replaced with other attribute information. Has a problem that can not be managed.

It is conceivable that a plurality of locations such as directories, management files, and data files have attribute information on the assumption that files cannot be managed. Is very difficult and impractical.

[0006] The present invention has been proposed in view of such circumstances, and transmits file data to a PC or transmits a file to a PC.
It is an object of the present invention to provide a data management device and a data management method that can easily manage file data even when file data is received from C.

[0007]

In order to solve the above-mentioned problems, a data management device according to the present invention comprises a storage means for storing data, and a first attribute having different standards for managing file data. Receiving means for receiving file data having information and second attribute information, deleting the first attribute information from the received file data, and storing the file data from which the first attribute information has been deleted in the storage means. Management means for performing writing control and managing file data stored in the storage means based on the second attribute information.

[0008] A data management method according to the present invention receives file data having first attribute information and second attribute information having different standards for managing file data. The first attribute information is deleted, the file data from which the first attribute information is deleted is stored, and the stored file data is managed based on the second attribute information.

A data management apparatus according to the present invention transmits a file data having first attribute information and second attribute information having different standards for managing file data, and stores the data. Storage means, receiving means for receiving file data from the transmitting unit, and deleting the first attribute information from the received file data;
A receiving unit having control means for performing control to write the file data from which the first attribute information has been deleted to the storage means, and managing file data stored in the storage means based on the second attribute information; Is provided.

A data management method according to the present invention transmits file data having first attribute information and second attribute information having different standards for managing file data, and receives the transmitted file data. Deleting the first attribute information from the received file data, storing the file data from which the first attribute information has been deleted, and managing the stored file data based on the second attribute information. It is characterized by.

[0011] A data management device according to the present invention comprises: storage means for storing file data having first attribute information;
Management means for managing the file data based on the first attribute information; and transmission means for transmitting data, wherein the management means reads the file data from the storage means, and reads the read file data. And transmitting the file data to which the second attribute information has been added.

A data management method according to the present invention stores file data having first attribute information, manages the file data based on the first attribute information, and reads out the stored file data. The second attribute information is added to the read file data, and the file data to which the second attribute information is added is transmitted.

[0013] A data management device according to the present invention comprises: first storage means for storing file data having first attribute information; and first management for managing the file data based on the first attribute information. Means, and transmitting means for transmitting data, wherein the first management means reads the file data from the storage means, adds second attribute information to the read file data, and transmits the file data. Means are
A transmitting unit that transmits the file data to which the second attribute information is added, a receiving unit that receives the file data from the transmitting unit, a second storing unit that stores the data,
A second management unit that writes the file data received by the reception unit into the second storage unit and manages the file data stored in the second storage unit based on the second attribute information A receiving unit.

A data management method according to the present invention stores file data having first attribute information, manages the file data based on the first attribute information, reads out the stored file data, Adding second attribute information to the read file data, transmitting the file data to which the second attribute information has been added, receiving the transmitted file data, storing the received file data, and storing The file data is managed based on the second attribute information.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

The present invention is applied to the memory card system 1 having the configuration shown in FIG. The memory card system 1
It comprises a host computer 10 and a memory card 20.

As shown in FIG. 1, the host computer 1 stores a hard disk 11 for storing various file data and directory data such as still images and sounds, and a file data from the hard disk 11 and the like. RAM (Random Access Memo)
ry) 12 and a first serial interface (hereinafter, referred to as a “first serial I / F”) 13 for transmitting and receiving data to and from the memory card 20 via three lines.
And a CPU (Central Processing Uni
t) 14, for example, so that file data such as images and sounds stored in the hard disk 11 can be managed in a hierarchical structure using directories.

The RAM 12 is, for example, a hard disk 11
And temporarily supplies the file data to the first serial I / F 13 via a bus as needed.

The first serial I / F 13 transmits data to the memory card 20 via three lines,
The data stored in the memory card 20 is received.
Specifically, the first serial I / F 13 transmits a serial clock SCK at the time of transmitting the control data and the file data via the first line. The first serial I / F 13 outputs a chip select signal CS indicating a state at that time according to switching of serial data such as file data or control data on the first line via the second line. I do. Further, the first serial I /
F13 transmits file data and control data to be written to the memory card 20 via the third line, and receives file data read from the memory card 20.

The CPU 14 controls reading of file data from the RAM 12 and the hard disk 11, writing of file data to the RAM 12 and the like, and controlling transmission and reception of file data and the like to and from the memory card 20.
For example, the CPU 14 issues a register command for determining whether the write protection of an erroneous erasure prevention switch (not shown) of the memory card 20 is turned on, or designates an address to the memory card 20 to specify a predetermined file. Issue a data write instruction.

As shown in FIG. 2, the memory card 20 includes a second serial I / F 21 for serially transmitting and receiving file data and control data from the host computer 1, and a flash memory for storing file data. 22 and a controller 23 that controls reading or writing of file data stored in the flash memory 22.

The flash memory 22 has, for example, an NA
As shown in FIG. 2, file data transmitted from the host computer 1 is divided into blocks each serving as an erasing unit and stored. Each block 0,
Each of 1, 2,..., N is configured by collecting one page (= 512 bytes + 16 bytes) including a data area storing 512 bytes of file data and the like and a 16-byte redundant area. The redundant area stores distributed management information for distributing and managing data in the data area of the block. The distributed management information is, for example,
A block flag indicating a data write status, link information indicating a link destination with another block when a plurality of blocks are linked to form one file, and whether data has been inverted and written in the data area. And the like. The distributed management information is read by the host computer 1 and is used for determining the state of the flash memory 22 when reading / writing data.

Here, the file data includes a user file format such as an image and a sound, and a system file format for system management, and is stored in a data area of one or more blocks of the flash memory 22. You.

The file data in the user file format is
As shown in FIG. 3, it is composed of a 512-byte header part as attribute information and a data part as main information. The header portion includes a 128-byte OS header, which is information for managing the file data in the memory card 20,
It consists of a 240-byte file header, which is general and essential management information, and a 144-byte entry area.

The OS header includes a file ID, a file version, a file size, the number of used blocks, the number of links, a date, a maker /
It has a model code, an initial registration directory number, a search keyword, a file name, and individual data.

The file ID indicates the type of the file, and the file header has the same type. The file version indicates a so-called version number, and indicates the host computer 10 or the memory card 2.
0 is used to determine whether this file data can be processed. The file size indicates the total size of the file data including the header portion and the data portion in bytes. The number of used blocks indicates the number of blocks using the file data in the flash memory 22. The number of links indicates the number of links when file data and other file data are in a reference relationship (linked). Note that the number of links is 1 when no link is made with other file data. The date indicates the date when the file data was created or the date when the file data was updated. The maker / type code indicates the maker name of the device that wrote the file data to the memory card 20 and its model. The initial registration directory number indicates the directory number registered first, and is not updated even when the file data is moved to another directory. The number of registered keywords indicates the number of registered keywords. The keyword character code indicates the character code of the keyword. A plurality of keyword character strings can be specified by determining a keyword and a separator. The file name is P
This is a file name used when managing file data in C10, and is not particularly used in the memory card 20. The 0 reset reserve is always set to 0 at the time of rewriting. The individual data is for managing each file ID, and can be used freely by the user.

As shown in FIG. 5, the file header includes "standard identification data", "file standard identification data", "file ID", "file version", "application creation date", "application Update date "," creation maker / model code "," update maker / model code "," 0 reset reserve ",
It has “number of data entries”, “number of tables”, “character code”, and “title character string”.

"Standard identification data" indicates that the flash memory 22 stores file data in accordance with a predetermined standard. “File standard identification data” indicates that the file data has been created in accordance with the predetermined standard. "File ID"
Indicates the type of the file, and the OS header has the same type. “File version” indicates a version number. The “application creation date” indicates the date on which the application was created, and the “application update date” indicates the date on which the application was updated. The “creating maker / type code” indicates the maker that created the file data and its model name, and the “update maker / type code” indicates the maker that updated the file data and its model name. . "Number of data entries"
It indicates the number of entry data described later. The “number of tables” indicates the number of data in the table data area. “Character code” indicates an input character by a predetermined code number. "Title character string" indicates a title character.

