JPH11175377A - File management method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a file management method for facilitating the group management of plural files stored in plural media or read from the media. SOLUTION: Data for group recognition composed of the time of writing the file in the respective media, a serial number assigned to the media and a number for specifying a loader 1 are written in the respective media A and B and the loader recognizes a group for the respective files and the group for the respective loaders from the data for the group recognition and manages the file. The loader prepares a file storage map for indicating in which medium the file is written, stores it in one medium and recognizes the medium storing the file of the same group by referring to the file storage map.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer for managing a plurality of files used by a PC (programmable controller) or the like, distributing and storing the files in a removable medium, or transferring a part or all of the files from the medium. The present invention relates to a file management method for searching and reading.

[0002]

2. Description of the Related Art When a plurality of files used in a PC are managed by an editing program (hereinafter referred to as a loader) which runs on a computer such as a personal computer for editing the contents of the files, as shown in FIG. The loader sets one of the plurality of files to be edited as a file for registering a file name in a group, associates the file by storing the name of a file to be registered in this file, and treats the entire file as one group of files. . In the figure, the file MAIN.
This is a case where the name of Z.PRG is registered.

Usually, when a file is transferred to a removable medium (such as a floppy disk) by a loader, the loader uses a file copy program or a system call prepared in an operating system to transfer the file to and from the removable medium. To transfer the file.

FIG. 8 shows this writing procedure. This copy command causes the user to select a file to be saved (S1), recognizes the beginning of the selected file (S2), sets a removable medium as a file transfer destination (S3), and stores the file in the removable medium. It is checked whether or not there is free space to be used (S4). If there is free space, a message to replace the medium with an empty medium is displayed (S5). If there is free space, a file is written to the medium (S6), and all files are written. (S7), and if there is any remaining file, the next file is recognized (S8). The file is written while checking whether there is free space in the medium for this file, and all files are written. Copy is completed when writing is completed.
This copy command can be copied only in a range where there is free space for storing files on the medium.

When a file written on a plurality of media is read, the loader program cannot know whether or not the media stores the same group of files. I have.

[0006]

The conventional file management method has the following disadvantages.

(1) It cannot be recognized that a plurality of files in one group are stored separately in a plurality of removable media.

When the capacity of one removable medium is smaller than the total capacity of a plurality of files in a group,
Multiple media are required. In the copy using the normal copy command, the information that the files of the same group are included is not stored, so that the user who uses the loader has to manage it.

(2) If there are two groups of files having the same file and the same size but differing only in their contents, even if a plurality of removable media storing those files are mixed and used erroneously, the loader Side cannot determine the error.

[0010] Since there is no information for recognizing a group, if the contents of the removable medium are the same, only the same group can be seen.

(3) When a plurality of files are stored in a plurality of mediums, it is not easy to know which medium contains each file.

Unless all the media are checked, the media storing the file cannot be specified.

(4) Only some files of the group cannot be read.

Since it is not known on which medium the file to be read is stored, it is necessary to read all the files once.

An object of the present invention is to provide a file management method which facilitates group management of a plurality of files stored in or read from a plurality of media.

[0016]

According to the present invention, a file of the same group stored in a plurality of media is used by using group recognition data attached to each medium or a group storage map including a number specifying a medium and a file name. Automatically manages writing and reading of a file, and is characterized by the following method.

(1st invention) A file management method for distributing and writing a plurality of files to a plurality of media which can be attached to and detached from a computer. The group recognition data consisting of the serial number, the write instruction time to the medium, and the number specifying the computer is written in each medium, and the computer reads each file written to the medium from the group recognition data. The file is managed by recognizing the group and the group for each computer.

(2nd invention) A file management method for distributing and writing a plurality of files to a plurality of the same kind of media which can be attached to and detached from a computer, wherein the computer has a free space per one medium. Create a file storage map composed of file names and group recognition data that can be stored in the medium by calculating from the capacity, store it in one of the media, and write the file to each medium according to the map And the corresponding group recognition data is written, and the computer recognizes the medium storing the files of the same group by referring to the file storage map and reads the file from each medium.

(Third invention) A file management method for distributing and writing or reading a plurality of files to and from a plurality of different types of media that can be attached to and detached from a computer, wherein the computer has a file name and group recognition data A file storage map having an area is created in the work area, and a file is written to each medium by calculating from the free space, and a medium serial number is written to the group recognition data area of the work area and the medium. After the last file has been written, the file storage map is written to one of the media, and the computer recognizes the medium on which the files of the same group are stored by referring to the file storage map, and It is characterized by reading a file from a medium.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A method of recognizing a group of a plurality of media In this embodiment, when storing (writing) a plurality of files forming a group in a plurality of removable media, the method is as follows. This is a method for recognizing that the mediums belong to the same group, which is a solution to the above-mentioned problems (1) and (2).

In this embodiment, data for group recognition is written in each medium when storing a file. This data includes the time (year, month, day, hour, minute, second) at which the user instructed the writing of the PC file, the serial number of the medium, and the product number for specifying the loader, and has the following data structure.

Recognition data = yyyymmdd-hhnnss-ppp
ppp-aaa yyyy = year mm = month dd = day hh = hour nn = minute ss = second For example, a unique value is set for each installed loader. Further, the serial numbers of the media are integers starting with 1, and if there are a plurality of media, they are set in ascending or descending order as 1, 2, 3,...

Instruction time for writing to the medium (year / month / day / hour / minute / second)
Is used to recognize and distinguish a group of media when files of the same group are stored at different times on the same computer.

FIG. 1 shows an example in which group recognition data is added to a medium. In the figure, 18 September 29, 1997
At 24 hours and 32 seconds, loader 1 with product number 012345
The case where the data is stored in ascending order as in the case of the second medium A and the second medium B is shown.

According to this data attaching method, two
Even if the same file is stored by one loader program, different data can be set in the medium.
For example, as shown in FIG. 2, a loader (product number 0000)
01) In step 1, files are stored in groups on media A and B,
At the same time as this storage, loader (product number 000002)
When files are stored in groups on media C and D in 2
Since the product number of the loader is different, it can be recognized as a medium of another group.

The group recognition data is written for each medium in the form of a text file or a binary file. The group recognition data may be any number as long as it is at least a medium serial number, a write instruction time to the medium, and a computer identification number.

(Second Embodiment) Method of Reading and Writing Files to Plural Media In this embodiment, PC files are stored in a plurality of removable media having the same capacity, and some or all of them are stored. Is automatically extracted by a search, and is a solution to the above-mentioned problems (3) and (4).

According to this method, before writing a PC file on a medium, the file to be stored on the medium is calculated from the capacity per medium to determine on which medium the file to be written is written. A table shown below (tentatively referred to as a file storage map) is created and stored in the first medium. The medium used in this method is a medium of the same capacity and the same type.

The file storage map stores, on the loader, a file storage map including a set of the group recognition data excluding the serial number of the medium, the name of the PC file to be stored, and the serial number of the medium storing the file. In advance, and stored in the medium when writing a file to the first medium.

In the example of the file storage map shown in FIG. 3, data is created by using a file name and a medium serial number as a map, and based on the medium serial number obtained by calculation,
The PC file is stored in the corresponding four media A to D. At this time, the file storage map is stored on the first medium.

Thus, when the loader reads a file from the medium A, the loader recognizes that the same group of files divided and stored on the four media exists by referring to the file storage map written therein. it can.

FIG. 4 shows a procedure for writing a PC file. First, a file to be saved is selected (S11), and a file storage map having the group recognition data and the file name excluding the serial number of the medium at the current time is created (S1).
2) Recognize the head of the selected file (S13), initialize the medium serial number to 1 (S14), and set the written capacity to 0 (S15).

Thereafter, it is checked whether or not the value obtained by adding the written capacity and the written file capacity is smaller than the medium capacity (S16), and if it is larger, the serial number is incremented by +1 (S17). If it is smaller, the write file capacity is added to the written capacity (S18), and the file and medium serial numbers are written to the file storage map (S18).
19).

The capacity calculation and the map creation up to now are checked for all the files to be written (S20), and if there are any remaining files, the capacity calculation for the file and the addition to the map are performed (S21).

Next, the loader initializes the serial number of the medium to 1 (S22), and sets the first medium (S2).
3) Write the group recognition data on this medium (S2
4) Write all files corresponding to the current medium serial number on the file storage map to the set medium (S25).

The writing and setting of the file to the medium up to now are performed until the files of all consecutive numbers are stored (S2
6) Repeat while incrementing the media serial number by one (S2)
7).

Next, the reading procedure is shown in FIG. At the time of reading, first, the first medium is set (S3
1) The file storage map stored in this medium is read (S32), and from this file storage map, which file is stored in which serial number of the medium is known, a message is displayed based on this. Then, the user selects a PC file to be read (S33). The read order is rearranged from the selection and the map so that the medium serial numbers corresponding to the files are in ascending order (S34), and the first file after the rearrangement is recognized (S35).

Thereafter, the medium serial number of the file is obtained from the file storage map (S36), and it is checked whether or not the current medium serial number matches the medium serial number of the file (S37). The user is notified that the medium should be replaced with the medium in which the file has been written (S38), and the user is prompted to replace the medium (S39). When the group numbers of the medium match, the PC file is read from the medium (S40).

In this way, all the selected PCs
The application file is read (S41, S42).

(Third Embodiment) A method of writing and reading a file to and from a plurality of media In this embodiment, a PC file is stored in a plurality of removable media having different capacities or types and a part thereof. Alternatively, this is a method for retrieving all by search, which is a solution to the above-mentioned problems (3) and (4).

FIG. 6 shows a procedure for writing a PC file by this method. First, the user selects a file to be saved (S51), and creates a file storage map having a group recognition data area and a file name excluding the serial number of the medium at the current time in the work area (S52). Is recognized (S53). Next, the serial number of the medium is initialized to 1 (S54), and the medium is set (S55).

It is checked whether the serial number of the set medium is 1 or 2 or more (S56). In the case of 1, it is determined whether the value obtained by adding the file storage map capacity and the write file capacity is smaller than the free space of the medium. Is checked (S5
7). If the number is two or more, it is checked whether the write file capacity is smaller than the free medium capacity (S58).

If the file capacity is larger than the free medium capacity in these checks, the user is notified to set an empty medium (S59), and the medium serial number is incremented by one (S6).
0). If it is smaller, the file is written to the medium and the medium serial number is written (S61). These series of processes are continued as long as there are unstored files (S62, S6).
3).

As a result, the serial number of the medium corresponding to the PC file is written in the file storage map secured in the work area of the loader until all the files are stored in the medium. However, in the first medium, the PC file is stored with a space corresponding to the maximum capacity of the file storage map determined from the maximum capacity of the file group. When all the PC files have been stored, a process of writing the file storage map in the work area of the loader to the first medium is performed.

In this method, the PC file is stored while checking the free space of the medium. Therefore, even when the free space differs for each medium or when the type of the medium is different, the medium on which the file is stored is different. You can know.

The reading of the file can be performed in the same manner as in the second embodiment.

In the above embodiments, PC files are described. However, the present invention can be applied to a system or an apparatus in which files are written to or read from a plurality of removable media in a distributed manner.

The file storage map is not limited to being written on the first medium, but may be written on one of the media.

[0049]

As described above, according to the present invention, the same group stored in a plurality of media is used by using group recognition data assigned to each medium or a group storage map including a number specifying a medium and a file name. Is automatically recognized, so that group management of a plurality of files stored in or read from a plurality of media becomes easy. Specifically, the following effects are obtained.

(1) Files in the same group can be easily recognized and managed by the group recognition data.

(2) When a plurality of loader programs run on a computer and a group of files having the same file name and the same size are simultaneously stored in a removable medium, files in different groups can be easily recognized and managed.

(3) Even if a plurality of files in one group are stored in a plurality of removable media, a medium having files of the same group and a file not having the same group can be easily recognized and managed.

(4) Even if a plurality of files in one group are stored in a plurality of removable media, it is possible to determine which medium contains some or all of the files in all media. Can be easily recognized and managed without referring to

(5) The same group of files can be easily recognized and managed on the same type of medium or different types of media.

[Brief description of the drawings]

FIG. 1 is an example of a group identification number indicating an embodiment of the present invention.

FIG. 2 is an example of simultaneous writing of files in the embodiment.

FIG. 3 is an example of a file storage map showing another embodiment of the present invention.

FIG. 4 illustrates a file writing procedure when the same medium is used in the embodiment.

FIG. 5 is a file reading procedure in the embodiment.

FIG. 6 shows a file writing procedure when a different medium is used according to another embodiment of the present invention.

FIG. 7 is a diagram showing a conventional PC file association.

FIG. 8 shows a conventional file storage procedure.

[Explanation of symbols]

 1, 2, loader A to D, removable medium

Claims (3)

[Claims] 1. A file management method for distributing and writing or reading a plurality of files to and from a plurality of media detachable from a computer, comprising: writing a file to each of the media; Group recognition data consisting of a write instruction time on a medium and a number specifying a computer is written on each medium, and the computer reads each group and computer for each file written on the medium from the group recognition data. A file management method for recognizing a group of files and managing the files. 2. A file management method for distributing and writing or reading a plurality of files to and from a plurality of the same kind of media which can be attached to and detached from a computer, wherein the computer calculates a free space per one of the media. A file storage map composed of file names and group recognition data which can be stored in the medium by using the storage medium, and store the file in one of the mediums. A file management method, comprising writing recognition data, the computer recognizing a medium storing files of the same group by referring to the file storage map, and reading the file from each medium. 3. A file management method for distributing and writing or reading a plurality of files to and from a plurality of different types of media that are removable from a computer, wherein the computer has a file having a file name and a data area for group recognition. A storage map is created in the work area, a file is calculated for each medium from its free space, a file is written, and a medium serial number is written to the group recognition data area of the work area and the medium. After writing the file, the file storage map is written to one of the media, and the computer recognizes the medium on which the files of the same group are stored by referring to the file storage map, and reads the file from each medium. A file management method characterized by reading.