JPH03211636A - Method for controlling file of floppy disk - Google Patents

Abstract

PURPOSE:To simplify access for a floppy disk and to reduce a mechanical burden for the disk by controlling files having hierarchy tree structure on a memory in a system. CONSTITUTION:When data in the files stored in the floppy disk 1 are written, the operation of compression is executed in the main memory 2 of a data processor as to a sub-directory and plural files in the control of the sub-directory. The files are made into a package and written as one file (file 2 in this example) in the control of the directory 21 of the floppy disk 1. At the time of reading the file 2, one package which is controlled as one file in the directory 21 is read on the main memory 2, the package is resolved and the target file is read. Thus, access for the floppy disk 1 is simplified and the mechanical burden for the disk can be reduced since the files can be arranged in a comparatively continuous form.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for managing files on a floppy disk.

[Conventional technology]

In recent years, as the capacity of floppy disks has increased, file management methods on floppy disks that have a hierarchical tree structure similar to those found in fixed disk devices are becoming popular. FIG. 5 is an explanatory diagram schematically showing a hierarchical tree structure within a floppy disk. The hierarchical tree structure has a basic (root) directory 11, subordinate files 11-1, subdirectories 12, 13, etc.
There are generally multiple subdirectories 12.
There are also a plurality of files 12-1 to 12-3 (or subdirectories (not shown)) subordinate to 13....

A directory consists of file records in which file names of subordinate files, subdirectories, attributes, etc. are entered, and by concatenating subdirectories and file names from the directory,
The file can be identified.

To access a file managed using the hierarchical book structure described above, first access the basic directory, refer to the pointer indicating the next file or subdirectory from the relevant file record, and then access the relevant file. (or directory). This applies to both floppy disks and fixed disk drives.

[Problem to be solved by the invention]

By the way, in a fixed disk device, in order to achieve high recording density, the disk as a storage medium, a read/write head, a positioning mechanism, etc. are enclosed in a sealed box. Therefore, even if the procedure for accessing files becomes complicated, mechanical reliability is high, and data corruption due to disk crashes is extremely rare.

On the other hand, since floppy disks place emphasis on ease of handling and economic efficiency, their mechanical reliability is lower than that of fixed disks. Therefore, when there are a large number of directories on a disk, access becomes complicated and there is a problem in that data is more likely to be destroyed due to a disk crash.

SUMMARY OF THE INVENTION An object of the present invention is to provide a floppy disk file management method that simplifies access to a floppy disk and reduces mechanical load on the disk.

[Means for Solving the Problem] and [Operation] A floppy disk file management method according to the present invention sets a set of directories for files stored in a floppy disk, and stores files having a hierarchical book structure. It is managed as follows.

First, when writing a file to a floppy disk,
If one file record in the set of directories has a subordinate subdirectory, the multiple files managed in this subdirectory and the subdirectory are packaged in memory within the system, and one Write to floppy disk as a file. Note that if one file record points to only one file, that one file is written to the floppy disk.

Also, when reading a file written on a floppy disk, if the file stored on the floppy disk is a packaged file, the packaged file is expanded to the memory in the system, and the package is executed here. Read the target file by disassembling it.

According to the above file management method, files with a hierarchical book structure are managed in the memory within the system, so file data can be placed consecutively on the floppy disk. access can be simplified.

〔Example〕

An embodiment of the file management method according to the present invention will be described below.

FIG. 2 is a block diagram showing an example of a data processing device for implementing the file management method according to the present invention. This data processing device consists of a CRTI, which is a display device for displaying characters, figures, etc. on the screen, a CRT driver 2 that controls the display on the CRTI, and commands, character strings, etc.
A keyboard 3 for inputting numerical values, etc.; a mouse 4, which is a pointing device for indicating and selecting icons, display areas, etc. displayed on the CRTI with a cursor;
A keyboard driver outputs various data by operating the keyboard 3 by the user, an external storage device 6 stores various files in a storage medium such as a fixed disk, and input/output of data from the external storage device 6. It is composed of an external storage device driver 7 to control, a main memory 8, a floppy disk drive unit 9, and a CPU (central processing unit) 10.

The main memory 8 stores a group of programs such as an operating program that manages the basic operations of this data processing device and various application programs, as well as data such as characters and numbers input from the keyboard 3 and mouse 4. ing. The main memory 8 also performs compression operations that package subdirectories and multiple files into one file, and converts packaged files managed as one file in a directory on a floppy disk into subdirectories and files. An operation is performed to decompose the file into multiple files.