The entry area stores data for managing main data (entry data) stored in the data section. Note that the data section can store up to four entry data. That is,
The file data including the header part and the data part is composed of a maximum of four entry data. In FIG. 3, the index data, the image data, and the two auxiliary data are given as examples of the entry data. However, the present invention is not limited to this, and may be other audio data. Therefore, in the entry area, a start address, a size, a type ID, and individual data are stored for each entry data in order to manage the above four entry data.

The file data in the system file format corresponds to, for example, a directory file, and has a different configuration of the header portion than that in the user file format.

The header of the directory file is
As shown in FIG. 6, an OS header, a file header,
It has a system entry list and system information. The OS header and file header are
This is similar to the above-mentioned user file format.

The data section of the directory file has 96 bytes of directory information, group information, and a list of directory entries.

The directory information is shown in FIG.
As shown in the figure, a 2-byte “directory ID”, a 1-byte “target file ID”, a 1-byte “group number”, a 2-byte “parent directory”, a 2-byte “directory number”, and a 2-byte “directory number” Number of files (all files) ", 2-byte" number of target files ", 2-byte" access point ", 2-byte" number of directory entries ", 2-byte" number of directory entries for system ", 2-byte" use " There are data of “the number of system directory entries”, “number of reserved blocks” of 2 bytes, and “number of used blocks” of 2 bytes, and further have an unused area of 72 bytes.

At this time, "directory ID" indicates the type of directory, and "target file" indicates the ID of the target file. The “number of groups” is the number of registered groups, and the “parent directory” indicates the file number of the parent directory. “Number of directories” indicates the total number of directories included, and “number of files (all files)” indicates the number of all files included in the directory. "Number of target files" indicates the number of target files included, and "access point" indicates an access start directory entry. The “number of directory entries” indicates the number of user directory entries in use, and the “number of system directory entries”
Indicates the number of directory entries for the reservation system.
The “number of used system directory entries” indicates the number of directory entries for the system, the “number of reserved blocks” indicates the number of blocks of the flash memory 22 that the application wants to reserve, and the “number of used blocks” indicates the number of blocks used by the application.

As shown in FIG. 8, the group information includes a 1-byte "group number", a 1-byte "group information size", a 2-byte "directory ID", a 1-byte "0 reset reserve", and a 3-byte "Reserve", 8-byte "date",
It has 8 bytes of “individual information” and an arbitrary number of bytes of “title”. The “group information size” indicates the size of the group information, and has a fixed length of 24 bytes plus an arbitrary number of bytes of “title”. “Directory ID” is an ID assigned to each directory type, and “0 reset reserve” is always set to 0 when it is corrected.
“Reserve” is set to 0 when the file is created. "Date" indicates the creation date of the file, which can be changed by the user. "Individual information" is not particularly defined, and "Title" indicates the title of the directory file.

The directory entry list is composed of a plurality of directory entries for managing part of attribute information of user file format file data.
One directory entry is 4 bytes.

As shown in FIG. 9, one directory entry includes a 2-byte "file number" and "attribute information".
And a “group number”.

The file number is 2 as shown in FIG.
The first bit in the byte has a "0" and the remaining 15
Bits indicate the starting logical address of the file or directory. When “0xffff” is indicated, it means that it is not used.

As shown in FIG. 11, the attribute information has information of "directory / file", "target flag", "mark 1", "mark 2", and "continuous recording". In the "directory / file", when it is 1, it indicates that there is another directory below the directory, and when it is 0, it indicates that there is a file. In the “target flag”, when it is 1, it indicates that the file is the file of the target file ID specified by the directory information, and when it is 0, it indicates that it is other file data. In the case of "mark 1", 1 indicates that there is a mark 1 designation, and 0 indicates that there is no such designation. "Mark 2" is the same as "mark 1". “Mark 1” and “Mark 2” are marking flags that can be specified by the user. In "continuous recording", 00 indicates a normal file, 11 indicates a leading continuous file, and 10 indicates a continuously designated file.

As shown in FIG. 12, the "group number" is a group number represented by 8 bits and indicating one pseudo layer.

In the memory card system 1 configured as described above, for example, the user
When the user operates the operation unit (not shown) and selects predetermined image file data, the CPU 14 of the host computer 10 proceeds to FIG.
The image file data is read in accordance with the processing in steps S1 to S7 shown in FIG.

In step S1, the CPU 14 reads the file data specified by the file number from the flash memory 22, reads the header of the first 512 bytes of the file in order from the first block, and proceeds to step S2.

In step S2, the CPU 14 checks the file ID, version, and the like of the OS header in the header section, and proceeds to step S3.

In step S3, the CPU 14 may not be able to process the file data depending on the type and version of the file data. When it is determined that there is no problem, the process proceeds to step S4, and when it is determined that there is a problem, reading of the file data is stopped.

In step S4, the CPU 14 reads the number of data entries and the number of tables of the file header in the header section, and proceeds to step S5.

In step S5, the CPU 14 reads out the image entries and the individual data of the entry list in the header section, and proceeds to step S6.

In step S6, the CPU 14 determines whether or not there is any problem in the contents of the file header and the contents of the entry list. Stop reading file data.

In step S7, the CPU 14 reads image file data of the data area size indicated by the entry from the memory card 20, displays an image based on the image file data on a display unit (not shown), and ends the processing.

When copying the image file data of the image displayed in this way to, for example, a host computer, the CPU 14 performs the processing of steps S11 to S14 shown in FIG.

At step S11, the CPU 14
The file data specified by the file number is read from the flash memory 22, the header of the first 512 bytes of the file is read in order from the first block, and the process proceeds to step S12.

In step S12, the CPU 14
After confirming the file ID, version, etc. of the OS header in the header section, the process proceeds to step S13.

In step S13, the CPU 14
It is determined whether or not there is a problem in the contents of the OS header. If it is determined that there is no problem, the process proceeds to step S14.

In step S14, the CPU 14
The first 128 bytes of the OS header are removed, and file data having a header portion including a file header and an entry list is written to the hard disk 13, for example.

Thus, the file data stored in the flash memory 22 of the memory card 20 is written to the hard disk 11 of the host computer 10 via the second serial I / F 21 and the first serial I / F 13.

The CPU 14 reads a directory file from the memory card 20 to read the directory file from the PC.
The image file data stored in the ten hard disks 11 can be easily managed. At this time, since the directory file has data indicating a plurality of file numbers and file types as described above, it is possible to manage the file data corresponding to the file number of the directory file as a group. The attribute information of these file data can be obtained from the header part.

For example, the CPU 14 arranges the file or directory in the hierarchy one level below the one directory based on the leading logical address of the file or directory indicated in the list of directory entries in one directory file. I do. In addition, this 1
Further hierarchical structures can be built based on the directory files of the directories of the next lower level.

The file data written on the hard disk 13 has a file header which is attribute information of the file data. Therefore, the host computer 10 does not need to have attribute information such as a creation date and a maker / model code of the file data belonging to the directory in the directory as in the related art. That is, if the directory is provided with the file number of the file data belonging to the directory, the desired attribute information can be recognized based on the file header of the file data.

Thus, for example, even if a certain directory is destroyed, a directory can be created again based on the header information of the file data belonging to the destroyed directory, and the file data becomes unusable. That can be avoided. For example,
The CPU 14 can search for file data of the same type based on the file ID of the file header, or search for file data having the same application update date and update maker / model code, and combine the searched file data in one directory. .

Further, when transmitting the file data stored in the memory card 20 to the host computer 10, the trouble of converting the file data into a predetermined format can be omitted.

Further, since the directory only needs to have at least the file number and the attribute information of 1 byte, the data required for the directory can be made very small as compared with the prior art. Therefore, even if the file data is moved alone, the attribute information is not lost.

Next, the processing of the CPU 14 when copying file data from the host computer 10 to the memory card 20 will be described with reference to FIG.

At step S21, the CPU 14
For example, file data is read from the hard disk 13 and stored in the RAM 12, the first 384 bytes of the file data are read, and the process proceeds to step S22.

In step S22, the CPU 14
File version and file ID of file header
And proceeds to step S23.

In step S23, the CPU 14
It is determined whether the file data is not a target. If it is determined that the file data is not a target, the process proceeds to step S24. If it is determined that the file data is not a target, the transmission of the file data to the memory card 20 is stopped.

In step S24, the CPU 14
The storage location in the flash memory 22 corresponding to the file ID is selected, an OS header is created based on the file header, the OS header is added to the file data, and the file data is transmitted to the memory card 20, and the process ends.

That is, the CPU 14
By adding an OS header, which is information necessary for use in the file 0, to the file data, the trouble of converting the file data into a format corresponding to the memory card 20 can be omitted.

On the other hand, in the memory card 20, the controller 23 transfers the file data from the host computer 10 to the flash memory 2 based on the OS header.
Write to 2. Specifically, the controller 23
Based on the “file size”, “number of used blocks”, and the like of the header, control is performed to secure and write the area of the file data including the OS header.

As described above, according to the present invention, when file data is transmitted / received between the host computer 10 and the memory card 20, the file data can be exchanged by simply adding or deleting the OS header. The trouble of converting to correspond to the format can be omitted.

Since each file data has attribute information corresponding to each of the host computer 10 and the memory card 20, it is possible to prevent the attribute information from being missing even if the file data moves alone. it can.

The present invention is not limited to the transmission and reception of data with the memory card 20 as shown in the present embodiment, but can be applied to the transmission and reception of data by a general-purpose computer. Of course.

[0071]

According to the data management apparatus and the data management method of the present invention, the first attribute information is deleted from the received file data, and the file data is managed based on the second attribute information. This saves time and effort for converting the file data, and does not cause the second attribute information to be lost even when the file data is moved.

According to the data management apparatus and the data management method according to the present invention, the first file is received from the received file data.
By deleting the attribute information and managing the file data based on the second attribute information, there is no need to convert the file data when transmitting or receiving.
Further, the second attribute information is not lost even when the file data is moved.

According to the data management device and the data management method according to the present invention, by adding the second attribute information to the read file data and transmitting the file data, the file data is transmitted at the time of transmission. This eliminates the need for conversion, and can prevent the second attribute information from being lost even if the file data is moved alone.

According to the data management device and the data management method according to the present invention, the second file is added with the second attribute information to the read file data, and the file data is transmitted. This eliminates the need to convert the file data, and prevents the second attribute information from being lost even when the file data is moved alone.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a memory card system to which the present invention is applied.

FIG. 2 is a diagram for explaining a configuration of data stored in a flash memory in a memory card of the memory card system.

FIG. 3 is a diagram for explaining a configuration of file data stored in the flash memory.

FIG. 4 is a diagram for explaining a configuration of an OS header of the file data.

FIG. 5 is a diagram for explaining a configuration of a file header and an entry area of the file data.

FIG. 6 is a diagram for explaining a configuration of a directory file.

FIG. 7 is a diagram for explaining the structure of directory information of the directory file.

FIG. 8 is a diagram for explaining the structure of group information of the directory file.

FIG. 9 is a diagram for explaining a configuration of a directory entry of the directory file.

FIG. 10 is a diagram for explaining a file number of the directory entry.

FIG. 11 is a diagram for explaining attribute information of the directory entry.

FIG. 12 is a diagram for explaining a group number of the directory entry.

FIG. 13 is a flowchart illustrating an operation of a CPU when reading image file data stored in a memory card and displaying an image on a host computer.

FIG. 14 is a flowchart illustrating an operation of a CPU when copying image file data from a memory card to a host computer.

FIG. 15 is a flowchart illustrating an operation of a CPU when copying image file data from a host computer to a memory card.

[Explanation of symbols]

1 memory card system, 10 host computer, 11 hard disk, 12 RAM, 13 first
Serial I / F, 14 CPU, 20 memory card, 21 second serial I / F, 22 flash memory, 23 controller

Claims (22)

[Claims] Storage means for storing data; receiving means for receiving file data having first attribute information and second attribute information having different standards for managing file data; The first attribute information is deleted from the data, and control is performed to write the file data from which the first attribute information has been deleted to the storage means. A data management device comprising: a management unit that manages data. 2. The storage unit stores a directory file indicating a directory to which file data belongs. The management unit stores the directory file based on a directory hierarchical structure based on the directory file and the second attribute information. 2. The data management device according to claim 1, wherein affiliations are managed. 3. When the directory file stored in the storage means is destroyed, the management means reconstructs the hierarchical structure of the directory based on the second attribute information. The data management device according to claim 2. 4. Receiving file data having first attribute information and second attribute information having different standards for managing file data, and deleting the first attribute information from the received file data. A data management method comprising: storing file data from which first attribute information has been deleted; and managing the stored file data based on the second attribute information. 5. A storage device for storing a directory file indicating a directory to which file data belongs, and managing file data belonging to a directory hierarchical structure based on the directory file and the second attribute information. Item 4. The data management method according to Item 4. 6. The data management method according to claim 5, wherein when the stored directory file is destroyed, a hierarchical structure of the directory is reconstructed based on the second attribute information. . 7. A transmission unit for transmitting file data having first attribute information and second attribute information having different standards for managing file data, a storage unit for storing data, and the transmission unit Receiving means for receiving the file data from the first file, deleting the first attribute information from the received file data, writing the file data with the first attribute information deleted to the storage means, And a management unit that manages the file data stored in the storage unit based on the attribute information. 8. The transmitting unit transmits a directory file indicating a directory to which the file data belongs, and the managing unit of the receiving unit determines a directory hierarchical structure based on the directory file and the second attribute information. 8. The data management device according to claim 7, wherein the data management unit manages the affiliation of the file data. 9. When the directory file stored in the storage unit of the receiving unit is destroyed, the managing unit of the receiving unit reconstructs the hierarchical structure of the directory based on the second attribute information. 9. The data management device according to claim 8, wherein the data management is performed. 10. Transmitting file data having first attribute information and second attribute information having different standards for managing file data, receiving the transmitted file data, and A data management method comprising: deleting the first attribute information; storing the file data from which the first attribute information has been deleted; and managing the stored file data based on the second attribute information. . 11. A directory file indicating a directory to which the file data belongs is transmitted, the directory file is received, and, based on the received directory file and the second attribute information, file data in a directory hierarchical structure is obtained. 11. The affiliation is managed.
Data management method described. 12. The data management method according to claim 11, wherein when the stored directory file is destroyed, the hierarchical structure of the directory is reconstructed based on the second attribute information. 13. A storage unit for storing file data having first attribute information, a management unit for managing the file data based on the first attribute information, and a transmission unit for transmitting data. The management means reads the file data from the storage means, adds second attribute information to the read file data, and the transmission means transmits the file data to which the second attribute information has been added. A data management device characterized in that: 14. The management means generates second attribute information corresponding to a predetermined standard based on the first attribute information, and adds the second attribute information to the read file data. The data management device according to claim 13, wherein: 15. File data having first attribute information is stored, the file data is managed based on the first attribute information, the stored file data is read, and the read file data is read. A file management method comprising: adding second attribute information to a file; and transmitting the file data to which the second attribute information is added. 16. A method for generating second attribute information conforming to a predetermined standard based on the first attribute information, and adding the second attribute information to the read file data. The data management method according to claim 15. 17. A first storage unit for storing file data having first attribute information, a first management unit for managing the file data based on the first attribute information, and transmitting the data. Transmission means, wherein the first management means reads the file data from the storage means, adds second attribute information to the read file data, and the transmission means A transmitting unit that transmits the file data to which the attribute information has been added; a receiving unit that receives the file data from the transmitting unit; a second storing unit that stores the data; A receiving unit having a second management unit that writes the data in the second storage unit and manages the file data stored in the second storage unit based on the second attribute information. Data management device. 18. The first management means of the transmission section generates second attribute information that matches a predetermined standard based on the first attribute information, and stores the second attribute information in the read file data. 18. The method according to claim 17, wherein the attribute information is added.
Data management device as described. 19. The control unit according to claim 1, wherein the first management unit of the transmission unit controls the data area information indicating the data amount of the file data stored in the first storage unit to be added to the file data as second attribute information. 2. The second management means of the receiving unit secures a data area of the second storage means and writes the file data based on the second management information.
7. The data management device according to 7. 20. storing file data having first attribute information; managing the file data based on the first attribute information; reading the stored file data; Adding the second attribute information; transmitting the file data to which the second attribute information is added; receiving the transmitted file data; storing the received file data; 2. A data management method, wherein the data management is performed based on the second attribute information. 21. A method for generating second attribute information conforming to a predetermined standard based on the first attribute information, and adding the second attribute information to the read file data. The data management method according to claim 20. 22. Data area information indicating the data amount of the stored file data is added to the file data as second attribute information, and the data of the second storage means is stored based on the second management information. 21. The data management method according to claim 20, wherein an area is secured and the file data is written.