JPH0447581A - File storing system for floppy disk - Google Patents

Abstract

PURPOSE:To install all the files suitable for applications in a short time by utilizing indexes on which the application of the file, a file name, and a storing position are registered. CONSTITUTION:A write means 3 writes the indexes on which the file name and the storing position of the file, and the application of the file are registered when they are written on a floppy disk 1 on an index storage area at the final part of the floppy disk 1. A read-in means 4 refers to the index in the index storage area placed at the final part of the floppy disk 1 when reading out the file from the floppy disk 1, and collates the application registered on a readout index, and obtains the storing position of the file that coincides with a purpose, and makes access the file. Thereby, it is possible to find out the file in a short time, and also, to perform readout by a conventional file storing system, and no interchangeability is impaired.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a floppy disk file storage system, and more particularly to a floppy disk file storage system that can speed up the reading of a target file.

[Conventional technology] Magnetic tape was initially used for computer operating systems and program inlets.
Since magnetic tape cannot be accessed randomly, files are stored one by one starting from the beginning of the magnetic tape, and information regarding the storage location of the files is not stored on the magnetic tape.

When floppy disks are used for installation purposes, a file storage method similar to that of magnetic tape is used. They were stored one by one.

In this conventional floppy disk file storage method, when reading only files used for a specific purpose and registering them in the computer system's magnetic disk drive, the first file on the floppy disk is used to find the file to be read. The system reads files sequentially until the end of the file, and when the file to be read is encountered, that file is read.

Problems to be Solved by the Invention In the conventional floppy disk file storage method described above, the file to be read is searched for in order from the file stored at the beginning of the floppy disk. When a plurality of files are to be used, the disadvantages are that the names of the target files must be given one by one, and that depending on the location of the file to be read, it takes time to read successive files.

The present invention has been made in order to eliminate the above-mentioned drawbacks inherent in the conventional technology. Therefore, an object of the present invention is to identify the intended use of files, file names, and storage locations in order to discover files in a short time. In addition to using an index to register files, files can be read from a floppy disk on which files have been written using the floppy disk file storage method of the present invention even in a computer system that supports continuous storage using the conventional floppy disk file storage method. The purpose of this invention is to provide a new file storage method for floppy disks that takes compatibility into account.

Means for Solving the Problems In order to achieve the above object, the floppy disk file storage method according to the present invention uses an index that registers the file name, storage location, and file usage when writing files to the floppy disk. When reading a file from a floppy disk, refer to the index of the index storage area placed at the end of the floppy disk and check the purpose registered in the read index. and reading means for accessing the file by obtaining the storage location of the file that matches the purpose.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a floppy disk file storage system according to the present invention.

Referring to FIG. 1, one embodiment of the floppy disk file storage method according to the present invention includes a floppy disk device 2 containing a floppy disk 1, and a writing means for an operating system of a computer to which the floppy disk device 2 is connected. 3 and a disk input/output processing program 5 having a reading means 4.

FIG. 2 is a conceptual diagram of a floppy disk 1 on which files are written and read using the floppy disk file storage method according to the present invention.

Referring to FIG. 2, this floppy disk 1 has a file storage area from the Nth cylinder to the Nth cylinder.
1, and the index storage area 12 is from the N+1th cylinder to the Nth cylinder.

FIG. 3 is a diagram showing the format of files stored in the file storage area 11.

In FIG. 3, a file is composed of a file header 13 that occupies a fixed number of sectors and a file entity 14 that occupies an undefined number of sectors. The file header 13 is
Stores information such as the file name and size of the file. In the file storage area 11, files in the format shown in FIG. 3 are stored in order from the beginning.

FIG. 4 is a diagram showing the format of the index stored in the index storage area 12.

Referring to FIG. 4, the index is indicated by a fixed-length file name field 15 that stores the file name of the file stored in the file storage area 11, and the file name stored in the file name field 15. It consists of a fixed-length address field 16 that stores the storage position of the file in the file storage area 11 (the starting position of the file header 13), and a field 17 that indicates the intended use of the file. In the index storage area 12, indexes in the format shown in FIG. 4 are stored in order from the beginning.

FIG. 5 is a flowchart showing the processing flow of the writing means 3.

FIG. 6 is a flowchart showing the processing flow of the reading means 4.

Next, the operation of this embodiment will be explained. First, writing will be explained with reference to FIG. Here, a case will be explained in which a file A is written to an empty floppy disk 1 as shown in FIG.

5 and 7, when writing the file A to the floppy disk 1, the writing means 3 writes the file storage location (in this case, the file storage location) on the floppy disk 1 to create the index 73. Area 11
) is taken in and stored (process 31).

Next, write to file A from the memorized storage location.
Write the file name etc. as the file header 71 (
Processing 32), 11! file header 7 written
1, the file entity 72 of the file A to be written is written (process 33).

Next, the writing means 3 sets the file storage position to the file entity 72 of the file A in preparation for writing the next file.
(processing 34).

Next, the index 73 corresponding to the written file A is written in the index storage area 12 (process 35), and the file name, storage location, and usage of the file A are registered in the index.

Finally, to indicate that the index of file A is the final index, the next index is written as a null index 74 (process 36).

Second, reading will be explained with reference to FIG. Here, the case shown in FIG. 8 will be explained as an example.

FIG. 8 is a conceptual diagram showing a floppy disk 1 that stores files to be read. K files are registered on this floppy disk 1, and correspondingly, indexes 81 to 82 are registered, and the K+1st index is a null index 83, which is the final index. It shows.

Referring to FIGS. 6 and 8, when reading a file from the floppy disk 1, the reading means 4 performs a process of reading out the indexes in the index storage area 12 one by one starting from the first index 81. 41).

Next, the read index is null index 83
It is determined whether or not (processing 42), and the null index 8
If it is not 3, it is checked and determined whether the usage to be read matches the usage usage field 17 of the index (process 43). If the given usage and the usage of the index do not match, Control is returned to process 41, the next index is read, and processes 42 and 43 are performed.

If the usage matches, the reading means 4 accesses the file based on the storage location of the file stored in the matched index and reads the file 44)
, ends the process.

If it is determined in process 42 that the index is a null index 83, the process ends at that point.

As described in detail, according to the present invention, by using an index that registers the intended use of a file, the file name, and the storage location, the file name of the file that matches the intended use is given and the file name is used. The effect is that all files suitable for the purpose can be installed in a short time without searching. In particular, this effect is considered to be more obvious when a large number of files are registered, such as on a large-capacity floppy disk.

Further, according to the present invention, by storing the index in the last area of the floppy disk,
A floppy disk in which files are stored using the floppy disk file storage method of the present invention can also be read using the conventional floppy disk file storage method, resulting in the effect that compatibility is not compromised.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a floppy disk file storage system according to the present invention. DESCRIPTION OF SYMBOLS 1...Floppy disk, 2...Floppy disk device, 3...Writing means, 4...Reading means, 5...Disk input/output processing program FIG. 2 shows the file of the floppy disk according to the present invention. FIG. 2 is a conceptual diagram showing a floppy disk on which files are written and read using a storage method. 11... File storage area, 12... Index storage area FIG. 3 is a diagram showing the format of files stored in the file storage area of the floppy disk. 13...File header, 14...File entity FIG. 4 is a diagram showing the format of the index stored in the index storage area of the floppy disk. 15...File name field, 16...Address field, 17...Usage field FIG. 5 is a flowchart showing the writing process. Process 31: Importing file storage location, Process 32
...Write file header, Process 33...Write file entity, Process 34...Update file storage position, Process 35...Write index, Process 36...Write null index FIG. is a flowchart showing the reading process. Process 41... Index reading, Process 42...
・Determination of null index, processing 43...Determination of purpose of use, processing 44...File reading Figure 7 shows the second
FIG. 3 is a conceptual diagram showing an image when writing a file to the floppy disk shown in the figure. 71... File header, 72... File entity,
73...Index, 74...Null index FIG. 8 is a conceptual diagram showing the state of writing files to the floppy disk of FIG. 2. 81.22... Index, 83... Null index Figure Figure Figure Figure

Claims (1)

[Claims] A method for writing an index for registering the file name, storage location, and file usage of a file to the index storage area at the end of the floppy disk when writing a file to the floppy disk, and a method for writing an index to the index storage area at the end of the floppy disk when reading a file from the floppy disk. reading means for accessing the file by referring to the index of the index storage area placed in the storage area, collating the purpose registered in the reading index, obtaining the storage position of the file that matches the purpose. Floppy disk file storage method.