The CPU10 is a circuit that controls the entire device and performs arithmetic processing on predetermined data based on various instructions, and reads a program from the main memory 8 that is connected to instructions from the keyboard 3 and mouse 4, and performs input. Execute arithmetic processing on the data. CPU10 also performs operations such as reading a subdirectory and multiple files into the main memory 8, packaging them into a single file, and writing them to a floppy disk, reading the packaged files from the floppy disk to the main memory 6, and writing them into the main memory 6. to break it down into subdirectories and multiple files.

FIG. 1 is an explanatory diagram schematically showing the arrangement of directories and files in a floppy disk and main memory.

In FIG. 1, a directory 21 for files stored on the floppy disk is placed at the beginning of the floppy disk, and all files on the floppy disk are managed by this directory 21. The directory 21 is composed of file record 1, file record 2 to file record n, and each file record has a file name, subordinate subdirectory, attribute, etc. written therein. Directory 21 of this example
File record 1 does not have a subordinate subdirectory, so file 1- is stored as one file in the floppy disk. Furthermore, the file record 2 has a subordinate subdirectory 22, but these subdirectories and the multiple files 2-1 to 2-n under their control are packaged files on the floppy disk. It is stored as 2.

When writing file data stored on a fixed disk device or other floppy disk to a floppy disk, the above-mentioned subdirectories and multiple files under their management are stored in the main memory 8 of the data processing device. After performing a compression operation within the floppy disk and batching it into a single file format, it is written as a single file (file 2 in this example) under the management of the directory 21 of the floppy disk. Also, when reading file 2 from the floppy disk, write 1 in directory 21.
One package managed as one file is read onto the main memory 8, the package is disassembled on the main memory 8, and the target file is read.

C when writing/reading the files mentioned above
The processing procedure of PU10 will be explained based on the flowcharts of FIGS. 3 and 4.

First, the processing procedure of the CPU 10 when writing a file will be explained with reference to the flowchart shown in FIG.

CPU10 determines whether the file to be written to the floppy disk is composed of a plurality of files (step 101). Here, if the file is composed of multiple files, the subdirectory that manages the multiple files and the multiple files are placed on the main memory (step 102), and compressed into one file. Package it into a format (Step 1
03). Then, the packaged file is written to the floppy disk (step 104).If the file is a single file in step 101, it is written as is to the floppy disk (step 104).

Next, the processing procedure of the CPU when reading a file stored on a floppy disk will be explained with reference to the flowchart shown in FIG.

CPU10 determines whether the file stored on the floppy disk is a packaged file (step 201). Here, if the file is a packaged file, the packaged file is placed on the main memory (step 202) and decomposed into subdirectories and multiple files (step 202).
03).

-Then, extract the target file from the disassembled files (step 204). Also, step 20
1, if the file is not a packaged file, extract the file (step 204).
).

According to the file management method of the above embodiment, files having a hierarchical book structure are managed in the main memory of the data processing device, so file data cannot be arranged continuously on the floppy disk. can simplify access to floppy disks.

〔Effect of the invention〕

As explained above, in the file management method according to the present invention, files stored in a floppy disk are managed in a set of directories, and when one file record has a subdirectory, the files stored in the floppy disk are managed in a set of directories. Since a plurality of files are packaged and stored as one file on a floppy disk, the files can be arranged relatively consecutively on the floppy disk. Therefore, access to the floppy disk is simplified and the mechanical load on the disk can be reduced, so data destruction due to a disk crash can be kept to a minimum.

Further, since only one set of directories is provided on the floppy disk, the storage area is not occupied by subordinate subdirectories, and therefore the storage area of the disk can be used effectively. Furthermore, for a floppy disk system that has only one set of directories, it is possible to realize a hierarchical book-structured file management system with only a few changes to the program.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram schematically showing the arrangement of directories and files on a floppy disk and in main memory.
FIG. 2 is a block diagram showing an example of a data processing device for implementing the file management method according to the present invention, FIG. 3 is a flowchart showing the processing procedure of the CPU when writing a file, and FIG. 4 is a file FIG. 5 is an explanatory diagram schematically showing a hierarchical tree structure within a floppy disk. 8... Main memory, 9... Floppy disk drive unit, 10... CPU (central processing unit), 1
1.21...Directory, 12.13.22...
subdirectory. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 Regarding files stored in a floppy disk
Set up a set of directories, and if one file record in the directory has a subdirectory, package the multiple files managed in that subdirectory with the subdirectory, and save them as one file on a floppy disk. A file management method for a floppy disk, characterized in that the packaged file stored on the floppy disk is placed in memory, and the target file is read by disassembling the package. Method.