JPH03278144A - Managing system for file in magnetic tape - Google Patents

Abstract

PURPOSE:To fetch the file information stored in a magnetic tape in a short time by providing a file management file in the magnetic tape. CONSTITUTION:The system is constituted of a file management file 1 placed in the head position of a magnetic tape. a temporary storage area 3 placed in a main storage of a computer 4 for managing file information only while the magnetic tape is set to a reader, and a control program 2 of the computer 4 for controlling an exchange of the file information. Also, the file management file 1 for managing in a lump all the file information in the magnetic tape is provided in the head position of the magnetic tape, and also, at the time of data processing, the contents of the file management file 1 are expanded temporarily. In such a way, the file information stored in the magnetic tape can be fetched in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic tape file management system, and more particularly to a magnetic tape file management system for managing files stored on a magnetic tape medium [prior art] ] Conventional magnetic tape file management methods do not collectively manage the information of each file stored on the magnetic tape medium, but instead read and examine the storage contents of each file individually to achieve the intended purpose. It is determined whether or not the file has the file information that corresponds to 5.

[Problem to be solved by the invention]

In the conventional magnetic tape file management method described above, in order to obtain the desired file information within the magnetic tape medium, the file information scattered within the magnetic tape medium must be read and examined one after another. However, this method has the disadvantage that it takes too much time to find and extract the desired file information.

[Means to solve the problem]

The in-magnetic tape file management method of the present invention has a file management file that collectively manages all file information in the magnetic tape at the beginning of the magnetic tape, and temporarily stores the file management file during data processing. It is configured with a storage area for expanding the contents.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the magnetic tape file management system of the present invention.

1 is a file management file located at the beginning of the magnetic tape, and 3 is a computer 4 for managing file information only while the magnetic tape is being hung on the reader.
It is a temporary storage area in the main memory of .

Furthermore, the control program 2 of the computer 4 controls the exchange of file information between the computers 1 and 3.

FIG. 2 is a flowchart showing an example of the operation of the control program 2. As shown in FIG.

As shown in FIG. 2, in step 21, a magnetic tape is loaded, and in step 22, file information at the leading position of the magnetic tape is read into a temporary storage device.

Then, in step 23, it is determined whether there is a request to display the file information, and if there is a display request, in step 24, the contents of the -time storage area are displayed on the external display device. This allows the operator to find out the presence or absence of target file information.

In addition, in step 25, normal input/output processing for the magnetic tape is performed, in step 26 it is determined whether or not it is necessary to update the file information by processing executed by the operator, and in step 27, the file information Update processing is in progress.

Then, in step 28, when all the processing for the magnetic tape is completed, in step 29, if the file information has been updated, the contents of the storage area are transferred to the file management file 1 at the beginning of the magnetic tape. I am writing to.

FIG. 3 is an explanatory diagram showing three examples of magnetic tape update processing.

FIG. 3(a) shows the process of initializing the magnetic tape,
File 1. An example is shown in which all information in file 2 is deleted.

Further, FIG. 3(b) shows file 2. This is an example in which the information in file 3 is no longer needed and is changed to a new file, and file 2. After deleting the information in file 3, it was changed to new information.

Furthermore, FIG. 3(C) is an example in which a new file is added while the current files 1 and 2 are left as they are, and new information is added later.

〔Effect of the invention〕

As explained above, the in-magnetic tape file management method of the present invention has the effect that file information stored in the magnetic tape can be retrieved in an extremely short time by having an in-magnetic tape file management file. have.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the magnetic tape file management method of the present invention, FIG. 2 is a flowchart showing an example of the operation of the control program 2, and FIGS. FIG. 2 is an explanatory diagram showing two examples. DESCRIPTION OF SYMBOLS 1...File management file, 2...Control program, 3...-time storage area, 4...Computer.

Claims (1)

[Claims] A file management file for collectively managing all file information on the magnetic tape is provided at the beginning of the magnetic tape, and a temporary storage area is provided for temporarily expanding the contents of the file management file during data processing. A magnetic tape file management method characterized by: